The service did not respond to the start or control request in a timely fashion?

In C# you can do like this :

private void KillService()
{
     Process serviceProcess = null;

     try
     {
         serviceProcess = Process.GetCurrentProcess();

          if(null != serviceProcess)
          {
             serviceProcess.Kill();
          }
      }
      catch
      {

      }
}

call this function in onStop with a delay timer

"The service did not respond to the start or control request in a timely fashion"
This issue usually occurs while trying to Install Windows Service, On Install that Windows service starts execution (for what is has been created).

That execution time if is greater than 30 seconds, then the message "The service did not respond to the start or control request in a timely fashion"
flashes on the screen.

Now, to solve this issue, you can do one thing, Create one timer T1 & start that timer on Install of the Windows service & on the Tick event of timer T1 Start Timer T2 and stop Timer T1. On Tick event of Timer T2 start your Process/task for Which Window service is created.