enum (C# Reference)

 a distinct type consisting of a set of named constants called the enumerator list. Every enumeration type has an underlying type, which can be any integral type except char. The default underlying type of the enumeration elements is int.


enum Days {Sat, Sun, Mon, Tue, Wed, Thu, Fri};

enum Days {Sat=1, Sun, Mon, Tue, Wed, Thu, Fri};