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Field-Level Validation Techniques in Visual Basic 6

Field-level validation (as opposed to form-level validation) has to do with the verification of data entered into an individual field. Typically (but not always), field-level validation is performed without regard to the contents of other fields on the form. The appropriate times to perform field-level validation are:

  • As the user enters individual keystrokes into the field (Keystroke events as described in previous sections).

  • When the user attempts to leave the field—since we presume that the user considers the field entry to be complete (Validate event).

  • When the field changes for any reason (Change event).

Following topics are covered under this section:

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