Stopwatch for time of sorting

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C#

How can I create Stopwatch for Measuring time of sorting?
Does it need another thread?

EDIT: OP wants to show the elapsed time of a sorting operation while it runs.
I need stopwatch like this:
http://www.keithv.com/software/stopwatch/stopwatch.zip[^]

when I press sort button, timer starts and when sorting operation complete the timer stops

also I use this code but it shows time when sorting is finished I need something show time from beginning to end

Stopwatch sw = Stopwatch.StartNew();
sw.Start();

// something happen

sw.Stop();