private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            DoubleAnimation da = new DoubleAnimation(360, 0, new Duration(TimeSpan.FromSeconds(3)));
            RotateTransform rt = new RotateTransform();
            image1.RenderTransform = rt;
            image1.RenderTransformOrigin = new Point(0.5, 0.5);
            da.RepeatBehavior = RepeatBehavior.Forever;
            rt.BeginAnimation(RotateTransform.AngleProperty, da);
        }

<Window x:Class="WpfApplication1.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window1" Height="300" Width="300" Loaded="Window_Loaded">
    <Grid>
        <Image Margin="41,30,38,35" Name="image1" Stretch="Fill" Source="file:///E:\Downloads\WpfApplication2\WpfApplication1\wheel.png" IsEnabled="True" StretchDirection="Both" />
    </Grid>
</Window>