If input is not a number do not handle the key event

    


<Window x:Class="RoutedEvents.OnlyNumbers"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Only Numbers" Height="300" Width="300">
    <StackPanel Margin="5" PreviewTextInput="pnl_PreviewTextInput" PreviewKeyDown="pnl_PreviewKeyDown">
        <TextBox Margin="3" AcceptsTab="False"></TextBox>
        <TextBox Margin="3"></TextBox>
        <TextBox Margin="3"></TextBox>
    </StackPanel>
    
</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 RoutedEvents
  Public Partial Class OnlyNumbers
    Inherits System.Windows.Window
    Public Sub New()
      InitializeComponent()
    End Sub
    Private Sub pnl_PreviewTextInput(sender As Object, e As TextCompositionEventArgs)
      Dim val As Short
      If Not Int16.TryParse(e.Text, val) Then
        e.Handled = True
      End If
    End Sub

    Private Sub pnl_PreviewKeyDown(sender As Object, e As KeyEventArgs)
      If e.Key = Key.Space Then
        e.Handled = True
      End If
    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.	Use KeyBinding to bind Key event to TextBox.InputBindings
14.	Custom Command by KeyGesture and RoutedUICommand
15.	TextBox PreviewKeyDown, PreviewKeyUp, PreviewTextInput, KeyDown, KeyUp and TextChanged events
16.	StackPanel PreviewTextInput and PreviewKeyDown
17.	RoutedEvents: Tunneled Key Press
18.	On Key Down Handler

If input is not a number do not handle the key event : Key Event « Windows Presentation Foundation « VB.Net

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