GetName for enum with duplicate values

Question

If I have duplicate values in a C# enum, saying

enum MyE {
  value1 = 1,
  value2 = 2,
  valued = 1
}

What should be the values of the foll

Answer 1

From the "Remarks" section on the Enum.GetName method documentation (http://msdn.microsoft.com/en-us/library/system.enum.getname.aspx), it says:

If multiple enumeration members have the same underlying value, the GetName method guarantees that it will return the name of one of those enumeration members. However, it does not guarantee that it will always return the name of the same enumeration member. As a result, when multiple enumeration members have the same value, your application code should never depend on the method returning a particular member's name.

I ran a test to see what would happen experimentally, and it always returned the first value defined (in your example, value1), but according to the official documentation above, you cannot rely on that (see comment by @gluk47, indicating different behavior in the wild).