Chapter 6 - Using Decision Structures - Part 1

So ... following the diagram on the previous page ... you could code an If-Then-Else as ...

~~~~~~~~~~~~~~~~~~~~~~~~~
If condition1 Then
  statement1
  statement2
End If
~~~~~~~~~~~~~~~~~~~~~~~~~

or

~~~~~~~~~~~~~~~~~~~~~~~~~
If condition3 Then
  statement4
ElseIf condition5 Then
  statement6
End If
~~~~~~~~~~~~~~~~~~~~~~~~~

... in addition to many other possibilities. The Intellisense feature in Visual Studio .NET helps a lot too by filling in part of the statements for you. These diagrams aren't as foolproof as the BNF (Backus-Naur Form) that was explained in the previous chapter. For example, the diagram would seem to suggest that ...

~~~~~~~~~~~~~~~~~~~~~~~~~
If condition
End If
~~~~~~~~~~~~~~~~~~~~~~~~~

... is a legal structure. But Visual Studio fills in Thenfor you automatically. Another point is that you are free to code completely meaningless statements, such as ...

~~~~~~~~~~~~~~~~~~~~~~~~~
If condition Then
End If
~~~~~~~~~~~~~~~~~~~~~~~~~

VB.NET will compile and run them just like statements that actually do something!

• A Decision Structure is the code that makes a program do different things
• Organization of the Lesson
• Beyond the Book: Modifying the Event Handler
• Responding to Events in Code
• Decision Structure Syntax - How to read Microsoft documentation
• Entering the If-Then-Else Code