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Why is this an issue?
The requirement for a final Case Else clause is defensive programming.
This clause should either take appropriate action or contain a suitable comment as to why no action is taken.
Noncompliant code example
Select Case param ' Noncompliant - Case Else clause is missing
  Case 0
    DoSomething()
  Case 1
    DoSomethingElse()
End Select

Compliant solution
Select Case param
  Case 0
    DoSomething()
  Case 1
    DoSomethingElse()
  Case Else ' Compliant
    DoSomethingElse()
End Select

Resources

  
 CWE - CWE-478 - Missing Default Case in Switch Statement