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Imagine we have an enum: enum Foo { A=1,B=2,C=3 } If the type is known at compile-time, a direct cast can be used to change between the enum-type and the underlying type (usually int ): static int GetValue() { return 2; } ... Foo foo = (Foo)GetValue(); // becomes Foo.B And boxing this gives a box of type Foo : object o1 = foo; Console.WriteLine(o1.GetType().Name); // writes Foo (and indeed, you can box as Foo and unbox as int , or box as int and unbox as Foo quite happily) However (the problem); if the enum type is only known at runtime things are... trickier. It is obviously trivial to box it as an int - but can I box it as Foo ? (Ideally without using generics and MakeGenericMethod , which would be ugly). Convert.ChangeType throws an exception. ToString and Enum.Parse works, but is horribly inefficient. I could look at the defined values ( Enum.GetValues or Type.GetFields ), but that is very hard for [Flags] , and even without would require getting back to the underlying-type first (which isn't as hard, thankfully). But; is there a more direct to get from a value of the correct underlying-type to a box of the enum-type, where the type is only known at runtime?

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