how to insert a image by clicking a button?

private void Button_Click_1(object sender, RoutedEventArgs e)
        {
            img1.Source = new BitmapImage(new Uri("C:/Users/Sudhir/Documents/VisualStudio2012/Projects/App6/App6/Assets", UriKind.Absolute));
        }

this tho code i used but it is not displaying the image ?

img1 is name of the image box i used