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//Namespace reference
using System;
using System.Diagnostics;

/// <summary>
/// method to measure the execution time of a 
/// task or process.
/// </summary>
/// <param name="num">Number of times to execute the task</param>
/// <returns></returns>
public Hashtable MeasureExecutionTime(int num)
{
    //HashTable instance to hold execution times
    Hashtable time = new Hashtable();
    Stopwatch timer = new Stopwatch();
    try
    {
        //start your StopWatch
        timer.Start();
        for (int i = 1; i < num; i++) 
        { 
            //execute your process or task to be times
        }
        //stop the StopWatch once the processing is complete
        timer.Stop();
        //Add the values to our HashTable
        time.Add("Elapsed: ", timer.Elapsed);
        time.Add("In milliseconds: ", timer.ElapsedMilliseconds);
        time.Add("In timer ticks: ", timer.ElapsedTicks);
    }
    catch (Exception ex)
    {
        time = null;
        MessageBox.Show(ex.Message);
    }
    return time;
}