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Webslider not working with Version 9.1

Hi friends,

    I am using Version 9.1.20091.1015, When I include WebSlider from Infragistics ToolBox.

   Code as below.

    I'm getting the following Error:

     "Could not load type 'System.Web.UI.ScriptReferenceBase' from assembly 'System.Web.Extensions,

      Version=, Culture=neutral, PublicKeyToken=31bf3856ad364e35'"

 Could any help me to get out of this problem. Thnks in advance...




<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="_Default" %>



@ Register Assembly="Infragistics35.Web.v9.1, Version=9.1.20091.1015, Culture=neutral, PublicKeyToken=7dd5c3163f2cd0cb"

Namespace="Infragistics.Web.UI.EditorControls" TagPrefix="ig" %>












/form >


body >
 <ig:WebSlider ID="WebSlider1" runat ="server"> </ig:WebSlider >


</div >
<div ><asp:ScriptManager ID="ScriptManager1" runat ="server"></asp:ScriptManager >DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "">


html xmlns =""> <head runat ="server"><title>Untitled Page</title >


head >


body ><form id="form1" runat ="server">



</html >