Fix error when annotation is added

GroupDocs.Annotation for .NET/Controllers/AddAnnotationController.cs

@@ -8,6 +8,7 @@
 using Newtonsoft.Json.Serialization;
 using System;
 using System.Collections.Generic;
+using System.IO;
 using System.Linq;
 using System.Web;
 using System.Web.Mvc;
@@ -29,10 +30,8 @@ public ActionResult Post(string file)
             Document doc = documentDataHandler.GetDocument(filename);
             long documentId = doc != null ? doc.Id : imageHandler.CreateDocument(filename);
 
-            //StreamReader stream = new StreamReader(Request.InputStream);
-            //string x = stream.ReadToEnd();  // added to view content of input stream
-
-            AnnotationInfo annotation = new AnnotationInfo(); //Request.InputStream as AnnotationInfo;
+            Request.InputStream.Seek(0, SeekOrigin.Begin);
+            AnnotationInfo annotation = new JsonSerializer().Deserialize<AnnotationInfo>(new JsonTextReader(new StreamReader(Request.InputStream)));
             annotation.DocumentGuid = documentId;
             CreateAnnotationResult result = imageHandler.CreateAnnotation(annotation);
             return Content(JsonConvert.SerializeObject(
@@ -43,4 +42,5 @@ public ActionResult Post(string file)
 
         }
     }
-}
+}
+