How to change the background image of button on runtime?

Question

I m stuck with a problem. I want to change the background image of button on runtime. I got the solution for changing the color but i want to change the image.

The code is as follows

public void buttonCase(object sender, RoutedEventArgs e)
{
    Uri uri = null;
    var image = new ImageBrush();
    if (((App)App.Current).appControler.m_Mode == Controller.textMode.Letters)
    {
        ((App)App.Current).appControler.buttonCase(sender, e);
        switch (((App)App.Current).appControler.m_case)
        {
        case Controller.caseMode.Upper:
            b0.FontSize = b1.FontSize = b2.FontSize = b3.FontSize = b4.FontSize = b5.FontSize = b6.FontSize = b7.FontSize
            = b8.FontSize = b9.FontSize = bCornerLower.FontSize = 30.0;
            uri = new Uri(@"/SourceCode;component/Images/Lower_Case_p.png", UriKind.Relative);
            image.ImageSource = new BitmapImage(uri);
            btnCase.Background = image;
            break;
        case Controller.caseMode.Lower:
            b0.FontSize = b1.FontSize = b2.FontSize = b3.FontSize = b4.FontSize = b5.FontSize = b6.FontSize = b7.FontSize
            = b8.FontSize = b9.FontSize = bCornerLower.FontSize = 40.0;
            uri = new Uri(@"/SourceCode;component/Images/Case_p.png", UriKind.Relative);
            image.ImageSource = new BitmapImage(uri);
            btnCase.Background = image;
            break;
        }
    }
}  

Answer 1

Something like this?

var brush = new ImageBrush();
brush.ImageSource = new BitmapImage(new Uri(@"Images/myImage.png", UriKind.Relative)); 
myButton.Background = brush;

[Edit] I made a test application with two images. I toggle the image on button click and it works.

private bool flag;

private void button1_Click(object sender, RoutedEventArgs e)
{
    flag = !flag;

    var uriString = flag ? @"Images/logo.png" : @"Images/icon.png";
    myButton.Background = new ImageBrush 
        { ImageSource = new BitmapImage(new Uri(uriString, UriKind.Relative)) };
}