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Software ==>	Visual C# (55 exercises)
Topic ==>	Looping (2 exercises)
Level ==>	Average difficulty
Subject ==>	C# training

Loop over a form's controls, checking the text boxes are filled in

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.

To avoid having to draw the form needed for this exercise, right-click on the name of your project in Solution Explorer then choose Add --> Existing Item... (you can also press SHIFT + ALT + A to do the same thing).

Choose only the file called frmApplication.cs in the above folder to import it into your project (you may need to overwrite existing files as you do this), then edit Program.cs to make this the default form. When you run your application, you should now see this:

The button should run code to check all text boxes and combo boxes are filled in.

The problem that you may have is that you can't just loop over all of the controls on a form, because the two group boxes shown will conceal the controls they contain. Because of this, you'll need the algorithm shown below.

Here's a suggested algorithm (shown in fairly sketchy pseudo-code):

// FOR EACH CONTROL ON THE FORM

// IF IT'S A GROUPBOX - IE IF (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 checked whether your validation code works OK, close down the application and the form.

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

You can find other training resources for the subject of this exercise here:

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C# EXERCISES

VISUAL C# EXERCISES

Loop over a form's controls, checking the text boxes are filled in

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