Handler for the PreviewKeyDown event on the TextBox : TextBox « Windows Presentation Foundation « VB.Net Tutorial

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VB.Net Tutorial » Windows Presentation Foundation » TextBox   16.4.14.Handler for the PreviewKeyDown event on the TextBox <Window x:Class="WpfApplication1.Window1"   xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"   xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"   Title="Window1" Height="300" Width="300">   <Grid>     <StackPanel>       <TextBox x:Name="uv" PreviewKeyDown="TextBox_PreviewKeyDown" />     </StackPanel>   </Grid> </Window> //File:Window1.xaml.cs Imports System.Windows Imports System.Windows.Controls Imports System.Windows.Media Namespace WpfApplication1   Public Partial Class Window1     Inherits Window     Public Sub New()       InitializeComponent()       DataContext = Me     End Sub     '     Private Sub TextBox_PreviewKeyDown(sender As Object, e As RoutedEventArgs)       Dim textBox As TextBox = TryCast(sender, TextBox)       If textBox IsNot Nothing Then         textBox.Foreground = Brushes.Firebrick       End If     End Sub   End Class End Namespace 16.4.TextBox 16.4.1. You cannot use TextBox and Image at the same time for Button Content 16.4.2. Single line and Multiline TextBox 16.4.3. TextBox Column 16.4.4. Bind value to TextBox 16.4.5. An upside down TextBox 16.4.6. Style with Data Trigger for TextBox 16.4.7. TextBox with custom ErrorTemplate and ToolTip 16.4.8. TextBox uses the ExceptionValidationRule and UpdateSourceExceptionFilter handler 16.4.9. TextBox with UpdateSourceExceptionFilter handler 16.4.10. TextBox focus listener 16.4.11. TextBox MouseLeftButtonDown action and PreviewMouseLeftButtonDown action 16.4.12. Mark the text control as being changed to prevent any text content or selection changed events 16.4.13. Listen to TextBox text changed event 16.4.14. Handler for the PreviewKeyDown event on the TextBox 16.4.15. Format TextBox with MenuItem: normal, bold, italic 16.4.16. TextBox: set text, select all, clear, prepend, insert, append, cut, paste, undo 16.4.17. Set TextBox to editable 16.4.18. Scroll TextBox 16.4.19. Use TextBox.CommandBindingst to bind command 16.4.20. Use Dictionary to record which textbox has been changed and not saved 16.4.21. Set TextBox ContextMenu to null 16.4.22. TextBox Selection start, end and selected text 16.4.23. Scrollable TextBox Column 16.4.24. Check Spelling Error