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Event Dispatcher Timer

<UserControl x:Class='SilverlightApplication3.MainPage'     xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'      xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'     xmlns:d='http://schemas.microsoft.com/expression/blend/2008'      xmlns:mc='http://schemas.openxmlformats.org/markup-compatibility/2006'      mc:Ignorable='d'      d:DesignWidth='640'      d:DesignHeight='480'>     <Grid x:Name="LayoutRoot" Background="White" ShowGridLines="True">         <Grid.ColumnDefinitions>             <ColumnDefinition />         </Grid.ColumnDefinitions>         <Grid.RowDefinitions>             <RowDefinition />         </Grid.RowDefinitions>         <StackPanel Grid.Column="0"                     Grid.Row="0"                      HorizontalAlignment="Left">             <TextBlock x:Name="tbElapsedTime"                    FontSize="10"                    Text="0"/>             <Button x:Name="btnStart"                 Content="Start"                 Height="20"                 Width="100"                 Click="btnStart_Click" />             <Button x:Name="btnStop"                 Content="Stop"                 Height="20"                 Width="100"                 Click="btnStop_Click" />             <Button x:Name="btnReset"                 Content="Reset"                  Height="20"                 Width="100"                  Click="btnReset_Click" />         </StackPanel>     </Grid> </UserControl> //File: Page.cs using System; using System.Collections.Generic; using System.Linq; using System.Net; using System.Windows; using System.Windows.Controls; using System.Windows.Documents; using System.Windows.Input; using System.Windows.Media; using System.Windows.Media.Animation; using System.Windows.Shapes; using System.Windows.Threading; namespace SilverlightApplication3 {     public partial class MainPage : UserControl     {         DispatcherTimer timer = new DispatcherTimer();         public MainPage()         {             InitializeComponent();             timer.Interval = new TimeSpan(0, 0, 1);             timer.Tick += new EventHandler(timer_Tick);         }         void timer_Tick(object sender, EventArgs e)         {             int currentElapsedSeconds = int.Parse(tbElapsedTime.Text);             currentElapsedSeconds++;             tbElapsedTime.Text = currentElapsedSeconds.ToString();         }         private void btnStart_Click(object sender, RoutedEventArgs e)         {             timer.Start();         }         private void btnStop_Click(object sender, RoutedEventArgs e)         {             timer.Stop();         }         private void btnReset_Click(object sender, RoutedEventArgs e)         {             tbElapsedTime.Text = "0";         }     } }