Get time process takes to complete in seconds?

Question

My program runs a batch file in cmd.exe, after it finished I want to display a MessageBox to user saying Finished in #.## seconds,

I'm redirecting CMD output to a textbox using process.BeginOutputReadLine(), this is the code I tried:

if (e.Data == null)
{  
    string time = process.TotalProcessorTime.Seconds.ToString();
    MessageBox.Show("Finished in " + time + " seconds");
}

It took about 7-15 seconds to complete the process, but the MessageBox displayed Finished in 0 seconds.

How do I get the accurate time it took to complete in seconds?

Answer 1

Stopwatch watch = new Stopwatch();
watch.Start();
//Do things
watch.Stop();
Text = watch.Elapsed.TotalSeconds.ToString();

Answer 2

Have you tried process.ExitTime.Subtract(process.StartTime).TotalSeconds?

Edited to add: Note that you will get an exception if you try to use this before the process has exited. Per the documentation for ExitTime, use the HasExited property if you have any doubt as to whether this is the case or not.