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

Monday

ASP.NET:The type or namespace name 'Linq' does not exist in the namespace 'System' (are you missing an assembly reference?):
                        You probably need to add a reference (System.Core) to fix this issue. Below the steps for add System.Core references in to your project.

                                             
Add System.Core reference in ASP.NET

•     Right click on the Bin (or) /Library/References folder in the Solution Explorer
•     Choose Add Reference
•     Click the .NET tab and scroll down to System.Core
•      Click OK to add the new reference

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