Fire an event when an element gains and loses focus. : Focus « Windows Presentation Foundation « C# / CSharp Tutorial

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C# / CSharp Tutorial » Windows Presentation Foundation » Focus 
24.165.1.Fire an event when an element gains and loses focus.
<Window x:Class="WpfApplication1.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:custom="clr-namespace:WpfApplication1"  
    Title="gotfocusLostfocusEffectUsingEvent" Height="400" Width="450"
    >
  <StackPanel>
    <StackPanel.Resources>
      <Style TargetType="{x:Type Button}">
        <Setter Property="Height" Value="20"/>
        <Setter Property="Width" Value="250"/>
        <Setter Property="HorizontalAlignment" Value="Left"/>
      </Style>
    </StackPanel.Resources>
    <Button
        GotFocus="OnGotFocusHandler"
        LostFocus="OnLostFocusHandler">Click Or Tab To Give Keyboard Focus</Button>
    <Button
        GotFocus="OnGotFocusHandler"
        LostFocus="OnLostFocusHandler">Click Or Tab To Give Keyborad Focus</Button>
  </StackPanel>
</Window>

//File:Window.xaml.cs

using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Media;
using System.Windows.Input;

namespace WpfApplication1
{
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();
        }
        private void OnGotFocusHandler(object sender, RoutedEventArgs e)
        {
            Button tb = e.Source as Button;
            tb.Background = Brushes.Red;
        }
        private void OnLostFocusHandler(object sender, RoutedEventArgs e)
        {
            Button tb = e.Source as Button;
            tb.Background = Brushes.White;
        }
    }
}
WPF Fire An Event When An Element Gains And Loses Focus
24.165.Focus
24.165.1.Fire an event when an element gains and loses focus.Fire an event when an element gains and loses focus.
24.165.2.Focus a TextBox
24.165.3.Set Focus to TextBox
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