Exercise: Validation the choices made on a dating agency form

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.

The answer to the exercise will be included and explained if you attend the Wise Owl courses listed below!

Category ==> Visual C Sharp 2010  (65 exercises)
Topic ==> Conditions  (2 exercises)
Level ==> Relatively easy
Courses ==> WinForms using Visual C#  /  Introduction to Visual C#
Before you can do this exercise, you'll need to download and unzip this file (if you have any problems doing this, click here for help).

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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 frmPreference.cs in the above folder to import it into your project, then edit Program.cs to make this the default form (you may need to overwrite any existing files with the same name).  When you run your application, you should now see this:

Dating agency form

You must choose options for the two combo boxes before continuing.


Attach code to the OK button so that you see one of the following two messages if you leave either of the combo boxes blank:

First field blank message Second field blank message
If the first one is blank ... If the second one is blank ...

To check if a combo box has a value, see if the length of its Text property is greater than 0. 

If both combo boxes are filled in, display a suitable confirmation message:

Confirmation message

Wise Owls can't afford to be fussy ...


Close down any forms that you've left open!

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