Microsoft Visual Basic 2010 Step by Step eBook

Chapter 7 Using Loops and Timers 207

You’ve learned a handy skill that will allow you to insert a variety of useful code templates

into your own programs.

Tip To insert new snippets or reorganize the snippets you have, click the Code Snippets

Manager command on the Tools menu. The Code Snippets Manager dialog box gives you

complete control over the contents of the Insert Snippet list box and also contains a mechanism

for gathering new snippets online.

Chapter 7 Quick Reference

To Do This

Execute a group of

program statements

a specific number

of times

Insert the statements between For and Next statements in a loop. For

example:

Dim i As Integer

For i = 1 To 10

MsgBox("Press OK already!")

Next

Use a specific

sequence of numbers

with statements

Insert the statements in a For... Next loop, and use the To and Step

keywords to define the sequence of numbers. For example:

Dim i As Integer

For i = 2 To 8 Step 2

TextBox1.Text = TextBox1.Text & i

Next

Avoid an endless

Do loop

Be sure the loop has a test condition that can evaluate to False.

Declare a variable

and assign a value to

it at the same time

Use Dim to declare the variable, and then assign a value with the equal to

(=) operator. For example:

Dim Counter As Integer = 1

Exit a For... Next

loop prematurely

Use the Exit For statement. For example:

Dim InpName As String

Dim i As Integer

For i = 1 To 10

InpName = InputBox("Name?")

If InpName = "Trotsky" Then Exit For

TextBox1.Text = InpName

Next

Execute a group of

program statements

until a specific

condition is met

Insert the statements between the Do and Loop statements. For example:

Dim Query As String = ""

Do While Query <> "Yes"

Query = InputBox("Trotsky?")

If Query = "Yes" Then MsgBox("Hi")

Loop