diff --git a/lab/Z.ExtensionMethods.Lab/Form1.cs b/lab/Z.ExtensionMethods.Lab/Form1.cs
index cd832912..34419fd1 100644
--- a/lab/Z.ExtensionMethods.Lab/Form1.cs
+++ b/lab/Z.ExtensionMethods.Lab/Form1.cs
@@ -157,25 +157,18 @@ public partial class Form1 : Form
         public Form1()
         {
             InitializeComponent();
+            object x1 = null;
 
-            var aaaa = (Attribute)null;
-    
-            StringBuilder sb = new StringBuilder("0123456789");
-            var b4 = "abc".Substring(1, 4);
-            char ch = '\'';
-            char ch2 = '"';
-            string tag = "a<b class='to>to'>c</b>d";
-            string tag2 = tag.StripHtml();
-            var a = new[] {"a", "b", "c"};
-            var b = new[] {"c", "d"};
-
-            using (var command = new SqlCommand())
-            {
-               // command.ExecuteDataSet();
-            }
+            var r1 = x1.ToInt32OrDefault(4);
+            var r2 = x1.ToInt32OrDefault(4, true);
+
+            //using (var command = new SqlCommand())
+            //{
+            //   // command.ExecuteDataSet();
+            //}
 
-            var c = new List<String[]> {a, b};
-            IEnumerable<string> d = c.MergeInnerEnumerable();
+            //var c = new List<String[]> {a, b};
+            //IEnumerable<string> d = c.MergeInnerEnumerable();
         }
 
         public void Misc()
diff --git a/lab/Z.ExtensionMethods.Lab/Z.ExtensionMethods.Lab.csproj b/lab/Z.ExtensionMethods.Lab/Z.ExtensionMethods.Lab.csproj
index 14db5750..f1b7a742 100644
--- a/lab/Z.ExtensionMethods.Lab/Z.ExtensionMethods.Lab.csproj
+++ b/lab/Z.ExtensionMethods.Lab/Z.ExtensionMethods.Lab.csproj
@@ -50,9 +50,6 @@
     <Reference Include="System.Drawing" />
     <Reference Include="System.Windows.Forms" />
     <Reference Include="System.Xml" />
-    <Reference Include="Z.ExtensionMethods.WithNamespace">
-      <HintPath>..\..\..\..\..\..\OneDrive\Documents\Release\Z.ExtensionMethods\Z.ExtensionMethods.WithNamespace\NET40\Z.ExtensionMethods.WithNamespace.dll</HintPath>
-    </Reference>
   </ItemGroup>
   <ItemGroup>
     <Compile Include="Form1.cs">
@@ -86,6 +83,10 @@
     </Compile>
   </ItemGroup>
   <ItemGroup>
+    <ProjectReference Include="..\..\src\Z.Core\Z.Core.csproj">
+      <Project>{02f009f8-720b-4cbd-98ff-f2c33f4441d5}</Project>
+      <Name>Z.Core</Name>
+    </ProjectReference>
     <ProjectReference Include="..\..\src\Z.Data.SQLite\Z.Data.SQLite.csproj">
       <Project>{40cec7db-c8e6-4a24-8de7-9e0edf8708c6}</Project>
       <Name>Z.Data.SQLite</Name>
diff --git a/src/Z.Core/System.Object/Convert/ToValueType/Object.ToBooleanOrDefault.cs b/src/Z.Core/System.Object/Convert/ToValueType/Object.ToBooleanOrDefault.cs
index 211d1a06..fb1bb9cc 100644
--- a/src/Z.Core/System.Object/Convert/ToValueType/Object.ToBooleanOrDefault.cs
+++ b/src/Z.Core/System.Object/Convert/ToValueType/Object.ToBooleanOrDefault.cs
@@ -42,6 +42,29 @@ public static bool ToBooleanOrDefault(this object @this, bool defaultValue)
             return defaultValue;
         }
     }
+    /// <summary>
+    /// An object extension method that converts this object to a boolean or default.
+    /// </summary>
+    /// <param name="this">The @this to act on.</param>
+    /// <param name="defaultValue">true to default value.</param>
+    /// <param name="useDefaultIfNull">true to use default if null.</param>
+    /// <returns>The given data converted to a bool.</returns>
+    public static bool ToBooleanOrDefault(this object @this, bool defaultValue, bool useDefaultIfNull)
+    {
+        if (useDefaultIfNull && @this == null)
+        {
+            return defaultValue;
+        }
+
+        try
+        {
+            return Convert.ToBoolean(@this);
+        }
+        catch (Exception)
+        {
+            return defaultValue;
+        }
+    }
 
     /// <summary>
     ///     An object extension method that converts this object to a boolean or default.
@@ -60,4 +83,28 @@ public static bool ToBooleanOrDefault(this object @this, Func<bool> defaultValue
             return defaultValueFactory();
         }
     }
+
+    /// <summary>
+    /// An object extension method that converts this object to a boolean or default.
+    /// </summary>
+    /// <param name="this">The @this to act on.</param>
+    /// <param name="defaultValueFactory">The default value factory.</param>
+    /// <param name="useDefaultIfNull">true to use default if null.</param>
+    /// <returns>The given data converted to a bool.</returns>
+    public static bool ToBooleanOrDefault(this object @this, Func<bool> defaultValueFactory, bool useDefaultIfNull)
+    {
+        if (useDefaultIfNull && @this == null)
+        {
+            return defaultValueFactory();
+        }
+
+        try
+        {
+            return Convert.ToBoolean(@this);
+        }
+        catch (Exception)
+        {
+            return defaultValueFactory();
+        }
+    }
 }
\ No newline at end of file
diff --git a/src/Z.Core/System.Object/Convert/ToValueType/Object.ToByteOrDefault.cs b/src/Z.Core/System.Object/Convert/ToValueType/Object.ToByteOrDefault.cs
index 9dc2e2c3..aae795d2 100644
--- a/src/Z.Core/System.Object/Convert/ToValueType/Object.ToByteOrDefault.cs
+++ b/src/Z.Core/System.Object/Convert/ToValueType/Object.ToByteOrDefault.cs
@@ -43,6 +43,28 @@ public static byte ToByteOrDefault(this object @this, byte defaultValue)
         }
     }
 
+    /// <summary>An object extension method that converts this object to a byte or default.</summary>
+    /// <param name="this">The @this to act on.</param>
+    /// <param name="defaultValue">The default value.</param>
+    /// <param name="useDefaultIfNull">true to use default if null.</param>
+    /// <returns>The given data converted to a byte.</returns>
+    public static byte ToByteOrDefault(this object @this, byte defaultValue, bool useDefaultIfNull)
+    {
+        if (useDefaultIfNull && @this == null)
+        {
+            return defaultValue;
+        }
+
+        try
+        {
+            return Convert.ToByte(@this);
+        }
+        catch (Exception)
+        {
+            return defaultValue;
+        }
+    }
+
     /// <summary>
     ///     An object extension method that converts this object to a byte or default.
     /// </summary>
@@ -60,4 +82,26 @@ public static byte ToByteOrDefault(this object @this, Func<byte> defaultValueFac
             return defaultValueFactory();
         }
     }
+
+    /// <summary>An object extension method that converts this object to a byte or default.</summary>
+    /// <param name="this">The @this to act on.</param>
+    /// <param name="defaultValueFactory">The default value factory.</param>
+    /// <param name="useDefaultIfNull">true to use default if null.</param>
+    /// <returns>The given data converted to a byte.</returns>
+    public static byte ToByteOrDefault(this object @this, Func<byte> defaultValueFactory, bool useDefaultIfNull)
+    {
+        if (useDefaultIfNull && @this == null)
+        {
+            return defaultValueFactory();
+        }
+
+        try
+        {
+            return Convert.ToByte(@this);
+        }
+        catch (Exception)
+        {
+            return defaultValueFactory();
+        }
+    }
 }
\ No newline at end of file
diff --git a/src/Z.Core/System.Object/Convert/ToValueType/Object.ToCharOrDefault.cs b/src/Z.Core/System.Object/Convert/ToValueType/Object.ToCharOrDefault.cs
index cfbfdf19..9f5bf259 100644
--- a/src/Z.Core/System.Object/Convert/ToValueType/Object.ToCharOrDefault.cs
+++ b/src/Z.Core/System.Object/Convert/ToValueType/Object.ToCharOrDefault.cs
@@ -43,6 +43,30 @@ public static char ToCharOrDefault(this object @this, char defaultValue)
         }
     }
 
+    /// <summary>
+    /// An object extension method that converts this object to a character or default.
+    /// </summary>
+    /// <param name="this">The @this to act on.</param>
+    /// <param name="defaultValue">The default value.</param>
+    /// <param name="useDefaultIfNull">true to use default if null.</param>
+    /// <returns>The given data converted to a char.</returns>
+    public static char ToCharOrDefault(this object @this, char defaultValue, bool useDefaultIfNull)
+    {
+        if (useDefaultIfNull && @this == null)
+        {
+            return defaultValue;
+        }
+
+        try
+        {
+            return Convert.ToChar(@this);
+        }
+        catch (Exception)
+        {
+            return defaultValue;
+        }
+    }
+
     /// <summary>
     ///     An object extension method that converts this object to a character or default.
     /// </summary>
@@ -60,4 +84,28 @@ public static char ToCharOrDefault(this object @this, Func<char> defaultValueFac
             return defaultValueFactory();
         }
     }
+
+    /// <summary>
+    /// An object extension method that converts this object to a character or default.
+    /// </summary>
+    /// <param name="this">The @this to act on.</param>
+    /// <param name="defaultValueFactory">The default value factory.</param>
+    /// <param name="useDefaultIfNull">true to use default if null.</param>
+    /// <returns>The given data converted to a char.</returns>
+    public static char ToCharOrDefault(this object @this, Func<char> defaultValueFactory, bool useDefaultIfNull)
+    {
+        if (useDefaultIfNull && @this == null)
+        {
+            return defaultValueFactory();
+        }
+
+        try
+        {
+            return Convert.ToChar(@this);
+        }
+        catch (Exception)
+        {
+            return defaultValueFactory();
+        }
+    }
 }
\ No newline at end of file
diff --git a/src/Z.Core/System.Object/Convert/ToValueType/Object.ToDateTimeOffSetOrDefault.cs b/src/Z.Core/System.Object/Convert/ToValueType/Object.ToDateTimeOffSetOrDefault.cs
index c0dfd821..bd726f22 100644
--- a/src/Z.Core/System.Object/Convert/ToValueType/Object.ToDateTimeOffSetOrDefault.cs
+++ b/src/Z.Core/System.Object/Convert/ToValueType/Object.ToDateTimeOffSetOrDefault.cs
@@ -43,6 +43,30 @@ public static DateTimeOffset ToDateTimeOffSetOrDefault(this object @this, DateTi
         }
     }
 
+    /// <summary>
+    /// An object extension method that converts this object to a date time off set or default.
+    /// </summary>
+    /// <param name="this">The @this to act on.</param>
+    /// <param name="defaultValue">The default value.</param>
+    /// <param name="useDefaultIfNull">true to use default if null.</param>
+    /// <returns>The given data converted to a DateTimeOffset.</returns>
+    public static DateTimeOffset ToDateTimeOffSetOrDefault(this object @this, DateTimeOffset defaultValue, bool useDefaultIfNull)
+    {
+        if (useDefaultIfNull && @this == null)
+        {
+            return defaultValue;
+        }
+
+        try
+        {
+            return new DateTimeOffset(Convert.ToDateTime(@this), TimeSpan.Zero);
+        }
+        catch (Exception)
+        {
+            return defaultValue;
+        }
+    }
+
     /// <summary>
     ///     An object extension method that converts this object to a date time off set or default.
     /// </summary>
@@ -60,4 +84,28 @@ public static DateTimeOffset ToDateTimeOffSetOrDefault(this object @this, Func<D
             return defaultValueFactory();
         }
     }
+
+    /// <summary>
+    /// An object extension method that converts this object to a date time off set or default.
+    /// </summary>
+    /// <param name="this">The @this to act on.</param>
+    /// <param name="defaultValueFactory">The default value factory.</param>
+    /// <param name="useDefaultIfNull">true to use default if null.</param>
+    /// <returns>The given data converted to a DateTimeOffset.</returns>
+    public static DateTimeOffset ToDateTimeOffSetOrDefault(this object @this, Func<DateTimeOffset> defaultValueFactory, bool useDefaultIfNull)
+    {
+        if (useDefaultIfNull && @this == null)
+        {
+            return defaultValueFactory();
+        }
+
+        try
+        {
+            return new DateTimeOffset(Convert.ToDateTime(@this), TimeSpan.Zero);
+        }
+        catch (Exception)
+        {
+            return defaultValueFactory();
+        }
+    }
 }
\ No newline at end of file
diff --git a/src/Z.Core/System.Object/Convert/ToValueType/Object.ToDateTimeOrDefault.cs b/src/Z.Core/System.Object/Convert/ToValueType/Object.ToDateTimeOrDefault.cs
index a02c1acf..8714d3cd 100644
--- a/src/Z.Core/System.Object/Convert/ToValueType/Object.ToDateTimeOrDefault.cs
+++ b/src/Z.Core/System.Object/Convert/ToValueType/Object.ToDateTimeOrDefault.cs
@@ -43,6 +43,30 @@ public static DateTime ToDateTimeOrDefault(this object @this, DateTime defaultVa
         }
     }
 
+    /// <summary>
+    /// An object extension method that converts this object to a date time or default.
+    /// </summary>
+    /// <param name="this">The @this to act on.</param>
+    /// <param name="defaultValue">The default value.</param>
+    /// <param name="useDefaultIfNull">true to use default if null.</param>
+    /// <returns>The given data converted to a DateTime.</returns>
+    public static DateTime ToDateTimeOrDefault(this object @this, DateTime defaultValue, bool useDefaultIfNull)
+    {
+        if (useDefaultIfNull && @this == null)
+        {
+            return defaultValue;
+        }
+
+        try
+        {
+            return Convert.ToDateTime(@this);
+        }
+        catch (Exception)
+        {
+            return defaultValue;
+        }
+    }
+
     /// <summary>
     ///     An object extension method that converts this object to a date time or default.
     /// </summary>
@@ -60,4 +84,28 @@ public static DateTime ToDateTimeOrDefault(this object @this, Func<DateTime> def
             return defaultValueFactory();
         }
     }
+
+    /// <summary>
+    /// An object extension method that converts this object to a date time or default.
+    /// </summary>
+    /// <param name="this">The @this to act on.</param>
+    /// <param name="defaultValueFactory">The default value factory.</param>
+    /// <param name="useDefaultIfNull">true to use default if null.</param>
+    /// <returns>The given data converted to a DateTime.</returns>
+    public static DateTime ToDateTimeOrDefault(this object @this, Func<DateTime> defaultValueFactory, bool useDefaultIfNull)
+    {
+        if (useDefaultIfNull && @this == null)
+        {
+            return defaultValueFactory();
+        }
+
+        try
+        {
+            return Convert.ToDateTime(@this);
+        }
+        catch (Exception)
+        {
+            return defaultValueFactory();
+        }
+    }
 }
\ No newline at end of file
diff --git a/src/Z.Core/System.Object/Convert/ToValueType/Object.ToDecimalOrDefault.cs b/src/Z.Core/System.Object/Convert/ToValueType/Object.ToDecimalOrDefault.cs
index c5e7e014..f73b0742 100644
--- a/src/Z.Core/System.Object/Convert/ToValueType/Object.ToDecimalOrDefault.cs
+++ b/src/Z.Core/System.Object/Convert/ToValueType/Object.ToDecimalOrDefault.cs
@@ -43,6 +43,30 @@ public static decimal ToDecimalOrDefault(this object @this, decimal defaultValue
         }
     }
 
+    /// <summary>
+    /// An object extension method that converts this object to a decimal or default.
+    /// </summary>
+    /// <param name="this">The @this to act on.</param>
+    /// <param name="defaultValue">The default value.</param>
+    /// <param name="useDefaultIfNull">true to use default if null.</param>
+    /// <returns>The given data converted to a decimal.</returns>
+    public static decimal ToDecimalOrDefault(this object @this, decimal defaultValue, bool useDefaultIfNull)
+    {
+        if (useDefaultIfNull && @this == null)
+        {
+            return defaultValue;
+        }
+
+        try
+        {
+            return Convert.ToDecimal(@this);
+        }
+        catch (Exception)
+        {
+            return defaultValue;
+        }
+    }
+
     /// <summary>
     ///     An object extension method that converts this object to a decimal or default.
     /// </summary>
@@ -60,4 +84,28 @@ public static decimal ToDecimalOrDefault(this object @this, Func<decimal> defaul
             return defaultValueFactory();
         }
     }
+
+    /// <summary>
+    /// An object extension method that converts this object to a decimal or default.
+    /// </summary>
+    /// <param name="this">The @this to act on.</param>
+    /// <param name="defaultValueFactory">The default value factory.</param>
+    /// <param name="useDefaultIfNull">true to use default if null.</param>
+    /// <returns>The given data converted to a decimal.</returns>
+    public static decimal ToDecimalOrDefault(this object @this, Func<decimal> defaultValueFactory, bool useDefaultIfNull)
+    {
+        if (useDefaultIfNull && @this == null)
+        {
+            return defaultValueFactory();
+        }
+
+        try
+        {
+            return Convert.ToDecimal(@this);
+        }
+        catch (Exception)
+        {
+            return defaultValueFactory();
+        }
+    }
 }
\ No newline at end of file
diff --git a/src/Z.Core/System.Object/Convert/ToValueType/Object.ToDoubleOrDefault.cs b/src/Z.Core/System.Object/Convert/ToValueType/Object.ToDoubleOrDefault.cs
index 543eb83c..ad2ca813 100644
--- a/src/Z.Core/System.Object/Convert/ToValueType/Object.ToDoubleOrDefault.cs
+++ b/src/Z.Core/System.Object/Convert/ToValueType/Object.ToDoubleOrDefault.cs
@@ -43,6 +43,30 @@ public static double ToDoubleOrDefault(this object @this, double defaultValue)
         }
     }
 
+    /// <summary>
+    /// An object extension method that converts this object to a double or default.
+    /// </summary>
+    /// <param name="this">The @this to act on.</param>
+    /// <param name="defaultValue">The default value.</param>
+    /// <param name="useDefaultIfNull">true to use default if null.</param>
+    /// <returns>The given data converted to a double.</returns>
+    public static double ToDoubleOrDefault(this object @this, double defaultValue, bool useDefaultIfNull)
+    {
+        if (useDefaultIfNull && @this == null)
+        {
+            return defaultValue;
+        }
+
+        try
+        {
+            return Convert.ToDouble(@this);
+        }
+        catch (Exception)
+        {
+            return defaultValue;
+        }
+    }
+
     /// <summary>
     ///     An object extension method that converts this object to a double or default.
     /// </summary>
@@ -60,4 +84,28 @@ public static double ToDoubleOrDefault(this object @this, Func<double> defaultVa
             return defaultValueFactory();
         }
     }
+
+    /// <summary>
+    /// An object extension method that converts this object to a double or default.
+    /// </summary>
+    /// <param name="this">The @this to act on.</param>
+    /// <param name="defaultValueFactory">The default value factory.</param>
+    /// <param name="useDefaultIfNull">true to use default if null.</param>
+    /// <returns>The given data converted to a double.</returns>
+    public static double ToDoubleOrDefault(this object @this, Func<double> defaultValueFactory, bool useDefaultIfNull)
+    {
+        if (useDefaultIfNull && @this == null)
+        {
+            return defaultValueFactory();
+        }
+
+        try
+        {
+            return Convert.ToDouble(@this);
+        }
+        catch (Exception)
+        {
+            return defaultValueFactory();
+        }
+    }
 }
\ No newline at end of file
diff --git a/src/Z.Core/System.Object/Convert/ToValueType/Object.ToFloatOrDefault.cs b/src/Z.Core/System.Object/Convert/ToValueType/Object.ToFloatOrDefault.cs
index 2a0c7656..c6160bd4 100644
--- a/src/Z.Core/System.Object/Convert/ToValueType/Object.ToFloatOrDefault.cs
+++ b/src/Z.Core/System.Object/Convert/ToValueType/Object.ToFloatOrDefault.cs
@@ -43,6 +43,30 @@ public static float ToFloatOrDefault(this object @this, float defaultValue)
         }
     }
 
+    /// <summary>
+    /// An object extension method that converts this object to a float or default.
+    /// </summary>
+    /// <param name="this">The @this to act on.</param>
+    /// <param name="defaultValue">The default value.</param>
+    /// <param name="useDefaultIfNull">true to use default if null.</param>
+    /// <returns>The given data converted to a float.</returns>
+    public static float ToFloatOrDefault(this object @this, float defaultValue, bool useDefaultIfNull)
+    {
+        if (useDefaultIfNull && @this == null)
+        {
+            return defaultValue;
+        }
+
+        try
+        {
+            return Convert.ToSingle(@this);
+        }
+        catch (Exception)
+        {
+            return defaultValue;
+        }
+    }
+
     /// <summary>
     ///     An object extension method that converts this object to a float or default.
     /// </summary>
@@ -60,4 +84,28 @@ public static float ToFloatOrDefault(this object @this, Func<float> defaultValue
             return defaultValueFactory();
         }
     }
+
+    /// <summary>
+    /// An object extension method that converts this object to a float or default.
+    /// </summary>
+    /// <param name="this">The @this to act on.</param>
+    /// <param name="defaultValueFactory">The default value factory.</param>
+    /// <param name="useDefaultIfNull">true to use default if null.</param>
+    /// <returns>The given data converted to a float.</returns>
+    public static float ToFloatOrDefault(this object @this, Func<float> defaultValueFactory, bool useDefaultIfNull)
+    {
+        if (useDefaultIfNull && @this == null)
+        {
+            return defaultValueFactory();
+        }
+
+        try
+        {
+            return Convert.ToSingle(@this);
+        }
+        catch (Exception)
+        {
+            return defaultValueFactory();
+        }
+    }
 }
\ No newline at end of file
diff --git a/src/Z.Core/System.Object/Convert/ToValueType/Object.ToGuidOrDefault.cs b/src/Z.Core/System.Object/Convert/ToValueType/Object.ToGuidOrDefault.cs
index 763ac9b0..69321da9 100644
--- a/src/Z.Core/System.Object/Convert/ToValueType/Object.ToGuidOrDefault.cs
+++ b/src/Z.Core/System.Object/Convert/ToValueType/Object.ToGuidOrDefault.cs
@@ -43,6 +43,30 @@ public static Guid ToGuidOrDefault(this object @this, Guid defaultValue)
         }
     }
 
+    /// <summary>
+    /// An object extension method that converts this object to a unique identifier or default.
+    /// </summary>
+    /// <param name="this">The @this to act on.</param>
+    /// <param name="defaultValue">The default value.</param>
+    /// <param name="useDefaultIfNull">true to use default if null.</param>
+    /// <returns>The given data converted to a GUID.</returns>
+    public static Guid ToGuidOrDefault(this object @this, Guid defaultValue, bool useDefaultIfNull)
+    {
+        if (useDefaultIfNull && @this == null)
+        {
+            return defaultValue;
+        }
+
+        try
+        {
+            return new Guid(@this.ToString());
+        }
+        catch (Exception)
+        {
+            return defaultValue;
+        }
+    }
+
     /// <summary>
     ///     An object extension method that converts this object to a unique identifier or default.
     /// </summary>
@@ -60,4 +84,28 @@ public static Guid ToGuidOrDefault(this object @this, Func<Guid> defaultValueFac
             return defaultValueFactory();
         }
     }
+
+    /// <summary>
+    /// An object extension method that converts this object to a unique identifier or default.
+    /// </summary>
+    /// <param name="this">The @this to act on.</param>
+    /// <param name="defaultValueFactory">The default value factory.</param>
+    /// <param name="useDefaultIfNull">true to use default if null.</param>
+    /// <returns>The given data converted to a GUID.</returns>
+    public static Guid ToGuidOrDefault(this object @this, Func<Guid> defaultValueFactory, bool useDefaultIfNull)
+    {
+        if (useDefaultIfNull && @this == null)
+        {
+            return defaultValueFactory();
+        }
+
+        try
+        {
+            return new Guid(@this.ToString());
+        }
+        catch (Exception)
+        {
+            return defaultValueFactory();
+        }
+    }
 }
\ No newline at end of file
diff --git a/src/Z.Core/System.Object/Convert/ToValueType/Object.ToInt16OrDefault.cs b/src/Z.Core/System.Object/Convert/ToValueType/Object.ToInt16OrDefault.cs
index 10d3ca44..3fd486eb 100644
--- a/src/Z.Core/System.Object/Convert/ToValueType/Object.ToInt16OrDefault.cs
+++ b/src/Z.Core/System.Object/Convert/ToValueType/Object.ToInt16OrDefault.cs
@@ -43,6 +43,30 @@ public static short ToInt16OrDefault(this object @this, short defaultValue)
         }
     }
 
+    /// <summary>
+    /// An object extension method that converts this object to an int 16 or default.
+    /// </summary>
+    /// <param name="this">The @this to act on.</param>
+    /// <param name="defaultValue">The default value.</param>
+    /// <param name="useDefaultIfNull">true to use default if null.</param>
+    /// <returns>The given data converted to a short.</returns>
+    public static short ToInt16OrDefault(this object @this, short defaultValue, bool useDefaultIfNull)
+    {
+        if (useDefaultIfNull && @this == null)
+        {
+            return defaultValue;
+        }
+
+        try
+        {
+            return Convert.ToInt16(@this);
+        }
+        catch (Exception)
+        {
+            return defaultValue;
+        }
+    }
+
     /// <summary>
     ///     An object extension method that converts this object to an int 16 or default.
     /// </summary>
@@ -60,4 +84,28 @@ public static short ToInt16OrDefault(this object @this, Func<short> defaultValue
             return defaultValueFactory();
         }
     }
+
+    /// <summary>
+    /// An object extension method that converts this object to an int 16 or default.
+    /// </summary>
+    /// <param name="this">The @this to act on.</param>
+    /// <param name="defaultValueFactory">The default value factory.</param>
+    /// <param name="useDefaultIfNull">true to use default if null.</param>
+    /// <returns>The given data converted to a short.</returns>
+    public static short ToInt16OrDefault(this object @this, Func<short> defaultValueFactory, bool useDefaultIfNull)
+    {
+        if (useDefaultIfNull && @this == null)
+        {
+            return defaultValueFactory();
+        }
+
+        try
+        {
+            return Convert.ToInt16(@this);
+        }
+        catch (Exception)
+        {
+            return defaultValueFactory();
+        }
+    }
 }
\ No newline at end of file
diff --git a/src/Z.Core/System.Object/Convert/ToValueType/Object.ToInt32OrDefault.cs b/src/Z.Core/System.Object/Convert/ToValueType/Object.ToInt32OrDefault.cs
index 62519158..2e4ed46a 100644
--- a/src/Z.Core/System.Object/Convert/ToValueType/Object.ToInt32OrDefault.cs
+++ b/src/Z.Core/System.Object/Convert/ToValueType/Object.ToInt32OrDefault.cs
@@ -43,6 +43,30 @@ public static int ToInt32OrDefault(this object @this, int defaultValue)
         }
     }
 
+    /// <summary>
+    /// An object extension method that converts this object to an int 32 or default.
+    /// </summary>
+    /// <param name="this">The @this to act on.</param>
+    /// <param name="defaultValue">The default value.</param>
+    /// <param name="useDefaultIfNull">true to use default if null.</param>
+    /// <returns>The given data converted to an int.</returns>
+    public static int ToInt32OrDefault(this object @this, int defaultValue, bool useDefaultIfNull)
+    {
+        if (useDefaultIfNull && @this == null)
+        {
+            return defaultValue;
+        }
+
+        try
+        {
+            return Convert.ToInt32(@this);
+        }
+        catch (Exception)
+        {
+            return defaultValue;
+        }
+    }
+
     /// <summary>
     ///     An object extension method that converts this object to an int 32 or default.
     /// </summary>
@@ -60,4 +84,28 @@ public static int ToInt32OrDefault(this object @this, Func<int> defaultValueFact
             return defaultValueFactory();
         }
     }
+
+    /// <summary>
+    /// An object extension method that converts this object to an int 32 or default.
+    /// </summary>
+    /// <param name="this">The @this to act on.</param>
+    /// <param name="defaultValueFactory">The default value factory.</param>
+    /// <param name="useDefaultIfNull">true to use default if null.</param>
+    /// <returns>The given data converted to an int.</returns>
+    public static int ToInt32OrDefault(this object @this, Func<int> defaultValueFactory, bool useDefaultIfNull)
+    {
+        if (useDefaultIfNull && @this == null)
+        {
+            return defaultValueFactory();
+        }
+
+        try
+        {
+            return Convert.ToInt32(@this);
+        }
+        catch (Exception)
+        {
+            return defaultValueFactory();
+        }
+    }
 }
\ No newline at end of file
diff --git a/src/Z.Core/System.Object/Convert/ToValueType/Object.ToInt64OrDefault.cs b/src/Z.Core/System.Object/Convert/ToValueType/Object.ToInt64OrDefault.cs
index 0b4b520d..4fc74e2b 100644
--- a/src/Z.Core/System.Object/Convert/ToValueType/Object.ToInt64OrDefault.cs
+++ b/src/Z.Core/System.Object/Convert/ToValueType/Object.ToInt64OrDefault.cs
@@ -43,6 +43,30 @@ public static long ToInt64OrDefault(this object @this, long defaultValue)
         }
     }
 
+    /// <summary>
+    /// An object extension method that converts this object to an int 64 or default.
+    /// </summary>
+    /// <param name="this">The @this to act on.</param>
+    /// <param name="defaultValue">The default value.</param>
+    /// <param name="useDefaultIfNull">true to use default if null.</param>
+    /// <returns>The given data converted to a long.</returns>
+    public static long ToInt64OrDefault(this object @this, long defaultValue, bool useDefaultIfNull)
+    {
+        if (useDefaultIfNull && @this == null)
+        {
+            return defaultValue;
+        }
+
+        try
+        {
+            return Convert.ToInt64(@this);
+        }
+        catch (Exception)
+        {
+            return defaultValue;
+        }
+    }
+
     /// <summary>
     ///     An object extension method that converts this object to an int 64 or default.
     /// </summary>
@@ -60,4 +84,28 @@ public static long ToInt64OrDefault(this object @this, Func<long> defaultValueFa
             return defaultValueFactory();
         }
     }
+
+    /// <summary>
+    /// An object extension method that converts this object to an int 64 or default.
+    /// </summary>
+    /// <param name="this">The @this to act on.</param>
+    /// <param name="defaultValueFactory">The default value factory.</param>
+    /// <param name="useDefaultIfNull">true to use default if null.</param>
+    /// <returns>The given data converted to a long.</returns>
+    public static long ToInt64OrDefault(this object @this, Func<long> defaultValueFactory, bool useDefaultIfNull)
+    {
+        if (useDefaultIfNull && @this == null)
+        {
+            return defaultValueFactory();
+        }
+
+        try
+        {
+            return Convert.ToInt64(@this);
+        }
+        catch (Exception)
+        {
+            return defaultValueFactory();
+        }
+    }
 }
\ No newline at end of file
diff --git a/src/Z.Core/System.Object/Convert/ToValueType/Object.ToLongOrDefault.cs b/src/Z.Core/System.Object/Convert/ToValueType/Object.ToLongOrDefault.cs
index 7e3f41cc..e9f4b51e 100644
--- a/src/Z.Core/System.Object/Convert/ToValueType/Object.ToLongOrDefault.cs
+++ b/src/Z.Core/System.Object/Convert/ToValueType/Object.ToLongOrDefault.cs
@@ -43,6 +43,28 @@ public static long ToLongOrDefault(this object @this, long defaultValue)
         }
     }
 
+    /// <summary>An object extension method that converts this object to a long or default.</summary>
+    /// <param name="this">The @this to act on.</param>
+    /// <param name="defaultValue">The default value.</param>
+    /// <param name="useDefaultIfNull">true to use default if null.</param>
+    /// <returns>The given data converted to a long.</returns>
+    public static long ToLongOrDefault(this object @this, long defaultValue, bool useDefaultIfNull)
+    {
+        if (useDefaultIfNull && @this == null)
+        {
+            return defaultValue;
+        }
+
+        try
+        {
+            return Convert.ToInt64(@this);
+        }
+        catch (Exception)
+        {
+            return defaultValue;
+        }
+    }
+
     /// <summary>
     ///     An object extension method that converts this object to a long or default.
     /// </summary>
@@ -60,4 +82,26 @@ public static long ToLongOrDefault(this object @this, Func<long> defaultValueFac
             return defaultValueFactory();
         }
     }
+
+    /// <summary>An object extension method that converts this object to a long or default.</summary>
+    /// <param name="this">The @this to act on.</param>
+    /// <param name="defaultValueFactory">The default value factory.</param>
+    /// <param name="useDefaultIfNull">true to use default if null.</param>
+    /// <returns>The given data converted to a long.</returns>
+    public static long ToLongOrDefault(this object @this, Func<long> defaultValueFactory, bool useDefaultIfNull)
+    {
+        if (useDefaultIfNull && @this == null)
+        {
+            return defaultValueFactory();
+        }
+
+        try
+        {
+            return Convert.ToInt64(@this);
+        }
+        catch (Exception)
+        {
+            return defaultValueFactory();
+        }
+    }
 }
\ No newline at end of file
diff --git a/src/Z.Core/System.Object/Convert/ToValueType/Object.ToSByteOrDefault.cs b/src/Z.Core/System.Object/Convert/ToValueType/Object.ToSByteOrDefault.cs
index e696e323..8e2826ca 100644
--- a/src/Z.Core/System.Object/Convert/ToValueType/Object.ToSByteOrDefault.cs
+++ b/src/Z.Core/System.Object/Convert/ToValueType/Object.ToSByteOrDefault.cs
@@ -43,6 +43,30 @@ public static sbyte ToSByteOrDefault(this object @this, sbyte defaultValue)
         }
     }
 
+    /// <summary>
+    /// An object extension method that converts this object to the s byte or default.
+    /// </summary>
+    /// <param name="this">The @this to act on.</param>
+    /// <param name="defaultValue">The default value.</param>
+    /// <param name="useDefaultIfNull">true to use default if null.</param>
+    /// <returns>The given data converted to a sbyte.</returns>
+    public static sbyte ToSByteOrDefault(this object @this, sbyte defaultValue, bool useDefaultIfNull)
+    {
+        if (useDefaultIfNull && @this == null)
+        {
+            return defaultValue;
+        }
+
+        try
+        {
+            return Convert.ToSByte(@this);
+        }
+        catch (Exception)
+        {
+            return defaultValue;
+        }
+    }
+
     /// <summary>
     ///     An object extension method that converts this object to the s byte or default.
     /// </summary>
@@ -60,4 +84,28 @@ public static sbyte ToSByteOrDefault(this object @this, Func<sbyte> defaultValue
             return defaultValueFactory();
         }
     }
+
+    /// <summary>
+    /// An object extension method that converts this object to the s byte or default.
+    /// </summary>
+    /// <param name="this">The @this to act on.</param>
+    /// <param name="defaultValueFactory">The default value factory.</param>
+    /// <param name="useDefaultIfNull">true to use default if null.</param>
+    /// <returns>The given data converted to a sbyte.</returns>
+    public static sbyte ToSByteOrDefault(this object @this, Func<sbyte> defaultValueFactory, bool useDefaultIfNull)
+    {
+        if (useDefaultIfNull && @this == null)
+        {
+            return defaultValueFactory();
+        }
+
+        try
+        {
+            return Convert.ToSByte(@this);
+        }
+        catch (Exception)
+        {
+            return defaultValueFactory();
+        }
+    }
 }
\ No newline at end of file
diff --git a/src/Z.Core/System.Object/Convert/ToValueType/Object.ToShortOrDefault.cs b/src/Z.Core/System.Object/Convert/ToValueType/Object.ToShortOrDefault.cs
index c3751f30..39ba123d 100644
--- a/src/Z.Core/System.Object/Convert/ToValueType/Object.ToShortOrDefault.cs
+++ b/src/Z.Core/System.Object/Convert/ToValueType/Object.ToShortOrDefault.cs
@@ -43,6 +43,30 @@ public static short ToShortOrDefault(this object @this, short defaultValue)
         }
     }
 
+    /// <summary>
+    /// An object extension method that converts this object to a short or default.
+    /// </summary>
+    /// <param name="this">The @this to act on.</param>
+    /// <param name="defaultValue">The default value.</param>
+    /// <param name="useDefaultIfNull">true to use default if null.</param>
+    /// <returns>The given data converted to a short.</returns>
+    public static short ToShortOrDefault(this object @this, short defaultValue, bool useDefaultIfNull)
+    {
+        if (useDefaultIfNull && @this == null)
+        {
+            return defaultValue;
+        }
+
+        try
+        {
+            return Convert.ToInt16(@this);
+        }
+        catch (Exception)
+        {
+            return defaultValue;
+        }
+    }
+
     /// <summary>
     ///     An object extension method that converts this object to a short or default.
     /// </summary>
@@ -60,4 +84,28 @@ public static short ToShortOrDefault(this object @this, Func<short> defaultValue
             return defaultValueFactory();
         }
     }
+
+    /// <summary>
+    /// An object extension method that converts this object to a short or default.
+    /// </summary>
+    /// <param name="this">The @this to act on.</param>
+    /// <param name="defaultValueFactory">The default value factory.</param>
+    /// <param name="useDefaultIfNull">true to use default if null.</param>
+    /// <returns>The given data converted to a short.</returns>
+    public static short ToShortOrDefault(this object @this, Func<short> defaultValueFactory, bool useDefaultIfNull)
+    {
+        if (useDefaultIfNull && @this == null)
+        {
+            return defaultValueFactory();
+        }
+
+        try
+        {
+            return Convert.ToInt16(@this);
+        }
+        catch (Exception)
+        {
+            return defaultValueFactory();
+        }
+    }
 }
\ No newline at end of file
diff --git a/src/Z.Core/System.Object/Convert/ToValueType/Object.ToSingleOrDefault.cs b/src/Z.Core/System.Object/Convert/ToValueType/Object.ToSingleOrDefault.cs
index f6ae7312..767772e8 100644
--- a/src/Z.Core/System.Object/Convert/ToValueType/Object.ToSingleOrDefault.cs
+++ b/src/Z.Core/System.Object/Convert/ToValueType/Object.ToSingleOrDefault.cs
@@ -43,6 +43,30 @@ public static float ToSingleOrDefault(this object @this, float defaultValue)
         }
     }
 
+    /// <summary>
+    /// An object extension method that converts this object to a single or default.
+    /// </summary>
+    /// <param name="this">The @this to act on.</param>
+    /// <param name="defaultValue">The default value.</param>
+    /// <param name="useDefaultIfNull">true to use default if null.</param>
+    /// <returns>The given data converted to a float.</returns>
+    public static float ToSingleOrDefault(this object @this, float defaultValue, bool useDefaultIfNull)
+    {
+        if (useDefaultIfNull && @this == null)
+        {
+            return defaultValue;
+        }
+
+        try
+        {
+            return Convert.ToSingle(@this);
+        }
+        catch (Exception)
+        {
+            return defaultValue;
+        }
+    }
+
     /// <summary>
     ///     An object extension method that converts this object to a single or default.
     /// </summary>
@@ -60,4 +84,28 @@ public static float ToSingleOrDefault(this object @this, Func<float> defaultValu
             return defaultValueFactory();
         }
     }
+
+    /// <summary>
+    /// An object extension method that converts this object to a single or default.
+    /// </summary>
+    /// <param name="this">The @this to act on.</param>
+    /// <param name="defaultValueFactory">The default value factory.</param>
+    /// <param name="useDefaultIfNull">true to use default if null.</param>
+    /// <returns>The given data converted to a float.</returns>
+    public static float ToSingleOrDefault(this object @this, Func<float> defaultValueFactory, bool useDefaultIfNull)
+    {
+        if (useDefaultIfNull && @this == null)
+        {
+            return defaultValueFactory();
+        }
+
+        try
+        {
+            return Convert.ToSingle(@this);
+        }
+        catch (Exception)
+        {
+            return defaultValueFactory();
+        }
+    }
 }
\ No newline at end of file
diff --git a/src/Z.Core/System.Object/Convert/ToValueType/Object.ToStringOrDefault.cs b/src/Z.Core/System.Object/Convert/ToValueType/Object.ToStringOrDefault.cs
index ec1df75a..ced4c6d4 100644
--- a/src/Z.Core/System.Object/Convert/ToValueType/Object.ToStringOrDefault.cs
+++ b/src/Z.Core/System.Object/Convert/ToValueType/Object.ToStringOrDefault.cs
@@ -43,6 +43,30 @@ public static string ToStringOrDefault(this object @this, string defaultValue)
         }
     }
 
+    /// <summary>
+    /// An object extension method that converts this object to a string or default.
+    /// </summary>
+    /// <param name="this">The @this to act on.</param>
+    /// <param name="defaultValue">The default value.</param>
+    /// <param name="useDefaultIfNull">true to use default if null.</param>
+    /// <returns>The given data converted to a string.</returns>
+    public static string ToStringOrDefault(this object @this, string defaultValue, bool useDefaultIfNull)
+    {
+        if (useDefaultIfNull && @this == null)
+        {
+            return defaultValue;
+        }
+
+        try
+        {
+            return Convert.ToString(@this);
+        }
+        catch (Exception)
+        {
+            return defaultValue;
+        }
+    }
+
     /// <summary>
     ///     An object extension method that converts this object to a string or default.
     /// </summary>
@@ -60,4 +84,28 @@ public static string ToStringOrDefault(this object @this, Func<string> defaultVa
             return defaultValueFactory();
         }
     }
+
+    /// <summary>
+    /// An object extension method that converts this object to a string or default.
+    /// </summary>
+    /// <param name="this">The @this to act on.</param>
+    /// <param name="defaultValueFactory">The default value factory.</param>
+    /// <param name="useDefaultIfNull">true to use default if null.</param>
+    /// <returns>The given data converted to a string.</returns>
+    public static string ToStringOrDefault(this object @this, Func<string> defaultValueFactory, bool useDefaultIfNull)
+    {
+        if (useDefaultIfNull && @this == null)
+        {
+            return defaultValueFactory();
+        }
+
+        try
+        {
+            return Convert.ToString(@this);
+        }
+        catch (Exception)
+        {
+            return defaultValueFactory();
+        }
+    }
 }
\ No newline at end of file
diff --git a/src/Z.Core/System.Object/Convert/ToValueType/Object.ToUInt16OrDefault.cs b/src/Z.Core/System.Object/Convert/ToValueType/Object.ToUInt16OrDefault.cs
index ddbf6c36..1e0e5317 100644
--- a/src/Z.Core/System.Object/Convert/ToValueType/Object.ToUInt16OrDefault.cs
+++ b/src/Z.Core/System.Object/Convert/ToValueType/Object.ToUInt16OrDefault.cs
@@ -43,6 +43,30 @@ public static ushort ToUInt16OrDefault(this object @this, ushort defaultValue)
         }
     }
 
+    /// <summary>
+    /// An object extension method that converts this object to an u int 16 or default.
+    /// </summary>
+    /// <param name="this">The @this to act on.</param>
+    /// <param name="defaultValue">The default value.</param>
+    /// <param name="useDefaultIfNull">true to use default if null.</param>
+    /// <returns>The given data converted to an ushort.</returns>
+    public static ushort ToUInt16OrDefault(this object @this, ushort defaultValue, bool useDefaultIfNull)
+    {
+        if (useDefaultIfNull && @this == null)
+        {
+            return defaultValue;
+        }
+
+        try
+        {
+            return Convert.ToUInt16(@this);
+        }
+        catch (Exception)
+        {
+            return defaultValue;
+        }
+    }
+
     /// <summary>
     ///     An object extension method that converts this object to an u int 16 or default.
     /// </summary>
@@ -60,4 +84,28 @@ public static ushort ToUInt16OrDefault(this object @this, Func<ushort> defaultVa
             return defaultValueFactory();
         }
     }
+
+    /// <summary>
+    /// An object extension method that converts this object to an u int 16 or default.
+    /// </summary>
+    /// <param name="this">The @this to act on.</param>
+    /// <param name="defaultValueFactory">The default value factory.</param>
+    /// <param name="useDefaultIfNull">true to use default if null.</param>
+    /// <returns>The given data converted to an ushort.</returns>
+    public static ushort ToUInt16OrDefault(this object @this, Func<ushort> defaultValueFactory, bool useDefaultIfNull)
+    {
+        if (useDefaultIfNull && @this == null)
+        {
+            return defaultValueFactory();
+        }
+
+        try
+        {
+            return Convert.ToUInt16(@this);
+        }
+        catch (Exception)
+        {
+            return defaultValueFactory();
+        }
+    }
 }
\ No newline at end of file
diff --git a/src/Z.Core/System.Object/Convert/ToValueType/Object.ToUInt32OrDefault.cs b/src/Z.Core/System.Object/Convert/ToValueType/Object.ToUInt32OrDefault.cs
index e640c2a0..38a2128b 100644
--- a/src/Z.Core/System.Object/Convert/ToValueType/Object.ToUInt32OrDefault.cs
+++ b/src/Z.Core/System.Object/Convert/ToValueType/Object.ToUInt32OrDefault.cs
@@ -43,6 +43,30 @@ public static uint ToUInt32OrDefault(this object @this, uint defaultValue)
         }
     }
 
+    /// <summary>
+    /// An object extension method that converts this object to an u int 32 or default.
+    /// </summary>
+    /// <param name="this">The @this to act on.</param>
+    /// <param name="defaultValue">The default value.</param>
+    /// <param name="useDefaultIfNull">true to use default if null.</param>
+    /// <returns>The given data converted to an uint.</returns>
+    public static uint ToUInt32OrDefault(this object @this, uint defaultValue, bool useDefaultIfNull)
+    {
+        if (useDefaultIfNull && @this == null)
+        {
+            return defaultValue;
+        }
+
+        try
+        {
+            return Convert.ToUInt32(@this);
+        }
+        catch (Exception)
+        {
+            return defaultValue;
+        }
+    }
+
     /// <summary>
     ///     An object extension method that converts this object to an u int 32 or default.
     /// </summary>
@@ -60,4 +84,28 @@ public static uint ToUInt32OrDefault(this object @this, Func<uint> defaultValueF
             return defaultValueFactory();
         }
     }
+
+    /// <summary>
+    /// An object extension method that converts this object to an u int 32 or default.
+    /// </summary>
+    /// <param name="this">The @this to act on.</param>
+    /// <param name="defaultValueFactory">The default value factory.</param>
+    /// <param name="useDefaultIfNull">true to use default if null.</param>
+    /// <returns>The given data converted to an uint.</returns>
+    public static uint ToUInt32OrDefault(this object @this, Func<uint> defaultValueFactory, bool useDefaultIfNull)
+    {
+        if (useDefaultIfNull && @this == null)
+        {
+            return defaultValueFactory();
+        }
+
+        try
+        {
+            return Convert.ToUInt32(@this);
+        }
+        catch (Exception)
+        {
+            return defaultValueFactory();
+        }
+    }
 }
\ No newline at end of file
diff --git a/src/Z.Core/System.Object/Convert/ToValueType/Object.ToUInt64OrDefault.cs b/src/Z.Core/System.Object/Convert/ToValueType/Object.ToUInt64OrDefault.cs
index 8ff5b0c7..bdca8ae9 100644
--- a/src/Z.Core/System.Object/Convert/ToValueType/Object.ToUInt64OrDefault.cs
+++ b/src/Z.Core/System.Object/Convert/ToValueType/Object.ToUInt64OrDefault.cs
@@ -43,6 +43,30 @@ public static ulong ToUInt64OrDefault(this object @this, ulong defaultValue)
         }
     }
 
+    /// <summary>
+    /// An object extension method that converts this object to an u int 64 or default.
+    /// </summary>
+    /// <param name="this">The @this to act on.</param>
+    /// <param name="defaultValue">The default value.</param>
+    /// <param name="useDefaultIfNull">true to use default if null.</param>
+    /// <returns>The given data converted to an ulong.</returns>
+    public static ulong ToUInt64OrDefault(this object @this, ulong defaultValue, bool useDefaultIfNull)
+    {
+        if (useDefaultIfNull && @this == null)
+        {
+            return defaultValue;
+        }
+
+        try
+        {
+            return Convert.ToUInt64(@this);
+        }
+        catch (Exception)
+        {
+            return defaultValue;
+        }
+    }
+
     /// <summary>
     ///     An object extension method that converts this object to an u int 64 or default.
     /// </summary>
@@ -60,4 +84,28 @@ public static ulong ToUInt64OrDefault(this object @this, Func<ulong> defaultValu
             return defaultValueFactory();
         }
     }
+
+    /// <summary>
+    /// An object extension method that converts this object to an u int 64 or default.
+    /// </summary>
+    /// <param name="this">The @this to act on.</param>
+    /// <param name="defaultValueFactory">The default value factory.</param>
+    /// <param name="useDefaultIfNull">true to use default if null.</param>
+    /// <returns>The given data converted to an ulong.</returns>
+    public static ulong ToUInt64OrDefault(this object @this, Func<ulong> defaultValueFactory, bool useDefaultIfNull)
+    {
+        if (useDefaultIfNull && @this == null)
+        {
+            return defaultValueFactory();
+        }
+
+        try
+        {
+            return Convert.ToUInt64(@this);
+        }
+        catch (Exception)
+        {
+            return defaultValueFactory();
+        }
+    }
 }
\ No newline at end of file
diff --git a/src/Z.Core/System.Object/Convert/ToValueType/Object.ToULongOrDefault.cs b/src/Z.Core/System.Object/Convert/ToValueType/Object.ToULongOrDefault.cs
index 5b6c55a0..dcd4e376 100644
--- a/src/Z.Core/System.Object/Convert/ToValueType/Object.ToULongOrDefault.cs
+++ b/src/Z.Core/System.Object/Convert/ToValueType/Object.ToULongOrDefault.cs
@@ -43,6 +43,30 @@ public static ulong ToULongOrDefault(this object @this, ulong defaultValue)
         }
     }
 
+    /// <summary>
+    /// An object extension method that converts this object to an u long or default.
+    /// </summary>
+    /// <param name="this">The @this to act on.</param>
+    /// <param name="defaultValue">The default value.</param>
+    /// <param name="useDefaultIfNull">true to use default if null.</param>
+    /// <returns>The given data converted to an ulong.</returns>
+    public static ulong ToULongOrDefault(this object @this, ulong defaultValue, bool useDefaultIfNull)
+    {
+        if (useDefaultIfNull && @this == null)
+        {
+            return defaultValue;
+        }
+
+        try
+        {
+            return Convert.ToUInt64(@this);
+        }
+        catch (Exception)
+        {
+            return defaultValue;
+        }
+    }
+
     /// <summary>
     ///     An object extension method that converts this object to an u long or default.
     /// </summary>
@@ -60,4 +84,28 @@ public static ulong ToULongOrDefault(this object @this, Func<ulong> defaultValue
             return defaultValueFactory();
         }
     }
+
+    /// <summary>
+    /// An object extension method that converts this object to an u long or default.
+    /// </summary>
+    /// <param name="this">The @this to act on.</param>
+    /// <param name="defaultValueFactory">The default value factory.</param>
+    /// <param name="useDefaultIfNull">true to use default if null.</param>
+    /// <returns>The given data converted to an ulong.</returns>
+    public static ulong ToULongOrDefault(this object @this, Func<ulong> defaultValueFactory, bool useDefaultIfNull)
+    {
+        if (useDefaultIfNull && @this == null)
+        {
+            return defaultValueFactory();
+        }
+
+        try
+        {
+            return Convert.ToUInt64(@this);
+        }
+        catch (Exception)
+        {
+            return defaultValueFactory();
+        }
+    }
 }
\ No newline at end of file
diff --git a/src/Z.Core/System.Object/Convert/ToValueType/Object.ToUShortOrDefault.cs b/src/Z.Core/System.Object/Convert/ToValueType/Object.ToUShortOrDefault.cs
index b17bcab6..0efb961b 100644
--- a/src/Z.Core/System.Object/Convert/ToValueType/Object.ToUShortOrDefault.cs
+++ b/src/Z.Core/System.Object/Convert/ToValueType/Object.ToUShortOrDefault.cs
@@ -43,6 +43,30 @@ public static ushort ToUShortOrDefault(this object @this, ushort defaultValue)
         }
     }
 
+    /// <summary>
+    /// An object extension method that converts this object to an u short or default.
+    /// </summary>
+    /// <param name="this">The @this to act on.</param>
+    /// <param name="defaultValue">The default value.</param>
+    /// <param name="useDefaultIfNull">true to use default if null.</param>
+    /// <returns>The given data converted to an ushort.</returns>
+    public static ushort ToUShortOrDefault(this object @this, ushort defaultValue, bool useDefaultIfNull)
+    {
+        if (useDefaultIfNull && @this == null)
+        {
+            return defaultValue;
+        }
+
+        try
+        {
+            return Convert.ToUInt16(@this);
+        }
+        catch (Exception)
+        {
+            return defaultValue;
+        }
+    }
+
     /// <summary>
     ///     An object extension method that converts this object to an u short or default.
     /// </summary>
@@ -60,4 +84,28 @@ public static ushort ToUShortOrDefault(this object @this, Func<ushort> defaultVa
             return defaultValueFactory();
         }
     }
+
+    /// <summary>
+    /// An object extension method that converts this object to an u short or default.
+    /// </summary>
+    /// <param name="this">The @this to act on.</param>
+    /// <param name="defaultValueFactory">The default value factory.</param>
+    /// <param name="useDefaultIfNull">true to use default if null.</param>
+    /// <returns>The given data converted to an ushort.</returns>
+    public static ushort ToUShortOrDefault(this object @this, Func<ushort> defaultValueFactory, bool useDefaultIfNull)
+    {
+        if (useDefaultIfNull && @this == null)
+        {
+            return defaultValueFactory();
+        }
+
+        try
+        {
+            return Convert.ToUInt16(@this);
+        }
+        catch (Exception)
+        {
+            return defaultValueFactory();
+        }
+    }
 }
\ No newline at end of file