Microsoft Visual Basic 2010 Step by Step eBook

Chapter 12 Working with Collections 301

10. Click the Close button on the form.

The program ends.

Note The Text property changes made by the program have not been replicated on the

form within the Designer. Changes made at run time do not change the program’s core

property settings.

11. Click the Save All button on the Standard toolbar to save your changes. Specify the
    C:\Vb10sbs\Chap12 folder as the location.

Now you’re ready to try a different experiment with the Controls collection: using the Left

property to move each control in the Controls collection to the right.

Use a For Each... Next loop to move controls

1. Display the form again, and then double-click the second button
   object (Button2).


2. Type the following program code in the Button2_Click event procedure:

For Each ctrl In Controls

ctrl.Left = ctrl.Left + 25

Next

Each time the user clicks the second button, this For Each... Next loop steps

through the objects in the Controls collection one by one and moves them

25 pixels to the right. (To move objects 25 pixels to the left, you would subtract

25 instead .) A pixel is a device-independent measuring unit with which you can

precisely place objects on a form.

As in the previous event procedure that you typed, the ctrl variable is a

“stand-in” for the current object in the collection and contains the same

property settings as the object it represents. In this loop, you adjust the Left

property, which determines an object’s position relative to the left side of

the form.

3. Click the Start Debugging button.

The program runs, and three buttons appear on the left side of the form.