How to: Set the Text Content of a TextBox Control
This example shows how to use the Text property to set the initial text contents of a TextBox control.
Note Although the Extensible Application Markup Language (XAML) version of the example could use the <TextBox.Text> tags around the text of each button's TextBox content, it is not necessary because the TextBox applies the ContentPropertyAttribute attribute to the Text property. For more information, see XAML Overview (WPF).
Example
<TextBox Name="tbSettingText">
Initial text contents of the TextBox.
</TextBox>
tbSettingText.Text = "Initial text contents of the TextBox."
tbSettingText.Text = "Initial text contents of the TextBox.";