Use KeyBinding to bind Key event to TextBox.InputBindings : Key Event « Windows Presentation Foundation « C# / CSharp Tutorial

<Window x:Class="Commands.NoCommandTextBox"
    Title="NoCommandTextBox" Height="300" Width="300">
      <TextBox Name="txt"/>
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 Commands
    public partial class NoCommandTextBox : System.Windows.Window
        public NoCommandTextBox()
            txt.InputBindings.Add(new KeyBinding(ApplicationCommands.NotACommand, Key.C, ModifierKeys.Control));
        private void SuppressCommand(object sender, CanExecuteRoutedEventArgs e)
            e.CanExecute = false;
            e.Handled = true;
WPF Use Key Binding To Bind Key Event To Text Box Input Bindings

24.122.Key Event
24.122.1.Query Left / Right control keyQuery Left / Right control key
24.122.2.Query Left / Right Shift keyQuery Left / Right Shift key
24.122.3.Is Key.CapsLock ToggledIs Key.CapsLock Toggled
24.122.5.Query Number lock keyQuery Number lock key
24.122.6.Use Keyboard.Focus to set the focus to a Text FieldUse Keyboard.Focus to set the focus to a Text Field
24.122.7.Programmatically Extract an Element's Style with DefaultStyleKeyPropertyProgrammatically Extract an Element's Style with DefaultStyleKeyProperty
24.122.8.Provide Quick Keyboard Access to ButtonsProvide Quick Keyboard Access to Buttons
24.122.9.Reading keyboard modifiersReading keyboard modifiers
24.122.10.Reading individual key state with Keyboard.IsKeyDownReading individual key state with Keyboard.IsKeyDown
24.122.11.Suppress Keyboard and Mouse EventsSuppress Keyboard and Mouse Events
24.122.12.Use KeyBinding to bind Key event to TextBox.InputBindingsUse KeyBinding to bind Key event to TextBox.InputBindings
24.122.13.StackPanel PreviewTextInput and PreviewKeyDownStackPanel PreviewTextInput and PreviewKeyDown
24.122.14.If input is not a number do not handle the key eventIf input is not a number do not handle the key event
24.122.15.On Key Down HandlerOn Key Down Handler
24.122.16.Check if it is a key down action
24.122.17.Check if it is a key up action
24.122.18.Record Key strokes
24.122.19.Override OnTextInput method to get the input from key board
24.122.20.TextBox key pressed action listener, and set caret index for TextBox
24.122.21.override key down method to listen to key down event
24.122.22.Check key code for Key.Up and Key.Down