<Window x:Class="WpfApplication1.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="mouseEnterLeave" Height="400" Width="500"> <StackPanel> <Border MouseEnter="OnMouseEnterHandler" MouseLeave="OnMouseLeaveHandler" Name="border1" Margin="10" BorderThickness="1" BorderBrush="Black" VerticalAlignment="Center" Width="300" Height="100"> <Label Margin="10" FontSize="14" HorizontalAlignment="Center">Move Cursor Over Me</Label> </Border> </StackPanel> </Window> //File:Window.xaml.cs using System; using System.Windows; using System.Windows.Controls; using System.Windows.Input; using System.Windows.Media; namespace WpfApplication1 { public partial class Window1 : Window { public Window1() { InitializeComponent(); } void OnMouseEnterHandler(object sender, MouseEventArgs e) { border1.Background = Brushes.Red; } void OnMouseLeaveHandler(object sender, MouseEventArgs e) { border1.Background = Brushes.White; } } }