## Why is this an issue?

Nested `Select Case` structures are difficult to understand because you can easily confuse the cases of an inner `Select Case` as belonging to an outer statement. Therefore nested `Select Case` statements should be avoided.

Specifically, you should structure your code to avoid the need for nested `Select Case` statements, but if you cannot, then consider moving the inner `Select Case` to another function.

### Noncompliant code example

    Public Sub Foo(A As Integer, B As Integer)
        Select Case A
            Case 0
                ' ...
            Case 1
                Select Case B   ' Noncompliant; nested Select Case
                    Case 2
                        ' ...
                    Case 3
                        ' ...
                    Case 4
                        ' ...
                    Case Else
                        ' ...
                End Select
            Case 2
                ' ...
            Case Else
                ' ...
        End Select
    End Sub

### Compliant solution

    Public Sub Foo(A As Integer, B As Integer)
        Select Case A
            Case 0
                ' ...
            Case 1
                HandleB(B)
            Case 2
                ' ...
            Case Else
                ' ...
        End Select
    End Sub