How to know when was Windows started or shutdown?

Question

I need to develop a program in C# find out when was Windows started or shutdown.

Is there a log file that I can read to know Windows start and shutdown times? Or do

Answer 1

You could use the "System Up Time" performance counter to get the start time of the system:

 PerformanceCounter systemUpTime = new PerformanceCounter("System", "System Up Time");

 systemUpTime.NextValue();
 TimeSpan upTimeSpan = TimeSpan.FromSeconds(systemUpTime.NextValue());
 Console.Out.WriteLine(DateTime.Now.Subtract(upTimeSpan).ToShortTimeString());

Hope, this helps.