The type or namespace name 'Linq' does not exist in the namespace 'System.Data' (are you missing an assembly reference?)

Problem in Web Config File :-

The type or namespace name 'Linq' does not exist in the namespace 'System.Data' (are you missing an assembly reference?)

Solution:-

Put this piece of code in the Configuration file and it will be solved..

 <compilation debug="false">
          <assemblies>
            <add assembly="System.Core, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
            <add assembly="System.Xml.Linq, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
            <add assembly="System.Design, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
            <add assembly="System.Web.Extensions.Design, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
            <add assembly="System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
           </assemblies>
        </compilation>