Select Case statements can lead to errors when the test expression in the Select Case line doesn’t yield a true result for any of its individual Case expressions. Therefore, you should always use a Case Else as the final Case within a Select Case statement. This sample raises a custom error when an application invokes the Select Case statement with an operation other than the four basic ones:
Select Case Operation Case "Addition" Computer2 = dblNumber1 + _ dblNumber2 Case "Subtraction" Computer2 = dblNumber1 - _ dblNumber2 Case "Multiplication" Computer2 = dblNumber1 * _ dblNumber2 Case "Division" Computer2 = dblNumber1 / _ dblNumber2 Case Else Err.Raise 1, , "Wrong operation."End Select
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