How to check If a Enum contain a number?

Question

I have a Enum like this:

 public enum PromotionTypes
{
    Unspecified = 0, 
    InternalEvent = 1,
    ExternalEvent = 2,
    GeneralMailing = 3,  
    VisitBas         


        

Answer 1

You should use Enum.IsDefined.

I tried Enum.IsDefine but it only check the String value.

I'm 100% sure it will check both string value and int(the underlying) value, at least on my machine.