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The control also works well when bound to a data source.

If you cancel the Validating event, the behavior of the control will be determined by what value that you assigned to Auto Validate.If you need to require users to enter data in a well-defined format, such as a telephone number or a part number, you can accomplish this quickly and with minimal code by using the Masked Text Box control.A is a string made up of characters from a masking language that specifies which characters can be entered at any given position in the text box. If the user types an incorrect entry, for example, the user types a letter when a digit is required, the control will automatically reject the input.You can validate the data as the data is entered in a control by reading the keys as they are pressed, or more commonly whenever the user takes the input focus away from one control and moves to the next.This approach is useful when you want to give the user immediate feedback about the data as they are working.

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