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Microsoft Visual Basic 6.0 Desktop: Validation, Error Handling, and Help

Audience

Visual Basic 6.0 developers and web applications developers

Prerequisites

An understanding of the fundamentals of Visual Basic 6.0 development; thorough understanding of how to create and manage forms and controls

Course Aim

To show how to validate user input, handle errors, and add Help facilities to applications

Learning Objectives

Use the MaskedEdit control. Enable and disable controls in response to user input. Use the LostFocus, GotFocus, and Validate events to manage field validation. Explain the principles underlying error handling in Visual Basic. Create inline and centralized error handlers. Use the Resume statement in error handlers. Define and raise errors with the Err object. Include Help in applications.

Topics Covered

Input validation - Ensuring valid data entry - The MaskedEdit control - Using control events for validation - Form-level validation Error handling - Creating error handlers - Using the Err object - Inline and centralized error handling - Advanced error-handling issues Adding user Help - Setting properties for user Help - Help formats - Hands-on: Adding Help - Creating HTML Help files Hands-on: Validation and error handling - Live application tutorial - Validating data entry - Creating an error handler