MaskedTextBox.PromptChar Property


Gets or sets the character used to represent the absence of user input in MaskedTextBox.

Namespace:   System.Windows.Forms
Assembly:  System.Windows.Forms (in System.Windows.Forms.dll)

Public Property PromptChar As Char

Property Value

Type: System.Char

The character used to prompt the user for input. The default is an underscore (_).

Exception Condition

The character specified when setting this property is not a valid prompt character, as determined by the IsValidPasswordChar method of the MaskedTextProvider class.


The prompt character specified is the same as the current password character, PasswordChar. The two are required to be different.

PromptChar will be displayed in MaskedTextBox for any mask position that the user has not yet filled in.

Use the HidePromptOnLeave property to specify whether the prompt is displayed when MaskedTextBox does not have focus.

.NET Framework
Available since 2.0
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