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HtmlEditorExtender image upload error

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hi

i'm using an ajax control toolkit HtmlEditorExtender for providing html dynamic page

but when i try to upload image in it upload erro occures

here is code

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default2.aspx.cs" Inherits="Default2" %><%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="AjaxControlToolkit" %><%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit.HTMLEditor" TagPrefix="cc1" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head runat="server"><title></title></head><body><form id="form1" runat="server"><asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager><asp:TextBox ID="replyBody" runat="server" TextMode="MultiLine" Rows="10" Columns="30"/><AjaxToolkit:HtmlEditorExtender ID="replyBody_HtmlEditorExtender" TargetControlID="replyBody"
        DisplaySourceTab="true" OnImageUploadComplete="replyBody_HtmlEditorExtender_ImageUploadComplete"
        ClientIDMode="AutoID" EnableSanitization="true" runat="server"><Toolbar><AjaxToolkit:Undo /><AjaxToolkit:Redo /><AjaxToolkit:Bold /><AjaxToolkit:Italic /><AjaxToolkit:Underline /><AjaxToolkit:StrikeThrough /><AjaxToolkit:Subscript /><AjaxToolkit:Superscript /><AjaxToolkit:JustifyLeft /><AjaxToolkit:JustifyCenter /><AjaxToolkit:JustifyRight /><AjaxToolkit:JustifyFull /><AjaxToolkit:InsertOrderedList /><AjaxToolkit:InsertUnorderedList /><AjaxToolkit:CreateLink /><AjaxToolkit:UnLink /><AjaxToolkit:RemoveFormat /><AjaxToolkit:SelectAll /><AjaxToolkit:UnSelect /><AjaxToolkit:Delete /><AjaxToolkit:Cut /><AjaxToolkit:Copy /><AjaxToolkit:Paste /><AjaxToolkit:BackgroundColorSelector /><AjaxToolkit:ForeColorSelector /><AjaxToolkit:FontNameSelector /><AjaxToolkit:FontSizeSelector /><AjaxToolkit:Indent /><AjaxToolkit:Outdent /><AjaxToolkit:InsertHorizontalRule /><AjaxToolkit:HorizontalSeparator /><AjaxToolkit:InsertImage /></Toolbar></AjaxToolkit:HtmlEditorExtender></form></body></html>

and this is the code behind

using System;
using AjaxControlToolkit;


public partial class Default2 : System.Web.UI.Page
{
    protected void replyBody_HtmlEditorExtender_ImageUploadComplete(object sender, AjaxFileUploadEventArgs e)
    {
        string fullPath = "~/Images/Upload_test/" + e.FileName;
        replyBody_HtmlEditorExtender.AjaxFileUpload.SaveAs(Server.MapPath(fullPath));
        e.PostedUrl = fullPath;

    }
    protected void Page_Load(object sender, EventArgs e)
    {
       replyBody_HtmlEditorExtender.AjaxFileUpload.AllowedFileTypes = "jpg,jpeg";
    }
}

when i want to uload an image, this error occures

error

please help me


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