how to get stopwatch start time

Stopwatch.Start() starts the stopwatch.
To get the time elapsed you would need to access Elapsed property. Elapsed property returns the Timespan Type. Which you can use to get the value in different formats i.e. Days, Seconds, Milliseconds.

Stopwatch watch = new Stopwatch();
watch.Start();
//call some operation/method
Timespan ts = watch.Elapsed;
int ms = ts.Seconds;

Thanks
- HTH
Nilesh