net481 
namespace System.Web.Security
{
    public sealed class FormsAuthentication
    {
        [Obsolete("The recommended alternative is to use the Membership APIs, such as Membership.ValidateUser. For more information, see http://go.microsoft.com/fwlink/?LinkId=252463.")]
        public static bool Authenticate(string name, string password);
    }
}
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.NET Framework 1.01.12.03.03.54.04.54.5.14.5.24.64.6.14.6.24.74.7.14.7.24.84.8.1
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.

Obsolete The recommended alternative is to use the Membership APIs, such as Membership.ValidateUser. For more information, see http://go.microsoft.com/fwlink/?LinkId=252463.
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