WPF DoubleAnimation RepeatBehavior,Duration,SpeedRation,AutoReverse

//xaml
<Window x:Class="WpfApp114.MainWindow"
        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"
        xmlns:local="clr-namespace:WpfApp114"
        WindowState="Maximized"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    <Canvas>
        <Button x:Name="btn">OK</Button>
    </Canvas>
</Window>


//cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
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.Animation;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace WpfApp114
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            this.Loaded += MainWindow_Loaded;            
        }

        private void MainWindow_Loaded(object sender, RoutedEventArgs e)
        {
            DoubleAnimation doubleAnimation = new DoubleAnimation();
            doubleAnimation.From = 50;
            doubleAnimation.To = this.ActualWidth;
            doubleAnimation.SpeedRatio = 2;
            doubleAnimation.AutoReverse = true;
            doubleAnimation.Duration = new Duration(TimeSpan.Parse("0:0:5"));
            doubleAnimation.RepeatBehavior = RepeatBehavior.Forever;
            btn.BeginAnimation(Button.WidthProperty, doubleAnimation);
        }
    }
}