TcpListener Async Calling

// Thread signal.
public static ManualResetEvent tcpClientConnected = 
    new ManualResetEvent(false);

// Accept one client connection asynchronously.
public static void DoBeginAcceptTcpClient(TcpListener 
    listener)
{
    // Set the event to nonsignaled state.
    tcpClientConnected.Reset();

    // Start to listen for connections from a client.
    Console.WriteLine("Waiting for a connection...");

    // Accept the connection. 
    // BeginAcceptSocket() creates the accepted socket.
    listener.BeginAcceptTcpClient(
        new AsyncCallback(DoAcceptTcpClientCallback), 
        listener);

    // Wait until a connection is made and processed before 
    // continuing.
    tcpClientConnected.WaitOne();
}

// Process the client connection.
public static void DoAcceptTcpClientCallback(IAsyncResult ar) 
{
    // Get the listener that handles the client request.
    TcpListener listener = (TcpListener) ar.AsyncState;
    
    // End the operation and display the received data on 
    // the console.
    TcpClient client = listener.EndAcceptTcpClient(ar);
    
    // Process the connection here. (Add the client to a
    // server table, read data, etc.)
    Console.WriteLine("Client connected completed");

    // Signal the calling thread to continue.
    tcpClientConnected.Set();

}