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string iptext = lIP.Text;
string porttext = lPort.Text;
Socket connection = null;
try
{
    IPAddress ip = IPAddress.Parse(iptext);
    IPEndPoint ipEnd = new IPEndPoint(ip, Convert.ToInt32(porttext));
    connection = new Socket(ipEnd.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
    connection.Connect(ipEnd);
    if (connection.Connected)
    {
         ConnectionTA.Text = "Connection with " + iptext + " on Port " + porttext + " established!";
         connection.Close();
    }
}
catch (Exception esc)
{
    ConnectionTA.Text = "Exception:\r\n" + esc.Message;
}

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string iptext = "123.123.123.123";
string porttext = "123";