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Masks
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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