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:Animation"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    <Grid x:Name="gridTest">
        <StackPanel x:Name="stkHeaderBar" Grid.Row="0"
         Orientation="Horizontal" FlowDirection="RightToLeft">
            <Button x:Name="btnChangeImg" Content="Change Image"
             Click="btnChangeImage_Click"/>
            <Image x:Name="img"></Image>
        </StackPanel>
    </Grid>

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;
using System.Windows.Threading;
namespace Animation
    public partial class MainWindow : Window
        public MainWindow()
            InitializeComponent();
        private void btnChangeImage_Click(object sender, RoutedEventArgs e)
            DoubleAnimation fadeIn = new DoubleAnimation
                From = 0,
                To = 1,
                Duration = TimeSpan.FromSeconds(2)
            DoubleAnimation fadeOut = new DoubleAnimation
                From = 1,
                Duration = TimeSpan.FromSeconds(2),
            fadeOut.Completed += (o, e) =>
                img.Source = new BitmapImage(new Uri(@"C:\images.jpg"));
                img.BeginAnimation(OpacityProperty, fadeIn);
            fadeIn.Completed += (o, e) =>
                img.Source = new BitmapImage(new Uri(@"C:\images.jpg"));
                img.BeginAnimation(OpacityProperty, fadeOut);
            img.Source = new BitmapImage(new Uri(@"C:\images1.jpg"));
            img.BeginAnimation(OpacityProperty, fadeIn);
}