I am using the  ASP.NET Ajax Extensions 1.0

 Below is my aspx and codebehind. There is literally nothing on my page.

When I run my page I get a Javascript error 'Sys' is undefined.

 Anyone have any idea why?

<%@ Page Language="C#" MasterPageFile="~/MasterPages/Main.Master" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="_Default" %>

<%@ Register Assembly="System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"

Namespace="System.Web.UI" TagPrefix="asp" %>

<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">

<asp:ScriptManager id="ScriptManager1" runat="server">

</asp:ScriptManager>

<asp:UpdatePanel id="UpdatePanel1" runat="server">

<ContentTemplate>

</ContentTemplate>

</asp:UpdatePanel>

</asp:Content>

Below is my codebehind

using System;

using System.Data;

using System.Configuration;

using System.Collections;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Web.UI.HtmlControls;

public partial class _Default : System.Web.UI.Page

{

protected void Page_Load(object sender, EventArgs e)

{

}

}

Do you have the proper items in your webconfig file?

You need

<add verb="GET" path="ScriptResource.axd" type="Microsoft.Web.Handlers.ScriptResourceHandler" validate="false"/>

in

<system.web>

   <httpHandlers>

Here is my Web.config I still get an the same Javascript error

<?xml version="1.0"?><configuration>

<appSettings/>

<connectionStrings/>

<system.web>

<!--

-->

<httpHandlers>

<add verb="GET" path="ScriptResource.axd" type="Microsoft.Web.Handlers.ScriptResourceHandler" validate="false"/>

</httpHandlers>

<compilation debug="true">

<assemblies>

<add assembly="System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>

<add assembly="System.Design, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>

<add assembly="System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/></assemblies></compilation>

-->

<authentication mode="Windows"/>

-->

</system.web>

</configuration>

1. remove

   <%@ Register Assembly="System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"

   Namespace="System.Web.UI" TagPrefix="asp" %>

2. Add below code  between <system.web> element in web.config

   <pages>

   <controls>

   <add tagPrefix="asp" namespace="System.Web.UI" assembly="System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>

   </controls>

   </pages>

   <compilation debug="false">

   <assemblies>

   <add assembly="System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>

   </assemblies>

   </compilation>

   <httpHandlers>

   <remove verb="*" path="*.asmx"/>

   <add verb="*" path="*.asmx" validate="false" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>

   <add verb="GET,HEAD" path="ScriptResource.axd" type="System.Web.Handlers.ScriptResourceHandler, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" validate="false"/>

   </httpHandlers>

   <httpModules>

   <add name="ScriptModule" type="System.Web.Handlers.ScriptModule, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>

   </httpModules>

   </system.web>

   Good luck