Visual Basic 'NET BASICS

1
Visual Basic .NET BASICS

• Lesson 11
• List Boxes, For Next Loops, and Label Settings

2
Objectives

• Use the ListBox control to show multiple lines of
  information.
• Use For Next loops.
• Nest For Next loops.
• Change label font settings.

3
Using the ListBox Control

• Visual Basic .NET includes the ListBox control,
  which enables you to display a list of items to
  the user.
• Information is added to a ListBox using the
  Items.Add method.
• The items added to a ListBox object can be
  removed all at once by using the Items.Clear
  method.

4
Using For Next Loops

• The For Next loop is specifically designed for
  repeating a block of code a specific number of
  times.
• A For Next loop always begins with a For
  statement and ends with a Next statement.
• For Next loops always involve a Counter variable.

5
Using the Step Keyword

• The Step keyword is used to cause the loop
  counter to count by an increment other than one.
• Use a negative value after the Step keyword to
  count backwards.

6
Nesting For Next Loops

• For Next loops can be nested within other For
  Next loops or within Do loops.
• When you nest For Next loops, each nested loop
  must be completely contained within the outer
  loop.

7
Changing Label Font Settings

• When you create label controls on forms, you can
  control the font, style, and size using the Font
  property of the label control.
• You can make labels appear in any font installed
  on your computer.

8
Summary

• Visual Basic .NET includes a ListBox control for
  displaying lists of information. The Items.Add
  method adds items to a ListBox control. The
  Items.Clear method removes all the entries in a
  ListBox control.
• A For Next loop is specifically designed for
  repeating a block of code a specific number of
  times.

9
Summary (continued)

• A For Next loop always begins with a For
  statement and ends with a Next statement. The
  statements between the For and Next statements
  are repeated the number of times specified in the
  For Next loop.
• For Next loops always involve a Counter variable.

10
Summary (continued)

• If you want a For Next loop to count by an
  increment other than one, you can use the Step
  keyword. The Step keyword can also be used to
  make a For Next loop count backwards.
• For Next loops can be nested.

11
Summary (continued)

• Indenting your code can help make nested For Next
  loops easier to read. You can also use Next
  statements that specify the counter variable of
  the loop.
• You can use the Font property to change the font,
  style, and size of a label.