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DoubleAnimation Loop for 30 seconds

<Window x:Class="WpfApplication1.MainWindow"     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"     Title="AnimatedLabel" Height="498" Width="530" WindowStartupLocation="CenterScreen" >   <StackPanel>     <Button Content ="Animate Height" Click ="btnAnimatelblMessage_Click" />     <Label Name ="lblHeight"  Content ="Animate Height!"/>     <Button Content ="Animate Transparency" Click ="btnAnimatelblTransparency_Click"/>     <Label Background ="Cornsilk" Name ="lblTransparency"  Content ="Animate Transparency!"/>   </StackPanel> </Window> //File:Window.xaml.cs using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Windows; using System.Windows.Controls; using System.Windows.Data; using System.Windows.Documents; using System.Windows.Input; using System.Windows.Media; using System.Windows.Media.Imaging; using System.Windows.Navigation; using System.Windows.Shapes; using System.Windows.Media.Animation; namespace WpfApplication1 {   public partial class MainWindow : Window   {     public MainWindow()     {       InitializeComponent();     }     protected void btnAnimatelblMessage_Click(object sender, RoutedEventArgs args)     {       DoubleAnimation dblAnim = new DoubleAnimation();       dblAnim.From = 40;       dblAnim.To = 200;       dblAnim.AutoReverse = true;       dblAnim.RepeatBehavior = new RepeatBehavior(TimeSpan.FromSeconds(30));       dblAnim.Duration = new Duration(TimeSpan.FromSeconds(4));       lblHeight.BeginAnimation(Label.HeightProperty, dblAnim);     }     protected void btnAnimatelblTransparency_Click(object sender, RoutedEventArgs args)     {       DoubleAnimation dblAnim = new DoubleAnimation();       dblAnim.From = 1.0;       dblAnim.To = 0.0;       dblAnim.Duration = new Duration(TimeSpan.FromSeconds(10));       lblTransparency.BeginAnimation(Label.OpacityProperty, dblAnim);     }   } }