Use "Stopwatch" class to calculate the execution time
Although this class is not famous, it does a great job to calculate the execution time. Usually, the execution time of a code block is calculated by setting a start and stop variable (DateTime) just before and after the code block and then calculating the difference between "start" and "stop" variable by substracting the "start" from the "stop". Yes, this does the work but why using that when you have a Stopwatch class which does exactly what is needed? I will not provide a sample code here because the related MSDN article is pretty clear and has a good sample code snippet, which explains the basics. Please see http://msdn.microsoft.com/en-us/library/system.diagnostics.stopwatch.aspx for the details.