Use KeyBinding to bind Key event to TextBox.InputBindings

  
<Window x:Class="Commands.NoCommandTextBox"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="NoCommandTextBox" Height="300" Width="300">
    <Grid>
      <TextBox Name="txt"/>
    </Grid>
</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 Commands
{
    public partial class NoCommandTextBox : System.Windows.Window
    {
        public NoCommandTextBox()
        {
            InitializeComponent();           
        
            txt.InputBindings.Add(new KeyBinding(ApplicationCommands.NotACommand, Key.C, ModifierKeys.Control));
        }
     
        private void SuppressCommand(object sender, CanExecuteRoutedEventArgs e)
        {
            e.CanExecute = false;
            e.Handled = true;
        }
    }
}

1.	Query Left / Right control key
2.	Query Left / Right Shift key
3.	Is Key.CapsLock Toggled
4.	Keyboard.IsKeyToggled
5.	Query Number lock key
6.	Use Keyboard.Focus to set the focus to a Text Field
7.	Programmatically Extract an Element's Style with DefaultStyleKeyProperty
8.	Provide Quick Keyboard Access to Buttons
9.	Reading keyboard modifiers
10.	Reading individual key state with Keyboard.IsKeyDown
11.	Suppress Keyboard and Mouse Events
12.	StackPanel PreviewTextInput and PreviewKeyDown
13.	If input is not a number do not handle the key event
14.	On Key Down Handler

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

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