ComponentOne Basic Library for UWP
Basic Library Overview / Input for UWP / Working with Input for UWP / Working with C1MaskTextBox / Mask Formatting / Prompts
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    Prompts
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    You can choose to include prompt characters in the C1MaskedTextBox control. The prompt character defined that text that will appear in the control to prompt the user to enter text. The prompt character indicates to the user that text can be entered, and can be used to detail the type of text allowed. By default the underline "_" character is used. 

    Note that the C1MaskedTextBox.TextMaskFormat property must be set to IncludePrompt or IncludePromptAndLiterals for prompt characters to be used. If you do not want prompt characters to be used, set C1MaskedTextBox.TextMaskFormat to IncludeLiterals or ExcludePromptAndLiterals.

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