Microsoft Visual Basic 2005 BASICS

1
Microsoft Visual Basic 2005 BASICS

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

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Objectives

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

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Using the ListBox Control

• ListBox control
• Enables you to display a list of items to the
  user
• Add information to a ListBox
• Use the Items.Add method
• Remove all items added to a ListBox
• Use the Items.Clear method

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Using the ListBox Control (cont.)
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Using For Next Loops

• For Next loop
• Specifically designed for repeating a block of
  code a specific number of times
• Always begins with a For statement and ends with
  a Next statement
• Always involves a Counter variable

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Using For Next Loops (cont.)
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Using the Step Keyword to Count Forward

• Step keyword
• Used to cause the loop counter to count by an
  increment other than one

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Using the Step Keyword to Count Backward

• Use a negative value
• After the Step keyword to count backward

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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

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Nesting For Next Loops (cont.)
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Changing Label Font Settings

• 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.

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Changing Label Font Settings (cont.)
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Changing Label Font Settings (cont.)
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Summary

• Visual Basic 2005 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 entries in a
  ListBox control.
• A For Next loop is specifically designed for
  repeating a block of code a specific number of
  times.

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Summary (cont.)

• 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.

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Summary (cont.)

• If you want a For Next loop to count by an
  increment other than 1, you can use the Step
  keyword. The Step keyword can also be used to
  make a For Next loop count backward.
• For Next loops can be nested.

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Summary (cont.)

• 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.