Get CounDown Timer usng C#

Here we can get countdown timer, using below code:
'declare count variable

int cntr=0;

'get current date
DateTime today = DateTime.Now;

'get Target Date i,e ()
DateTime targetDate = Convert.ToDateTime("20/15/2012"); //

30 Days to Go

'get the difference date count
TimeSpan diff = targetDate - today;
cntr = diff.Days.ToString();

'show count

lblCountDownTimer.Text = cntr +' Days to go';