enum questions

[csharpula csharp]

Hello ,
I have 2 questions about enums:

1) How can I recognize defined enum in other projects ,do I have to add
the full namespace path before it such as:

Projects.New Project.Test.MessageType (MessageType is an enum) - each
time I use it or I can somehow do it with using in the head of the file?

2) How can I validate if I got a valid enum value? Is it possible this
way:

if (System.Enum.IsDefined(typeof(MessageType), msgType) == false)

Is it ok?
Thank u!
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