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Asked: 2026-06-13T22:54:32+00:00

If I create a brand new Website project using Visual Studio 2010 dot net

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If I create a brand new Website project using Visual Studio 2010 dot net 4.0 I get this error message if I try to add “using System.Web.Extensions”.

The type or namespace name 'Extensions' does not exist in the namespace 'System.Web'

I do not get the error if I create a website using dot net 3.5

Any searching I have done suggest changing from target platform 4.0 Client Profile to just plain 4.0

But I don’t have Client Profile as an option and C:\Program Files\Reference Assemblies\Microsoft\Framework.NETFramework\v4.0\System.Web.Extensions.dll is on my PC.

Any ideas?

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1 Answer

  1. Editorial Team

    You need to add a reference to System.Web.Extensions in order to use it in your project.

    Adding System.Web.Extensions

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