In the XAML, we can use the 
 to wrap;
<TextBlock Height="219" HorizontalAlignment="Left" Margin="12,330,0,0" Name="textBlock1"
Text="TextBlock TextBlock" TextWrapping="NoWrap" VerticalAlignment="Top" Width="438" />
But i use the code like this:
this.textBlock1.Text = "TextBlock TextBlock";
It doesn’t wrap. I want to how to make it work in the .cs file.
but
"TextBlock TextBlock"is equal to"TextBlock\rTextBlock"