Microsoft Visual Basic 2010 Step by Step eBook

Chapter 7 Using Loops and Timers 187

2. Create a new Windows Forms Application project named My For Loop Icons.

Your new project starts, and a blank form opens in the Designer.

Note If you’re opening the project from the practice files I provided, you’ll see slightly

different code than what is shown in Step 7 of this exercise because we modify the For

Loop Icons project in the next exercise.

3. Click the PictureBox control in the Toolbox, and then draw a medium-sized square
   picture box object centered on the top half of the form.


4. Click the Button control, and then draw a very wide button below the picture box.
   (You’ll put a longer-than-usual label on the button .)


5. Set the following properties for the two objects:

Object Property Setting

PictureBox1 BorderStyle

SizeMode

Fixed3D

StretchImage

Button1 Text “Display Four Faces”

6. Double-click the Display Four Faces button on the form to display the event procedure
   for the button object.
   The Button1_Click event procedure appears in the Code Editor.


7. Type the following For... Next loop:

Dim i As Integer

For i = 1 To 4

PictureBox1.Image = System.Drawing.Image.FromFile _

("c:\vb10sbs\chap07\face0" & i & ".ico")

MsgBox("Click here for next face.")

Next

Tip The FromFile method in this event procedure is too long to fit on one line in this

book, so I broke it into two lines by using a space and the line continuation character (_).

You can use this character anywhere in your program code except within a string

expression. Starting in Visual Basic 2010, including the line continuation character (_) is

optional in most cases.

The loop uses the FromFile method to load four icon files from the C:\Vb10sbs\Chap07

folder on your hard disk. The file name is created by using the counter variable and the

concatenation operator you used earlier in this chapter. The code:

PictureBox1.Image = System.Drawing.Image.FromFile _

("c:\vb10sbs\chap07\face0" & i & ".ico")