RotateTransform Animation with Ease wpf C#

In CS file

using System;

using System.Collections.Generic;

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.Media.Animation;

using System.Windows.Shapes;

namespace simple_animation

{

       /// <summary>

       /// Interaction logic for MainWindow.xaml

       /// </summary>

       public partial class MainWindow : Window

       {

              public MainWindow()

              {

                     this.InitializeComponent();

                     // Insert code required on object creation below this point.

              }

              private void Button_Click(object sender, System.Windows.RoutedEventArgs e)

              {

                     // TODO: Add event handler implementation here.

                     var ease = new PowerEase { EasingMode = EasingMode.EaseOut };

                     //DoubleAnimation(FromValue. ToValue, Duration)

                     DoubleAnimation myanimation = new DoubleAnimation

                             (0, 360, new Duration(TimeSpan.FromSeconds(3)));

                     //Adding Power ease to the animation

                     myanimation.EasingFunction = ease;

           

                     RotateTransform rt = new RotateTransform();

                                 

                     //  "img" is Image added in XAML

                     img.RenderTransform = rt;
                     img.RenderTransformOrigin = new Point(0.5, 0.5);

                     rt.BeginAnimation(RotateTransform.AngleProperty, myanimation );

              }

       }

}

XAML

<Window

                xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

                xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

                x:Class="simple_animation.MainWindow"

                x:Name="Window"

                Title="MainWindow"

                Width="640" Height="480">

                <Grid x:Name="LayoutRoot">

                                <Image x:Name="img" Height="128" Source="sync.png" Stretch="Fill"    VerticalAlignment="Top" Margin="287,68,217,0"/>

                                <Button Content="Button" HorizontalAlignment="Left" Height="49" Margin="24,84,0,0" VerticalAlignment="Top" Width="117" Click="Button_Click"/>

                </Grid>

</Window>

===========================================================================

For animating button width Property

// Animate the Button's Width.
            DoubleAnimation myDoubleAnimation = new DoubleAnimation();
            myDoubleAnimation.From = 75;
            myDoubleAnimation.To = 300;
            myDoubleAnimation.Duration =  new Duration(TimeSpan.FromSeconds(5));
            myDoubleAnimation.AutoReverse = true;
            myDoubleAnimation.RepeatBehavior = RepeatBehavior.Forever;

            // Apply the animation to the button's Width property.
            aButton.BeginAnimation(Button.WidthProperty, myDoubleAnimation);