Listen to TextBox text changed event

    

<Window x:Class="WpfApplication1.Window1"
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  Title=" " Height="300" Width="300" Loaded="Window1_Loaded">
  <Grid>
    <Viewbox>
      <TextBox x:Name="tbxEditMe" Text="Edit Me..." />
    </Viewbox>      
  </Grid>
</Window>


//File:Window.xaml.vb
Imports System
Imports System.ComponentModel
Imports System.Windows
Imports System.Windows.Controls

Namespace WpfApplication1
  Public Partial Class Window1
    Inherits Window
    Public Sub New()
      InitializeComponent()
    End Sub

    Private Sub Window1_Loaded(sender As Object, e As RoutedEventArgs)
      Dim descriptor As DependencyPropertyDescriptor = DependencyPropertyDescriptor.FromProperty(TextBox.TextProperty, GetType(TextBox))
      descriptor.AddValueChanged(tbxEditMe, AddressOf tbxEditMe_TextChanged)

    End Sub

    Private Sub tbxEditMe_TextChanged(sender As Object, e As EventArgs)
      MessageBox.Show("", "changed")
    End Sub
  End Class
End Namespace

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Listen to TextBox text changed event : TextBox « Windows Presentation Foundation « VB.Net

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