How can we calculate execution time of particular function?

• Create DateTime dtStart = DateTime.Now;
• Call the function you want to test.
• After calling function write DateTime dtEnd = DateTime.Now;
• Now create TimeSpan object to know the difference between starting time and ending time.

          TimeSpan ts = dtEnd - dtStart;


     Example:

     DateTime dtStart = DateTime.Now;
     functionName(params);
     DateTime dtEnd = DateTime.Now;
     TimeSpan ts = dtEnd - dtStart;