Switch Statements

Hi I have a program which uses a Switch statement.

Based on the case chosen I want a variable to be set to allow one of two options either "one" or "zero".

I have tired to use an OR statement within the case but it hasn't worked (See below).

Does anyone know a way around this? At the moment it is only allowing one value which is "one" but I want it to allow either "one" or "Zero".

Thanks in advance.

Switch (PLCData)

{

Case "01"

Message ="one";

AllowedValue ="one" || AllowedValue ="zero";

break;

Case "02"

}