This is actually an answer to an old post which is closed. But it may nevertheless be useful to someone.

Old Post: Has if () syntax of C# no IN operator like Pascal or SQL (IN, LIKE,BETWEEN)?

Good, short and fast possibility is to define the enum as flags, like e.g.:

Code:
[Flags]
internal enum TokenType
{
	Empty = 0,
	LBrace = 1,
	PlusLBrace = 2,
	RBrace = 4,
...