i am not a windows guy and I do not deal with windows but as we provide vps hositng one of my customer had problems by changing his dot net to version 4
and received the following error

Server Error in ‘/’ Application.

Method ‘get_EnableCdn’ in type ‘System.Web.UI.ScriptManager’ from assembly ‘System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35’ does not have an implementation.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.TypeLoadException: Method ‘get_EnableCdn’ in type ‘System.Web.UI.ScriptManager’ from assembly ‘System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35’ does not have an implementation.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:

[TypeLoadException: Method ‘get_EnableCdn’ in type ‘System.Web.UI.ScriptManager’ from assembly ‘System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35’ does not have an implementation.]
Sample.Web.UI.Compatibility.RequiredFieldValidator.OnInit(EventArgs e) +0
System.Web.UI.Control.InitRecursive(Control namingContainer) +133
System.Web.UI.Control.InitRecursive(Control namingContainer) +421
System.Web.UI.Control.InitRecursive(Control namingContainer) +421
System.Web.UI.Control.AddedControl(Control control, Int32 index) +277
Template_Show.Page_Load(Object sender, EventArgs e) +10340
System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +25
System.Web.UI.Control.LoadRecursive() +71
System.Web.UI.Control.LoadRecursive() +190
System.Web.UI.Control.LoadRecursive() +190
System.Web.UI.Control.LoadRecursive() +190
System.Web.UI.Control.LoadRecursive() +190
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3064

Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.272

I found a very useful and easy fix that was by removing the following code from the very end of my web.config

  <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
    <dependentAssembly>
      <assemblyIdentity name="System.Web.Extensions" publicKeyToken="31bf3856ad364e35"/>
      <bindingRedirect oldVersion="1.0.0.0-1.1.0.0" newVersion="3.5.0.0"/>
    </dependentAssembly>
    <dependentAssembly>
      <assemblyIdentity name="System.Web.Extensions.Design" publicKeyToken="31bf3856ad364e35"/>
      <bindingRedirect oldVersion="1.0.0.0-1.1.0.0" newVersion="3.5.0.0"/>
    </dependentAssembly>
  </assemblyBinding>

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