net481 
namespace System.Web.UI
{
    public sealed class ClientScriptManager
    {
        public void ValidateEvent(string uniqueId);
    }
}
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.NET Framework
2.03.54.04.54.5.14.5.24.64.6.14.6.24.74.7.14.7.24.84.8.1
Information specific to net481
Assembly

System.Web , Version=4.0.0.0, PublicKeyToken=b03f5f7f11d50a3a

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Your project needs an assembly reference to System.Web.

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