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Time span - negative value

Hi,

I need a help to calculate elapsed time (start time -end time).
I used the following code in windows apps. it's Working perfectly.

But, when i use the same in Pocket PC apps,getting some negative result.
I've tested it in Pocket PC Emulator.(VS2003)

Code:

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
ck = DateTime.Now
Timer2.Enabled = True
End Sub

Private Sub Timer2_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer2.Tick
Timer2.Enabled = False
ck1 = DateTime.Now
ck3 = ck1.Subtract(ck)
Label5.Text = String.Format("{00:d2}:{01:d2}", ck3.Minutes, ck3.Seconds)
Timer2.Enabled = True
End Sub


Where Ck,ck1 are datetime variables.
Ck3 timespan variable.

Can anyone advice me to solve this?

Thank YOu!
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