System.IO.Pipes.NamedPipeServerStream.GetImpersonationUserName C# (CSharp) Method

        public String GetImpersonationUserName()
        {
            CheckWriteOperations();

            StringBuilder userName = new StringBuilder(Interop.Kernel32.CREDUI_MAX_USERNAME_LENGTH + 1);

            if (!Interop.Kernel32.GetNamedPipeHandleState(InternalHandle, IntPtr.Zero, IntPtr.Zero,
                IntPtr.Zero, IntPtr.Zero, userName, userName.Capacity))
            {
                throw WinIOError(Marshal.GetLastWin32Error());
            }

            return userName.ToString();
        }

    private static void ServerThread(object data)
    {
        NamedPipeServerStream pipeServer =
            new NamedPipeServerStream("testpipe", PipeDirection.InOut, numThreads);

        int threadId = Thread.CurrentThread.ManagedThreadId;

        // Wait for a client to connect
        pipeServer.WaitForConnection();

        Console.WriteLine("Client connected on thread[{0}].", threadId);
        try
        {
            // Read the request from the client. Once the client has
            // written to the pipe its security token will be available.

            StreamString ss = new StreamString(pipeServer);

            // Verify our identity to the connected client using a
            // string that the client anticipates.

            ss.WriteString("I am the one true server!");
            string filename = ss.ReadString();

            // Read in the contents of the file while impersonating the client.
            ReadFileToStream fileReader = new ReadFileToStream(ss, filename);

            // Display the name of the user we are impersonating.
            Console.WriteLine("Reading file: {0} on thread[{1}] as user: {2}.",
                filename, threadId, pipeServer.GetImpersonationUserName());
            pipeServer.RunAsClient(fileReader.Start);
        }
        // Catch the IOException that is raised if the pipe is broken
        // or disconnected.
        catch (IOException e)
        {
            Console.WriteLine("ERROR: {0}", e.Message);
        }
        pipeServer.Close();
    }