检查服务器是否可以在.NET中访问的最佳方法？

I have created a timeclock application in C# that connects to a web service on our server in order to clock employees in/out. The application resides in the system tray and clocks users out if they shut down/suspend their machines or if they are idle for more than three hours to which it clocks them out at the time of last activity.I have created a timeclock application in C# th