' Toggle the Telnet service - 
' If it is started (running, paused, etc), stop the service.
' If it is stopped, start the service.
Dim sc As New ServiceController("Telnet")
Console.WriteLine("The Telnet service status is currently set to {0}", sc.Status)

If sc.Status.Equals(ServiceControllerStatus.Stopped) Or sc.Status.Equals(ServiceControllerStatus.StopPending) Then
   ' Start the service if the current status is stopped.
   Console.WriteLine("Starting the Telnet service...")
   sc.Start()
Else
   ' Stop the service if its status is not set to "Stopped".
   Console.WriteLine("Stopping the Telnet service...")
   sc.Stop()
End If

' Refresh and display the current service status.
sc.Refresh()
Console.WriteLine("The Telnet service status is now set to {0}.", sc.Status)