Visual Basic NET BASICS Lesson 11 List Boxes

Visual Basic. NET BASICS Lesson 11 List Boxes, For Next Loops, and Label Settings

Objectives n n Use the List. Box control to show multiple lines of information. Use For Next loops. Nest For Next loops. Change label font settings. 2

Using the List. Box Control n n n Visual Basic. NET includes the List. Box control, which enables you to display a list of items to the user. Information is added to a List. Box using the Items. Add method. The items added to a List. Box object can be removed all at once by using the Items. Clear method. 3

Using For Next Loops n n n 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. 4

Using the Step Keyword n n 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. 5

Nesting For Next Loops n n 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. 6

Changing Label Font Settings n n 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. 7

Summary n n Visual Basic. NET includes a List. Box control for displaying lists of information. The Items. Add method adds items to a List. Box control. The Items. Clear method removes all the entries in a List. Box control. A For Next loop is specifically designed for repeating a block of code a specific number of times. 8

Summary (continued) n n 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 loops always involve a Counter variable. 9

Summary (continued) n n 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. 10

Summary (continued) n n 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. 11