System.Net.Security.NegotiateStream.BeginAuthenticateAsServer C# (CSharp) Метод

        public virtual IAsyncResult BeginAuthenticateAsServer(
            NetworkCredential credential,
            ExtendedProtectionPolicy policy,
            ProtectionLevel requiredProtectionLevel,
            TokenImpersonationLevel requiredImpersonationLevel,
            AsyncCallback asyncCallback,
            object asyncState)
        {
#if DEBUG
            using (DebugThreadTracking.SetThreadKind(ThreadKinds.User | ThreadKinds.Async))
            {
#endif
                _negoState.ValidateCreateContext(_package, credential, string.Empty, policy, requiredProtectionLevel, requiredImpersonationLevel);

                LazyAsyncResult result = new LazyAsyncResult(_negoState, asyncState, asyncCallback);
                _negoState.ProcessAuthentication(result);

                return result;
#if DEBUG
            }
#endif
        }
        //

 private void AcceptCallback(IAsyncResult ar)
 {
     try
     {
         Socket acceptSocket;
         acceptSocket = server.EndAccept(ar);
         nws = new NetworkStream(acceptSocket);
         ns = new NegotiateStream(nws);
         ns.BeginAuthenticateAsServer(AuthCallback, ns);
     }
     catch (Exception e)
     {
         Console.WriteLine(e.Message);
     }
 }