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How to: Create a Timer

Silverlight

To create a timer in Silverlight, use the DispatcherTimer class in the System.Windows.Threading namespace.

The following example shows a simple counter that uses a DispatcherTimer.

Run this sample.

<Grid x:Name="LayoutRoot" Background="White">

  <!-- Just a TextBlock to show the output of the timer. -->
  <TextBlock Loaded="StartTimer" x:Name="myTextBlock" />
</Grid>
    Public Sub StartTimer(ByVal o As Object, ByVal sender As RoutedEventArgs)
        Dim myDispatcherTimer As System.Windows.Threading.DispatcherTimer = New System.Windows.Threading.DispatcherTimer
        myDispatcherTimer.Interval = New TimeSpan(0, 0, 0, 0, 100)
        ' 100 Milliseconds 
        AddHandler myDispatcherTimer.Tick, AddressOf Me.Each_Tick
        myDispatcherTimer.Start
    End Sub

    ' A variable to count with.
    Private i As Integer = 0
    
    ' Raised every 100 miliseconds while the DispatcherTimer is active.
    Public Sub Each_Tick(ByVal o As Object, ByVal sender As EventArgs)
        ("Count up: " + i) = (("Count up: " + i)  _
                    + 1)
        myTextBlock.Text = ("Count up: " + i)
        ToString
    End Sub

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