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Using HttpUtility in Visual C# is invalid, even if the namespace System.Web is added because System.Web.dll needs to be added to the reference. But there is no System.Web.dll Please switch to the Browse tab at C:WindowsMicrosoft.NETFramework2.0.50727 directory, where v2.0.50727 is the version of .NET you are actually using. (It must be this, invalid under the 4.0 directory)
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