In WPF, the Label control does not support text wrapping. If you need a label that wraps contents across multiple lines, you can use a TextBlock control. Place a TextBlock control inside a Label and apply wrapping on TextBlock.
example shows how to use a TextBlock to make a label that wraps several lines of text.
<Label Name="Label1" Width="200" HorizontalAlignment="Left"> <TextBlock TextWrapping="WrapWithOverflow"> This is a Label with text wrapping feature. If text does not fit in a single line, It will move to next line. </TextBlock></Label>