namespace Example {
    /// <summary>
    /// Interaction logic for OMG.xaml
    /// </summary>
    public partial class OMG : Window {
        public Window1() {
            InitializeComponent();
            this.label1.MouseEnter +=new MouseEventHandler(label1_MouseEnter);
            this.label1.MouseLeave +=new MouseEventHandler(label1_MouseLeave);
           
        }

        void label1_MouseLeave(object sender, MouseEventArgs e) {
            this.label1.Background = Brushes.Black;
        }

        void label1_MouseEnter(object sender, MouseEventArgs e) {
            this.label1.Background = Brushes.White;
        }
    }
}