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Software ==>	Visual Basic (46 exercises)
Topic ==>	Loops (2 exercises)
Level ==>	Average difficulty
Subject ==>	Visual Basic training

Validate the controls on a form by looping over them within groupboxes

This exercise is provided to allow potential course delegates to choose the correct Wise Owl Microsoft training course, and may not be reproduced in whole or in part in any format without the prior written consent of Wise Owl.

Before you can do this exercise, you'll need to download and unzip this file .

Press CTRL + D to add the file called frmApplication.vb from the above folder into your project (or right click on the project and choose to add it as an existing item).

Change your project's properties to make this the default form for your project. When you run your project, you should see this:

Application form for dating agency

For the exercise you'll add code to this button to validate all of the input boxes.

Sadly you can't just loop over all of the controls on the form, because some of them are hidden in the two group boxes. Because of this you need a different algorithm - a suggestion is shown below.

Here's a suggestion for how to solve our problem:

'FOR EACH CONTROL ON THE FORM

'IF IT'S A GROUPBOX (that is, if TYPEOF G IS GROUPBOX)

'FOR EACH CONTROL IN THE COLLECTION OF CONTROLS

'WITHIN THIS GROUPBOX g

'CHECK THIS CONTROL ISN'T A LABEL (NOT INTERESTED

'IN THESE)

'IF THE LENGTH OF THIS CONTROL IS 0, SET THE

'FOCUS TO THIS CONTROL AND REPORT ERROR

When you've written your code (!), check it works, then close down your application and form.

You can unzip this file to see the answers to this exercise, although please remember this is for your personal use only.

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