Check if port is open or not using C#

Description:

System.Net.Sockets.Socket class can be used for Socket Programming. Same class can be used to check if a particular port is open on a particular machine or not. Following code can check this:

static bool TestForOpenPort(string host, int port)

{

    Socket s = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);

    try

    {

        s.Connect(host, port);

        return true;

    }

    catch (SocketException)

    {

        return false;

    }

    finally

    {

        ((IDisposable)s).Dispose();

    }

}

Here host is Machine Name or IP Address.