public SuppliedCredential(string username, string password, string domain)
 {
     _auth = new AuthIdentity
     {
         User           = username,
         UserLength     = username.Length,
         Domain         = domain,
         DomainLength   = domain.Length,
         Password       = password,
         PasswordLength = password.Length,
         Flags          = 0x2 // UNICODE
     };
 }