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.vb
Imports System
Imports System.Collections.Generic
Imports System.Text
Imports System.Windows
Imports System.Windows.Controls
Imports System.Windows.Data
Imports System.Windows.Documents
Imports System.Windows.Input
Imports System.Windows.Media
Imports System.Windows.Media.Imaging
Imports System.Windows.Shapes

Namespace Commands
  Public Partial Class NoCommandTextBox
    Inherits System.Windows.Window
    Public Sub New()
      InitializeComponent()

      txt.InputBindings.Add(New KeyBinding(ApplicationCommands.NotACommand, Key.C, ModifierKeys.Control))
    End Sub

    Private Sub SuppressCommand(sender As Object, e As CanExecuteRoutedEventArgs)
      e.CanExecute = False
      e.Handled = True
    End Sub
  End Class
End Namespace

1.	Creating a KeyBinding between the Open command and Ctrl-R
2.	Command Handler Key Binding
3.	Use Keyboard.Focus to set the focus to a Text Field
4.	Provide Quick Keyboard Access to Buttons
5.	Reading keyboard modifiers
6.	Reading individual key state with Keyboard.IsKeyDown
7.	Use InputBinding to bind Application commends to Key events
8.	Suppress Keyboard and Mouse Events
9.	Query Left / Right control key
10.	Is Key.CapsLock Toggled
11.	Keyboard.IsKeyToggled
12.	Query Number lock key
13.	Custom Command by KeyGesture and RoutedUICommand
14.	TextBox PreviewKeyDown, PreviewKeyUp, PreviewTextInput, KeyDown, KeyUp and TextChanged events
15.	StackPanel PreviewTextInput and PreviewKeyDown
16.	If input is not a number do not handle the key event
17.	RoutedEvents: Tunneled Key Press
18.	On Key Down Handler

Use KeyBinding to bind Key event to TextBox.InputBindings : Key Event « Windows Presentation Foundation « VB.Net

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