WebException Constructor

  public class Example
  {
    static ManualResetEvent clientDone = new ManualResetEvent(false);

    public static void Demo(System.Windows.Controls.TextBlock outputBlock)
    {
        SocketAsyncEventArgs socketEventArg = new SocketAsyncEventArgs();
            DnsEndPoint hostEntry = new DnsEndPoint("https://www.contoso.com", 80);

        // Create a socket and connect to the server
        Socket sock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);

        socketEventArg.Completed += new EventHandler<SocketAsyncEventArgs>(SocketEventArg_Completed);

        socketEventArg.RemoteEndPoint = hostEntry;
        socketEventArg.UserToken = sock;
        sock.ConnectAsync(socketEventArg);
        clientDone.WaitOne();
    }

    static void SocketEventArg_Completed(object sender, SocketAsyncEventArgs e)
    {
         if (e.LastOperation == SocketAsyncOperation.Connect) {
           if (e.SocketError == SocketError.Success)
            {
                // Successfully connected to the server

            }
            else
            {
                  // Throw the WebException with no parameters.
                    throw new WebException();
                }
             } 
             // socket operation not a connect!  
         else
            throw new Exception("Invalid operation completed");
    }
  }