net481 
namespace System.Web.Helpers
{
    [Obsolete("Use System.Web.HttpRequest.Unvalidated instead.")]
    public static class Validation
    {
        public static string Unvalidated(this HttpRequestBase request, string key);
    }
}
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.NET Framework 4.54.5.14.5.24.64.6.14.6.24.74.7.14.7.24.84.8.1
Information specific to net481
Assembly

System.Web.WebPages , Version=3.0.0.0, PublicKeyToken=31bf3856ad364e35

Referencing

Your project needs a package reference to Microsoft.AspNet.WebPages.

Package Microsoft.AspNet.WebPages (3.3.0) net45
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