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MaxLength and Data-Bound Properties in Visual Basic 6

The following properties will save you the work of writing validation code since they will automatically enforce certain data-entry constraints on the user.

MaxLength

The TextBox control's MaxLength property allows you to specify the maximum number of characters that the user can enter into a TextBox. If the user tries to enter more than the maximum allowed, then the input is ignored.

If you set MaxLength's value to 0 (its default value), then there is no maximum length and the user can enter as many characters as desired (up to the 32K limit on the Text property's size).

Data-Bound Properties

These properties are only useful when the controls to which they belong are bound to data:

  • DataChanged is a property that allows the programmer to distinguish between changes made to a bound control's contents by the underlying data engine (caused by data navigation or updates from other users) versus changes made in the application by users or program code.

  • DataFormat allows the programmer to specify a mask for formatting data when it is retrieved from and stored to the underlying data structure.

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