diff --git a/GUI/MainForm.Designer.cs b/GUI/MainForm.Designer.cs
index cfcdf0f..e6d1e51 100644
--- a/GUI/MainForm.Designer.cs
+++ b/GUI/MainForm.Designer.cs
@@ -1,37 +1,35 @@
-namespace excel2json.GUI {
-    partial class MainForm {
-        /// <summary>
-        /// Required designer variable.
-        /// </summary>
-        private System.ComponentModel.IContainer components = null;
-
-        /// <summary>
-        /// Clean up any resources being used.
-        /// </summary>
-        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
-        protected override void Dispose(bool disposing) {
-            if (disposing && (components != null)) {
-                components.Dispose();
-            }
-            base.Dispose(disposing);
-        }
-
-        #region Windows Form Designer generated code
-
-        /// <summary>
-        /// Required method for Designer support - do not modify
-        /// the contents of this method with the code editor.
-        /// </summary>
-        private void InitializeComponent()
-        {
+namespace excel2json.GUI {
+    partial class MainForm {
+        /// <summary>
+        /// Required designer variable.
+        /// </summary>
+        private System.ComponentModel.IContainer components = null;
+
+        /// <summary>
+        /// Clean up any resources being used.
+        /// </summary>
+        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
+        protected override void Dispose(bool disposing) {
+            if (disposing && (components != null)) {
+                components.Dispose();
+            }
+            base.Dispose(disposing);
+        }
+
+        #region Windows Form Designer generated code
+
+        /// <summary>
+        /// Required method for Designer support - do not modify
+        /// the contents of this method with the code editor.
+        /// </summary>
+        private void InitializeComponent() {
             System.Windows.Forms.Label label2;
             System.Windows.Forms.Label label1;
             System.Windows.Forms.Label label4;
             System.Windows.Forms.Label label3;
             System.Windows.Forms.Label label5;
             System.Windows.Forms.Label label6;
-            System.ComponentModel.ComponentResourceManager resources =
-                new System.ComponentModel.ComponentResourceManager(typeof(MainForm));
+            System.ComponentModel.ComponentResourceManager resources = new System.ComponentModel.ComponentResourceManager(typeof(MainForm));
             this.statusStrip = new System.Windows.Forms.StatusStrip();
             this.statusLabel = new System.Windows.Forms.ToolStripStatusLabel();
             this.toolStrip = new System.Windows.Forms.ToolStrip();
@@ -66,24 +64,23 @@ private void InitializeComponent()
             label6 = new System.Windows.Forms.Label();
             this.statusStrip.SuspendLayout();
             this.toolStrip.SuspendLayout();
-            ((System.ComponentModel.ISupportInitialize) (this.splitContainer1)).BeginInit();
+            ((System.ComponentModel.ISupportInitialize)(this.splitContainer1)).BeginInit();
             this.splitContainer1.Panel1.SuspendLayout();
             this.splitContainer1.Panel2.SuspendLayout();
             this.splitContainer1.SuspendLayout();
             this.flowLayoutPanel1.SuspendLayout();
             this.panelExcelDropBox.SuspendLayout();
             this.flowLayoutPanel2.SuspendLayout();
-            ((System.ComponentModel.ISupportInitialize) (this.pictureBoxExcel)).BeginInit();
+            ((System.ComponentModel.ISupportInitialize)(this.pictureBoxExcel)).BeginInit();
             this.groupBox1.SuspendLayout();
             this.tabControlCode.SuspendLayout();
             this.SuspendLayout();
             // 
             // label2
             // 
-            label2.Location = new System.Drawing.Point(11, 99);
-            label2.Margin = new System.Windows.Forms.Padding(5, 0, 5, 0);
+            label2.Location = new System.Drawing.Point(6, 49);
             label2.Name = "label2";
-            label2.Size = new System.Drawing.Size(142, 24);
+            label2.Size = new System.Drawing.Size(77, 12);
             label2.TabIndex = 1;
             label2.Text = "Encoding:";
             label2.TextAlign = System.Drawing.ContentAlignment.MiddleRight;
@@ -91,52 +88,47 @@ private void InitializeComponent()
             // label1
             // 
             label1.AutoSize = true;
-            label1.Location = new System.Drawing.Point(36, 43);
-            label1.Margin = new System.Windows.Forms.Padding(5, 0, 5, 0);
+            label1.Location = new System.Drawing.Point(6, 23);
             label1.Name = "label1";
-            label1.Size = new System.Drawing.Size(117, 24);
+            label1.Size = new System.Drawing.Size(77, 12);
             label1.TabIndex = 1;
             label1.Text = "Export Type:";
             label1.TextAlign = System.Drawing.ContentAlignment.MiddleRight;
             // 
             // label4
             // 
-            label4.Location = new System.Drawing.Point(11, 149);
-            label4.Margin = new System.Windows.Forms.Padding(5, 0, 5, 0);
+            label4.Location = new System.Drawing.Point(6, 75);
             label4.Name = "label4";
-            label4.Size = new System.Drawing.Size(142, 24);
+            label4.Size = new System.Drawing.Size(77, 12);
             label4.TabIndex = 6;
             label4.Text = "Lowcase:";
             label4.TextAlign = System.Drawing.ContentAlignment.MiddleRight;
             // 
             // label3
             // 
-            label3.Location = new System.Drawing.Point(11, 203);
-            label3.Margin = new System.Windows.Forms.Padding(5, 0, 5, 0);
+            label3.Location = new System.Drawing.Point(6, 101);
             label3.Name = "label3";
-            label3.Size = new System.Drawing.Size(142, 24);
+            label3.Size = new System.Drawing.Size(77, 12);
             label3.TabIndex = 4;
             label3.Text = "Header:";
             label3.TextAlign = System.Drawing.ContentAlignment.MiddleRight;
             // 
             // label5
             // 
-            label5.Location = new System.Drawing.Point(11, 253);
-            label5.Margin = new System.Windows.Forms.Padding(5, 0, 5, 0);
+            label5.Location = new System.Drawing.Point(6, 127);
             label5.Name = "label5";
-            label5.Size = new System.Drawing.Size(142, 24);
+            label5.Size = new System.Drawing.Size(77, 12);
             label5.TabIndex = 9;
             label5.Text = "Date Format:";
             label5.TextAlign = System.Drawing.ContentAlignment.MiddleRight;
             // 
             // statusStrip
             // 
-            this.statusStrip.ImageScalingSize = new System.Drawing.Size(24, 24);
-            this.statusStrip.Items.AddRange(new System.Windows.Forms.ToolStripItem[] {this.statusLabel});
-            this.statusStrip.Location = new System.Drawing.Point(0, 1095);
+            this.statusStrip.Items.AddRange(new System.Windows.Forms.ToolStripItem[] {
+            this.statusLabel});
+            this.statusStrip.Location = new System.Drawing.Point(0, 540);
             this.statusStrip.Name = "statusStrip";
-            this.statusStrip.Padding = new System.Windows.Forms.Padding(2, 0, 26, 0);
-            this.statusStrip.Size = new System.Drawing.Size(1437, 29);
+            this.statusStrip.Size = new System.Drawing.Size(784, 22);
             this.statusStrip.TabIndex = 2;
             this.statusStrip.Text = "Ready";
             // 
@@ -145,7 +137,7 @@ private void InitializeComponent()
             this.statusLabel.IsLink = true;
             this.statusLabel.Name = "statusLabel";
             this.statusLabel.RightToLeft = System.Windows.Forms.RightToLeft.No;
-            this.statusLabel.Size = new System.Drawing.Size(211, 24);
+            this.statusLabel.Size = new System.Drawing.Size(139, 17);
             this.statusLabel.Text = "https://neil3d.github.io";
             this.statusLabel.TextAlign = System.Drawing.ContentAlignment.MiddleLeft;
             this.statusLabel.Click += new System.EventHandler(this.statusLabel_Click);
@@ -154,15 +146,16 @@ private void InitializeComponent()
             // 
             this.toolStrip.GripStyle = System.Windows.Forms.ToolStripGripStyle.Hidden;
             this.toolStrip.ImageScalingSize = new System.Drawing.Size(24, 24);
-            this.toolStrip.Items.AddRange(new System.Windows.Forms.ToolStripItem[]
-            {
-                this.btnImportExcel, this.toolStripSeparator1, this.btnCopyJSON, this.btnSaveJson,
-                this.toolStripSeparator2, this.btnHelp
-            });
+            this.toolStrip.Items.AddRange(new System.Windows.Forms.ToolStripItem[] {
+            this.btnImportExcel,
+            this.toolStripSeparator1,
+            this.btnCopyJSON,
+            this.btnSaveJson,
+            this.toolStripSeparator2,
+            this.btnHelp});
             this.toolStrip.Location = new System.Drawing.Point(0, 0);
             this.toolStrip.Name = "toolStrip";
-            this.toolStrip.Padding = new System.Windows.Forms.Padding(0, 0, 2, 0);
-            this.toolStrip.Size = new System.Drawing.Size(1437, 55);
+            this.toolStrip.Size = new System.Drawing.Size(784, 48);
             this.toolStrip.TabIndex = 4;
             this.toolStrip.Text = "Import excel file and export as JSON";
             // 
@@ -171,7 +164,7 @@ private void InitializeComponent()
             this.btnImportExcel.Image = global::excel2json.Properties.Resources.excel;
             this.btnImportExcel.ImageTransparentColor = System.Drawing.Color.Magenta;
             this.btnImportExcel.Name = "btnImportExcel";
-            this.btnImportExcel.Size = new System.Drawing.Size(121, 52);
+            this.btnImportExcel.Size = new System.Drawing.Size(85, 45);
             this.btnImportExcel.Text = "Import Excel";
             this.btnImportExcel.TextImageRelation = System.Windows.Forms.TextImageRelation.ImageAboveText;
             this.btnImportExcel.ToolTipText = "Import Excel .xlsx file";
@@ -180,14 +173,14 @@ private void InitializeComponent()
             // toolStripSeparator1
             // 
             this.toolStripSeparator1.Name = "toolStripSeparator1";
-            this.toolStripSeparator1.Size = new System.Drawing.Size(6, 55);
+            this.toolStripSeparator1.Size = new System.Drawing.Size(6, 48);
             // 
             // btnCopyJSON
             // 
             this.btnCopyJSON.Image = global::excel2json.Properties.Resources.clipboard;
             this.btnCopyJSON.ImageTransparentColor = System.Drawing.Color.Magenta;
             this.btnCopyJSON.Name = "btnCopyJSON";
-            this.btnCopyJSON.Size = new System.Drawing.Size(111, 52);
+            this.btnCopyJSON.Size = new System.Drawing.Size(78, 45);
             this.btnCopyJSON.Text = "Copy JSON";
             this.btnCopyJSON.TextImageRelation = System.Windows.Forms.TextImageRelation.ImageAboveText;
             this.btnCopyJSON.ToolTipText = "Copy JSON string to clipboard";
@@ -198,7 +191,7 @@ private void InitializeComponent()
             this.btnSaveJson.Image = global::excel2json.Properties.Resources.json;
             this.btnSaveJson.ImageTransparentColor = System.Drawing.Color.Magenta;
             this.btnSaveJson.Name = "btnSaveJson";
-            this.btnSaveJson.Size = new System.Drawing.Size(105, 52);
+            this.btnSaveJson.Size = new System.Drawing.Size(75, 45);
             this.btnSaveJson.Text = "Save JSON";
             this.btnSaveJson.TextImageRelation = System.Windows.Forms.TextImageRelation.ImageAboveText;
             this.btnSaveJson.ToolTipText = "Save JSON file";
@@ -207,14 +200,14 @@ private void InitializeComponent()
             // toolStripSeparator2
             // 
             this.toolStripSeparator2.Name = "toolStripSeparator2";
-            this.toolStripSeparator2.Size = new System.Drawing.Size(6, 55);
+            this.toolStripSeparator2.Size = new System.Drawing.Size(6, 48);
             // 
             // btnHelp
             // 
             this.btnHelp.Image = global::excel2json.Properties.Resources.about;
             this.btnHelp.ImageTransparentColor = System.Drawing.Color.Magenta;
             this.btnHelp.Name = "btnHelp";
-            this.btnHelp.Size = new System.Drawing.Size(55, 52);
+            this.btnHelp.Size = new System.Drawing.Size(39, 45);
             this.btnHelp.Text = "Help";
             this.btnHelp.TextImageRelation = System.Windows.Forms.TextImageRelation.ImageAboveText;
             this.btnHelp.ToolTipText = "Help Document on web";
@@ -225,8 +218,7 @@ private void InitializeComponent()
             this.splitContainer1.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
             this.splitContainer1.Dock = System.Windows.Forms.DockStyle.Fill;
             this.splitContainer1.FixedPanel = System.Windows.Forms.FixedPanel.Panel1;
-            this.splitContainer1.Location = new System.Drawing.Point(0, 55);
-            this.splitContainer1.Margin = new System.Windows.Forms.Padding(5, 5, 5, 5);
+            this.splitContainer1.Location = new System.Drawing.Point(0, 48);
             this.splitContainer1.Name = "splitContainer1";
             // 
             // splitContainer1.Panel1
@@ -236,9 +228,8 @@ private void InitializeComponent()
             // splitContainer1.Panel2
             // 
             this.splitContainer1.Panel2.Controls.Add(this.tabControlCode);
-            this.splitContainer1.Size = new System.Drawing.Size(1437, 1040);
+            this.splitContainer1.Size = new System.Drawing.Size(784, 492);
             this.splitContainer1.SplitterDistance = 261;
-            this.splitContainer1.SplitterWidth = 7;
             this.splitContainer1.TabIndex = 5;
             // 
             // flowLayoutPanel1
@@ -248,9 +239,8 @@ private void InitializeComponent()
             this.flowLayoutPanel1.Dock = System.Windows.Forms.DockStyle.Fill;
             this.flowLayoutPanel1.FlowDirection = System.Windows.Forms.FlowDirection.TopDown;
             this.flowLayoutPanel1.Location = new System.Drawing.Point(0, 0);
-            this.flowLayoutPanel1.Margin = new System.Windows.Forms.Padding(5, 5, 5, 5);
             this.flowLayoutPanel1.Name = "flowLayoutPanel1";
-            this.flowLayoutPanel1.Size = new System.Drawing.Size(259, 1038);
+            this.flowLayoutPanel1.Size = new System.Drawing.Size(259, 490);
             this.flowLayoutPanel1.TabIndex = 0;
             // 
             // panelExcelDropBox
@@ -259,15 +249,13 @@ private void InitializeComponent()
             this.panelExcelDropBox.BackColor = System.Drawing.SystemColors.ControlLight;
             this.panelExcelDropBox.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
             this.panelExcelDropBox.Controls.Add(this.flowLayoutPanel2);
-            this.panelExcelDropBox.Location = new System.Drawing.Point(15, 16);
-            this.panelExcelDropBox.Margin = new System.Windows.Forms.Padding(15, 16, 15, 16);
+            this.panelExcelDropBox.Location = new System.Drawing.Point(8, 8);
+            this.panelExcelDropBox.Margin = new System.Windows.Forms.Padding(8);
             this.panelExcelDropBox.Name = "panelExcelDropBox";
-            this.panelExcelDropBox.Size = new System.Drawing.Size(447, 422);
+            this.panelExcelDropBox.Size = new System.Drawing.Size(245, 212);
             this.panelExcelDropBox.TabIndex = 1;
-            this.panelExcelDropBox.DragDrop +=
-                new System.Windows.Forms.DragEventHandler(this.panelExcelDropBox_DragDrop);
-            this.panelExcelDropBox.DragEnter +=
-                new System.Windows.Forms.DragEventHandler(this.panelExcelDropBox_DragEnter);
+            this.panelExcelDropBox.DragDrop += new System.Windows.Forms.DragEventHandler(this.panelExcelDropBox_DragDrop);
+            this.panelExcelDropBox.DragEnter += new System.Windows.Forms.DragEventHandler(this.panelExcelDropBox_DragEnter);
             // 
             // flowLayoutPanel2
             // 
@@ -276,31 +264,27 @@ private void InitializeComponent()
             this.flowLayoutPanel2.Dock = System.Windows.Forms.DockStyle.Fill;
             this.flowLayoutPanel2.FlowDirection = System.Windows.Forms.FlowDirection.TopDown;
             this.flowLayoutPanel2.Location = new System.Drawing.Point(0, 0);
-            this.flowLayoutPanel2.Margin = new System.Windows.Forms.Padding(5, 5, 5, 5);
             this.flowLayoutPanel2.Name = "flowLayoutPanel2";
-            this.flowLayoutPanel2.Size = new System.Drawing.Size(445, 420);
+            this.flowLayoutPanel2.Size = new System.Drawing.Size(243, 210);
             this.flowLayoutPanel2.TabIndex = 0;
             // 
             // pictureBoxExcel
             // 
             this.pictureBoxExcel.Image = global::excel2json.Properties.Resources.excel_64;
-            this.pictureBoxExcel.Location = new System.Drawing.Point(5, 5);
-            this.pictureBoxExcel.Margin = new System.Windows.Forms.Padding(5, 5, 5, 5);
+            this.pictureBoxExcel.Location = new System.Drawing.Point(3, 3);
             this.pictureBoxExcel.Name = "pictureBoxExcel";
-            this.pictureBoxExcel.Size = new System.Drawing.Size(435, 200);
+            this.pictureBoxExcel.Size = new System.Drawing.Size(237, 100);
             this.pictureBoxExcel.SizeMode = System.Windows.Forms.PictureBoxSizeMode.CenterImage;
             this.pictureBoxExcel.TabIndex = 0;
             this.pictureBoxExcel.TabStop = false;
             // 
             // labelExcelFile
             // 
-            this.labelExcelFile.Font = new System.Drawing.Font("微软雅黑", 10F, System.Drawing.FontStyle.Regular,
-                System.Drawing.GraphicsUnit.Point, ((byte) (134)));
-            this.labelExcelFile.Location = new System.Drawing.Point(5, 210);
-            this.labelExcelFile.Margin = new System.Windows.Forms.Padding(5, 0, 5, 0);
+            this.labelExcelFile.Font = new System.Drawing.Font("微软雅黑", 10F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134)));
+            this.labelExcelFile.Location = new System.Drawing.Point(3, 106);
             this.labelExcelFile.Name = "labelExcelFile";
             this.labelExcelFile.RightToLeft = System.Windows.Forms.RightToLeft.No;
-            this.labelExcelFile.Size = new System.Drawing.Size(435, 140);
+            this.labelExcelFile.Size = new System.Drawing.Size(237, 70);
             this.labelExcelFile.TabIndex = 1;
             this.labelExcelFile.Text = "Drop you .xlsx file here!";
             this.labelExcelFile.TextAlign = System.Drawing.ContentAlignment.MiddleCenter;
@@ -322,11 +306,10 @@ private void InitializeComponent()
             this.groupBox1.Controls.Add(this.comboBoxEncoding);
             this.groupBox1.Controls.Add(this.comboBoxType);
             this.groupBox1.Dock = System.Windows.Forms.DockStyle.Fill;
-            this.groupBox1.Location = new System.Drawing.Point(15, 470);
-            this.groupBox1.Margin = new System.Windows.Forms.Padding(15, 16, 15, 16);
+            this.groupBox1.Location = new System.Drawing.Point(8, 236);
+            this.groupBox1.Margin = new System.Windows.Forms.Padding(8);
             this.groupBox1.Name = "groupBox1";
-            this.groupBox1.Padding = new System.Windows.Forms.Padding(5, 5, 5, 5);
-            this.groupBox1.Size = new System.Drawing.Size(447, 438);
+            this.groupBox1.Size = new System.Drawing.Size(245, 238);
             this.groupBox1.TabIndex = 3;
             this.groupBox1.TabStop = false;
             this.groupBox1.Text = "Options";
@@ -335,20 +318,20 @@ private void InitializeComponent()
             // 
             this.comboBoxDateFormat.DisplayMember = "0";
             this.comboBoxDateFormat.FormattingEnabled = true;
-            this.comboBoxDateFormat.Items.AddRange(new object[] {"yyyy/MM/dd", "yyyy/MM/dd hh:mm:ss"});
-            this.comboBoxDateFormat.Location = new System.Drawing.Point(164, 248);
-            this.comboBoxDateFormat.Margin = new System.Windows.Forms.Padding(5, 5, 5, 5);
+            this.comboBoxDateFormat.Items.AddRange(new object[] {
+            "yyyy/MM/dd",
+            "yyyy/MM/dd hh:mm:ss"});
+            this.comboBoxDateFormat.Location = new System.Drawing.Point(89, 124);
             this.comboBoxDateFormat.Name = "comboBoxDateFormat";
-            this.comboBoxDateFormat.Size = new System.Drawing.Size(272, 32);
+            this.comboBoxDateFormat.Size = new System.Drawing.Size(150, 20);
             this.comboBoxDateFormat.TabIndex = 8;
             this.comboBoxDateFormat.ValueMember = "0";
             // 
             // btnReimport
             // 
-            this.btnReimport.Location = new System.Drawing.Point(128, 360);
-            this.btnReimport.Margin = new System.Windows.Forms.Padding(5, 5, 5, 5);
+            this.btnReimport.Location = new System.Drawing.Point(68, 195);
             this.btnReimport.Name = "btnReimport";
-            this.btnReimport.Size = new System.Drawing.Size(137, 45);
+            this.btnReimport.Size = new System.Drawing.Size(75, 23);
             this.btnReimport.TabIndex = 7;
             this.btnReimport.Text = "Reimport";
             this.btnReimport.UseVisualStyleBackColor = true;
@@ -359,11 +342,12 @@ private void InitializeComponent()
             this.comboBoxLowcase.DisplayMember = "0";
             this.comboBoxLowcase.DropDownStyle = System.Windows.Forms.ComboBoxStyle.DropDownList;
             this.comboBoxLowcase.FormattingEnabled = true;
-            this.comboBoxLowcase.Items.AddRange(new object[] {"Yes", "No"});
-            this.comboBoxLowcase.Location = new System.Drawing.Point(164, 144);
-            this.comboBoxLowcase.Margin = new System.Windows.Forms.Padding(5, 5, 5, 5);
+            this.comboBoxLowcase.Items.AddRange(new object[] {
+            "Yes",
+            "No"});
+            this.comboBoxLowcase.Location = new System.Drawing.Point(89, 72);
             this.comboBoxLowcase.Name = "comboBoxLowcase";
-            this.comboBoxLowcase.Size = new System.Drawing.Size(272, 32);
+            this.comboBoxLowcase.Size = new System.Drawing.Size(150, 20);
             this.comboBoxLowcase.TabIndex = 5;
             this.comboBoxLowcase.ValueMember = "0";
             // 
@@ -371,11 +355,15 @@ private void InitializeComponent()
             // 
             this.comboBoxHeader.DisplayMember = "0";
             this.comboBoxHeader.FormattingEnabled = true;
-            this.comboBoxHeader.Items.AddRange(new object[] {"2", "3", "4", "5", "6"});
-            this.comboBoxHeader.Location = new System.Drawing.Point(164, 196);
-            this.comboBoxHeader.Margin = new System.Windows.Forms.Padding(5, 5, 5, 5);
+            this.comboBoxHeader.Items.AddRange(new object[] {
+            "2",
+            "3",
+            "4",
+            "5",
+            "6"});
+            this.comboBoxHeader.Location = new System.Drawing.Point(89, 98);
             this.comboBoxHeader.Name = "comboBoxHeader";
-            this.comboBoxHeader.Size = new System.Drawing.Size(272, 32);
+            this.comboBoxHeader.Size = new System.Drawing.Size(150, 20);
             this.comboBoxHeader.TabIndex = 3;
             this.comboBoxHeader.ValueMember = "0";
             // 
@@ -384,10 +372,9 @@ private void InitializeComponent()
             this.comboBoxEncoding.DisplayMember = "0";
             this.comboBoxEncoding.DropDownStyle = System.Windows.Forms.ComboBoxStyle.DropDownList;
             this.comboBoxEncoding.FormattingEnabled = true;
-            this.comboBoxEncoding.Location = new System.Drawing.Point(164, 92);
-            this.comboBoxEncoding.Margin = new System.Windows.Forms.Padding(5, 5, 5, 5);
+            this.comboBoxEncoding.Location = new System.Drawing.Point(89, 46);
             this.comboBoxEncoding.Name = "comboBoxEncoding";
-            this.comboBoxEncoding.Size = new System.Drawing.Size(272, 32);
+            this.comboBoxEncoding.Size = new System.Drawing.Size(150, 20);
             this.comboBoxEncoding.TabIndex = 0;
             this.comboBoxEncoding.ValueMember = "0";
             // 
@@ -396,11 +383,12 @@ private void InitializeComponent()
             this.comboBoxType.DisplayMember = "0";
             this.comboBoxType.DropDownStyle = System.Windows.Forms.ComboBoxStyle.DropDownList;
             this.comboBoxType.FormattingEnabled = true;
-            this.comboBoxType.Items.AddRange(new object[] {"Array", "Dict Object"});
-            this.comboBoxType.Location = new System.Drawing.Point(164, 40);
-            this.comboBoxType.Margin = new System.Windows.Forms.Padding(5, 5, 5, 5);
+            this.comboBoxType.Items.AddRange(new object[] {
+            "Array",
+            "Dict Object"});
+            this.comboBoxType.Location = new System.Drawing.Point(89, 20);
             this.comboBoxType.Name = "comboBoxType";
-            this.comboBoxType.Size = new System.Drawing.Size(272, 32);
+            this.comboBoxType.Size = new System.Drawing.Size(150, 20);
             this.comboBoxType.TabIndex = 0;
             this.comboBoxType.ValueMember = "0";
             // 
@@ -409,19 +397,17 @@ private void InitializeComponent()
             this.tabControlCode.Controls.Add(this.tabPageJSON);
             this.tabControlCode.Dock = System.Windows.Forms.DockStyle.Fill;
             this.tabControlCode.Location = new System.Drawing.Point(0, 0);
-            this.tabControlCode.Margin = new System.Windows.Forms.Padding(5, 5, 5, 5);
             this.tabControlCode.Name = "tabControlCode";
             this.tabControlCode.SelectedIndex = 0;
-            this.tabControlCode.Size = new System.Drawing.Size(1167, 1038);
+            this.tabControlCode.Size = new System.Drawing.Size(517, 490);
             this.tabControlCode.TabIndex = 0;
             // 
             // tabPageJSON
             // 
-            this.tabPageJSON.Location = new System.Drawing.Point(4, 33);
-            this.tabPageJSON.Margin = new System.Windows.Forms.Padding(5, 5, 5, 5);
+            this.tabPageJSON.Location = new System.Drawing.Point(4, 22);
             this.tabPageJSON.Name = "tabPageJSON";
-            this.tabPageJSON.Padding = new System.Windows.Forms.Padding(5, 5, 5, 5);
-            this.tabPageJSON.Size = new System.Drawing.Size(1159, 1001);
+            this.tabPageJSON.Padding = new System.Windows.Forms.Padding(3);
+            this.tabPageJSON.Size = new System.Drawing.Size(509, 464);
             this.tabPageJSON.TabIndex = 0;
             this.tabPageJSON.Text = "JSON";
             this.tabPageJSON.UseVisualStyleBackColor = true;
@@ -429,17 +415,15 @@ private void InitializeComponent()
             // backgroundWorker
             // 
             this.backgroundWorker.DoWork += new System.ComponentModel.DoWorkEventHandler(this.backgroundWorker_DoWork);
-            this.backgroundWorker.RunWorkerCompleted +=
-                new System.ComponentModel.RunWorkerCompletedEventHandler(this.backgroundWorker_RunWorkerCompleted);
+            this.backgroundWorker.RunWorkerCompleted += new System.ComponentModel.RunWorkerCompletedEventHandler(this.backgroundWorker_RunWorkerCompleted);
             // 
             // label6
             // 
-            label6.Location = new System.Drawing.Point(11, 306);
-            label6.Margin = new System.Windows.Forms.Padding(5, 0, 5, 0);
+            label6.Location = new System.Drawing.Point(6, 153);
             label6.Name = "label6";
-            label6.Size = new System.Drawing.Size(142, 24);
+            label6.Size = new System.Drawing.Size(77, 12);
             label6.TabIndex = 11;
-            label6.Text = "Sheet Name:";
+            label6.Text = "SheetName:";
             label6.TextAlign = System.Drawing.ContentAlignment.MiddleRight;
             // 
             // comboBoxSheetName
@@ -447,25 +431,25 @@ private void InitializeComponent()
             this.comboBoxSheetName.DisplayMember = "0";
             this.comboBoxSheetName.DropDownStyle = System.Windows.Forms.ComboBoxStyle.DropDownList;
             this.comboBoxSheetName.FormattingEnabled = true;
-            this.comboBoxSheetName.Items.AddRange(new object[] {"Yes", "No"});
-            this.comboBoxSheetName.Location = new System.Drawing.Point(164, 301);
-            this.comboBoxSheetName.Margin = new System.Windows.Forms.Padding(5);
+            this.comboBoxSheetName.Items.AddRange(new object[] {
+            "Yes",
+            "No"});
+            this.comboBoxSheetName.Location = new System.Drawing.Point(89, 150);
             this.comboBoxSheetName.Name = "comboBoxSheetName";
-            this.comboBoxSheetName.Size = new System.Drawing.Size(272, 32);
+            this.comboBoxSheetName.Size = new System.Drawing.Size(150, 20);
             this.comboBoxSheetName.TabIndex = 10;
             this.comboBoxSheetName.ValueMember = "0";
             // 
             // MainForm
             // 
-            this.AutoScaleDimensions = new System.Drawing.SizeF(11F, 24F);
+            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
             this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
-            this.ClientSize = new System.Drawing.Size(1437, 1124);
+            this.ClientSize = new System.Drawing.Size(784, 562);
             this.Controls.Add(this.splitContainer1);
             this.Controls.Add(this.toolStrip);
             this.Controls.Add(this.statusStrip);
-            this.Icon = ((System.Drawing.Icon) (resources.GetObject("$this.Icon")));
-            this.Margin = new System.Windows.Forms.Padding(5, 5, 5, 5);
-            this.MinimumSize = new System.Drawing.Size(1448, 1144);
+            this.Icon = ((System.Drawing.Icon)(resources.GetObject("$this.Icon")));
+            this.MinimumSize = new System.Drawing.Size(800, 600);
             this.Name = "MainForm";
             this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
             this.Text = "excel2json";
@@ -475,46 +459,47 @@ private void InitializeComponent()
             this.toolStrip.PerformLayout();
             this.splitContainer1.Panel1.ResumeLayout(false);
             this.splitContainer1.Panel2.ResumeLayout(false);
-            ((System.ComponentModel.ISupportInitialize) (this.splitContainer1)).EndInit();
+            ((System.ComponentModel.ISupportInitialize)(this.splitContainer1)).EndInit();
             this.splitContainer1.ResumeLayout(false);
             this.flowLayoutPanel1.ResumeLayout(false);
             this.flowLayoutPanel1.PerformLayout();
             this.panelExcelDropBox.ResumeLayout(false);
             this.flowLayoutPanel2.ResumeLayout(false);
-            ((System.ComponentModel.ISupportInitialize) (this.pictureBoxExcel)).EndInit();
+            ((System.ComponentModel.ISupportInitialize)(this.pictureBoxExcel)).EndInit();
             this.groupBox1.ResumeLayout(false);
             this.groupBox1.PerformLayout();
             this.tabControlCode.ResumeLayout(false);
             this.ResumeLayout(false);
             this.PerformLayout();
-        }
 
-        #endregion
-        private System.Windows.Forms.StatusStrip statusStrip;
-        private System.Windows.Forms.ToolStripStatusLabel statusLabel;
-        private System.Windows.Forms.ToolStrip toolStrip;
-        private System.Windows.Forms.ToolStripButton btnImportExcel;
-        private System.Windows.Forms.ToolStripSeparator toolStripSeparator2;
-        private System.Windows.Forms.ToolStripButton btnHelp;
-        private System.Windows.Forms.SplitContainer splitContainer1;
-        private System.Windows.Forms.ToolStripButton btnCopyJSON;
-        private System.Windows.Forms.FlowLayoutPanel flowLayoutPanel1;
-        private System.Windows.Forms.Panel panelExcelDropBox;
-        private System.Windows.Forms.FlowLayoutPanel flowLayoutPanel2;
-        private System.Windows.Forms.PictureBox pictureBoxExcel;
-        private System.Windows.Forms.Label labelExcelFile;
-        private System.Windows.Forms.GroupBox groupBox1;
-        private System.Windows.Forms.ComboBox comboBoxEncoding;
-        private System.Windows.Forms.ComboBox comboBoxType;
-        private System.Windows.Forms.ComboBox comboBoxLowcase;
-        private System.Windows.Forms.ComboBox comboBoxHeader;
-        private System.ComponentModel.BackgroundWorker backgroundWorker;
-        private System.Windows.Forms.ToolStripButton btnSaveJson;
-        private System.Windows.Forms.ToolStripSeparator toolStripSeparator1;
+        }
+
+        #endregion
+        private System.Windows.Forms.StatusStrip statusStrip;
+        private System.Windows.Forms.ToolStripStatusLabel statusLabel;
+        private System.Windows.Forms.ToolStrip toolStrip;
+        private System.Windows.Forms.ToolStripButton btnImportExcel;
+        private System.Windows.Forms.ToolStripSeparator toolStripSeparator2;
+        private System.Windows.Forms.ToolStripButton btnHelp;
+        private System.Windows.Forms.SplitContainer splitContainer1;
+        private System.Windows.Forms.ToolStripButton btnCopyJSON;
+        private System.Windows.Forms.FlowLayoutPanel flowLayoutPanel1;
+        private System.Windows.Forms.Panel panelExcelDropBox;
+        private System.Windows.Forms.FlowLayoutPanel flowLayoutPanel2;
+        private System.Windows.Forms.PictureBox pictureBoxExcel;
+        private System.Windows.Forms.Label labelExcelFile;
+        private System.Windows.Forms.GroupBox groupBox1;
+        private System.Windows.Forms.ComboBox comboBoxEncoding;
+        private System.Windows.Forms.ComboBox comboBoxType;
+        private System.Windows.Forms.ComboBox comboBoxLowcase;
+        private System.Windows.Forms.ComboBox comboBoxHeader;
+        private System.ComponentModel.BackgroundWorker backgroundWorker;
+        private System.Windows.Forms.ToolStripButton btnSaveJson;
+        private System.Windows.Forms.ToolStripSeparator toolStripSeparator1;
         private System.Windows.Forms.Button btnReimport;
         private System.Windows.Forms.TabControl tabControlCode;
         private System.Windows.Forms.TabPage tabPageJSON;
         private System.Windows.Forms.ComboBox comboBoxDateFormat;
         private System.Windows.Forms.ComboBox comboBoxSheetName;
-    }
+    }
 }
\ No newline at end of file
diff --git a/JsonExporter.cs b/JsonExporter.cs
index 89e6cd8..ae61560 100644
--- a/JsonExporter.cs
+++ b/JsonExporter.cs
@@ -95,7 +95,8 @@ private object convertSheetToDict(DataTable sheet, bool lowcase) {
                     ID = string.Format("row_{0}", i);
 
                 var rowObject = convertRowToDict(sheet, row, lowcase, firstDataRow);
-                rowObject[ID] = ID;
+                // 多余的字段
+                // rowObject[ID] = ID;
                 importData[ID] = rowObject;
             }