<Window x:Class="WpfApplication1.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="WPF" Height="300" Width="300"> <StackPanel> <TextBox AcceptsReturn="True" Height="100" IsReadOnly="True" Name="textBox1" TextAlignment="Left" TextWrapping="Wrap" VerticalScrollBarVisibility="Auto"> Default starting text. </TextBox> <WrapPanel Margin="10"> <Button Margin="5" Name="textButton" Width="75" Click="TextButton_Click">Set Text</Button> <Button Margin="5" Name="selectAllButton" Width="75" Click="SelectAllButton_Click">Select All</Button> <Button Margin="5" Name="clearButton" Width="75" Click="ClearButton_Click">Clear</Button> <Button Margin="5" Name="prependButton" Width="75" Click="PrependButton_Click">Prepend</Button> <Button Margin="5" Name="insertButton" Width="75" Click="InsertButton_Click">Insert</Button> <Button Margin="5" Name="appendButton" Width="75" Click="AppendButton_Click">Append</Button> <Button Margin="5" Name="cutButton" Width="75" Click="CutButton_Click">Cut</Button> <Button Margin="5" Name="pasteButton" Width="75" Click="PasteButton_Click">Paste</Button> <Button Margin="5" Name="undoButton" Width="75" Click="UndoButton_Click">Undo</Button> </WrapPanel> </StackPanel> </Window> //File:Window.xaml.cs using System.Windows; using System.Windows.Controls; namespace WpfApplication1 { public partial class Window1 : Window { public Window1() { InitializeComponent(); } private void AppendButton_Click(object sender, RoutedEventArgs e) { textBox1.AppendText("text"); } private void ClearButton_Click(object sender, RoutedEventArgs e) { textBox1.Clear(); } private void CutButton_Click(object sender, RoutedEventArgs e) { if (textBox1.SelectionLength == 0) { MessageBox.Show("Select text to cut first.", Title); } else { MessageBox.Show("Cut: " + textBox1.SelectedText, Title); textBox1.Cut(); } } private void InsertButton_Click(object sender, RoutedEventArgs e) { textBox1.Text = textBox1.Text.Insert(textBox1.CaretIndex, "text"); } private void PasteButton_Click(object sender, RoutedEventArgs e) { textBox1.Paste(); } private void PrependButton_Click(object sender, RoutedEventArgs e) { textBox1.Text = textBox1.Text.Insert(0, "Prepend"); } private void SelectAllButton_Click(object sender, RoutedEventArgs e) { textBox1.SelectAll(); textBox1.Focus(); } private void TextButton_Click(object sender, RoutedEventArgs e) { textBox1.Text = "new value"; } private void UndoButton_Click(object sender, RoutedEventArgs e) { textBox1.Undo(); } } }