net481 
namespace Microsoft.AspNet.Membership.OpenAuth
{
    public static class OpenAuth
    {
        public static bool Login(string providerName, string providerUserId, bool createPersistentCookie);
    }
}
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.NET Framework
4.04.54.5.14.5.24.64.6.14.6.24.74.7.14.7.24.84.8.1
Information specific to net481
Assembly

Microsoft.AspNet.Membership.OpenAuth , Version=1.0.0.0, PublicKeyToken=31bf3856ad364e35

Referencing

Your project needs a package reference to Microsoft.AspNet.Membership.OpenAuth.

Package Microsoft.AspNet.Membership.OpenAuth (2.0.1) net45
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