Visual Basic.NET How to Program (PDF)

158 Control Structures: Part 2 Chapter 5
Common Programming Error 5.5
When using the optional Case Else statement in a Select Case structure, failure to
place the Case Else as the last Case is a syntax error. 5.5
Testing and Debugging Tip 5.3
Provide a Case Else in Select Case structures. Cases not handled in a Select Case
structure are ignored unless a Case Else is provided. The inclusion of a Case Else statement
facilitates the processing of exceptional conditions. In some situations, no Case Else
processing is needed. 5.3
Case statements also can use relational operators to determine whether the controlling
expression satisfies a condition. For example
Case Is < 0
uses keyword Is along with the relational operator,