How do I use enum values from one class in another?

I have this class:
Code:
public class class1
    {
        [FlagsAttribute]
        public enum ContainterTypes : int
        {
            CT_OUTLOOK = 0,
            CT_XML = 1,
            CT_SDX = 2,
            CT_SAP = 4
        };
    }
and am simply trying to set a variable inside of another class to one of these enumerated values:
Code:
blahblah.SetContainerType(CT_XML);
which obvously doesn't work... I have tried
Code:
blahblah.SetContainerType(class1.ContainterTypes.CT_XML);
but no luck there either.

I have set a reference to the first class in the second.


what am I missing here?