Parser Error Message: Could not load file or assembly 'System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'

Solution

If Your Using Ajax Extension In Your Project Then you have to Add This following Dll To Your Project Bin folder System.Web.Extensions.Design.dllSystem.Web.Extensions.dll,because it may not be installed in the server where you are hosting your project,thats why you are getting the following Parser Error Message.

Line 63:   </httpHandlers>
Line 64:   <httpModules>
Line 65:         <add name="ScriptModule" type="System.Web.Handlers.ScriptModule, 
System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, 
PublicKeyToken=31bf3856ad364e35"/>
Line 66:   </httpModules>
Line 67: