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| Title | Measure elapsed time in VB .NET |
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| Keywords | VB.NET, elapsed time, time, timer function, seconds |
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| Categories | Software Engineering, Tips and Tricks |
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Declare two DateTime variables for the start and stop times. Set their values using the Now function when the operation starts and stops.
Use the stop time variables's Subtract method to subtract the start time and obtain a result of type TimeSpan. Use the TimeSpan's TotalSeconds method to get the total number of seconds as a Double. (The Seconds method returns the whole number of seconds in the TimeSpan.) Use the resulting Double's ToString method to turn the result into a string.
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Private Sub btnStart_Click(ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles btnStart.Click
Static start_time As DateTime
Static stop_time As DateTime
Dim elapsed_time As TimeSpan
If btnStart.Text = "Start" Then
lblElapsed.Text = ""
start_time = Now
btnStart.Text = "Stop"
Else
stop_time = Now
elapsed_time = stop_time.Subtract(start_time)
lblElapsed.Text = _
elapsed_time.TotalSeconds.ToString("0.000000")
btnStart.Text = "Start"
End If
End Sub
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