RoutedEvents: Key Modifiers

   
  
<Window x:Class="RoutedEvents.KeyModifiers"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="KeyModifiers" Height="300" Width="300">
  <StackPanel Margin="5">
    <TextBox KeyDown="KeyEvent"></TextBox>
    <TextBlock Name="lblInfo"></TextBlock>
    <Button Click="CheckShift">Check Current Shift State</Button>
  </StackPanel>
</Window>

//File:Window.xaml.cs

using System;
using System.Collections.Generic;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;

namespace RoutedEvents
{
    public partial class KeyModifiers : System.Windows.Window
    {
        public KeyModifiers()
        {
            InitializeComponent();
        }

        private void KeyEvent(object sender, KeyEventArgs e)
        {
            
            lblInfo.Text = "Modifiers: " + e.KeyboardDevice.Modifiers.ToString();

            if ((e.KeyboardDevice.Modifiers &amp; ModifierKeys.Control) == ModifierKeys.Control)
            {
                lblInfo.Text += "
You held the Control key.";                   
            }
        }

        private void CheckShift(object sender, RoutedEventArgs e)
        {
            if (Keyboard.IsKeyDown(Key.LeftShift))
            {
                lblInfo.Text = "The left Shift is held down.";                   
            }
            else
            {
                lblInfo.Text = "The left Shift is not held down.";                   
            }
            
        }
    }
}