Testing Network Connection in C#

Hey, I am trying to make some code to test wheter or not a my computer is connected to a network - this is what I have but it does not work - it always returns true - ie "Connection is alive". // timer initialization System.Windows.Forms.Timer timer = new System.Windows.Forms.Timer(); timer.Interval = 3000; // test in an interval of 3 sec timer.Tick += new System.EventHandler(this.TestForNetwork); timer.Start(); // Timer Tick event protected void TestForNetwork(object sender, System.EventArgs e) { this.listBox1.Items.Add(System.Windows.Forms.SystemInformation.Network ? "Connection is alive" : "Connection lost"); } The computer is connected on an ethernet network not a diap-up connection - does anybody have any idea what I am doing wrong and what I could be doing right!?!? Thanks! John.