Input Library Overview / Masked Text Box / Work with MaskedTextBox / Watermark
Watermark

Using the Watermark property you can provide contextual clues of what value users should enter in a C1MaskedTextBox control. The watermark is displayed in the control while not text has been entered. To add a watermark, add the text Watermark="Watermark Text" to the <c1:C1MaskedTextBox> tag in the XAML markup for any C1MaskedTextBox control.

XAML
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<c1:C1MaskedTextBox Name="C1MaskedTextBox1" Watermark="Enter Text" Height="23" Margin="21,46,167,0" VerticalAlignment="Top" />

The control will appear similar to the following at run time:

If you click within the control and enter text, you will notice that the watermark disappears.