title: Asp.net Build error?
body: <p>when i run the my asp.net application it is showing this message can u help me.</p>
  
  <p>Could not load file or assembly 'System.Web.Extensions.Design, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified.</p>