Server Error in '/' Application.

Compilation Error

Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately.

Compiler Error Message: CS0234: The type or namespace name 'Linq' does not exist in the namespace 'System' (are you missing an assembly reference?)

Source Error:

Line 2:  using System.Data;
Line 3:  using System.Configuration;
Line 4:  using System.Linq;
Line 5:  using System.Web;
Line 6:  using System.Web.Security;

Source File: d:\hosting\2562719\html\App_Code\IRoleAdminView.cs    Line: 4

Version Information: Microsoft .NET Framework Version:2.0.50727.4253; ASP.NET Version:2.0.50727.4252