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The MaskedTextBox supports a set of built-in masks.

The supported mask rules are:

  • 0—Requires a digit (0-9).
  • 9—Requires a digit (0-9) or a space.
  • #—Requires a digit (0-9), space, plus (+), or minus (-) sign.
  • L—Requires a letter (a-Z).
  • ?—Requires a letter (a-Z) or a space.
  • A—Requires an alphanumeric (0-9, a-Z).
  • a—Requires an alphanumeric (0-9, a-Z) or a space.
  • &—Requires a character (excluding space).
  • C—Requires a character or a space.

You can also define custom rules by using the rules property.

Apart from the built-in and custom rules, you can also use static symbols in the mask pattern that are also known as literals. In the masked value, a literal is always rendered on the same position as the position where it is defined in the mask property.

To escape a mask rule, use the slash (\) character. An escaped rule turns into a literal.

The following example demonstrates how to use the digit-requiring mask (0) and the literal (-) of the MaskedTextBox.

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The following example demonstrates how to extend the available mask rules.

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