ServicesControl.Start Method

public static ServiceStatus Start(string serviceName)
 {
     try
     {
         ServiceController service = new ServiceController(serviceName);
         if (service.Status != ServiceControllerStatus.Running)
         {
             service.Start();
             service.WaitForStatus(ServiceControllerStatus.Running,
                 TimeSpan.FromSeconds(6));
             return ServiceStatus.RUNNING;
         }
         else
             return ServiceStatus.ALREADY_RUNNING;
     }
     catch { return ServiceStatus.UNKNOWN_ERROR; }
 }