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An enum can derive from any of the following types: byte, sbyte, short, ushort, int, uint, long, ulong. The default is int, and can be changed by specifying the type in the enum definition:

public enum Weekday : byte { Monday = 1, Tuesday = 2, Wednesday = 3, Thursday = 4, Friday = 5 }

This is useful when P/Invoking to native code, mapping to data sources, and similar circumstances. In general, the default int should be used, because most developers expect an enum to be an int.



An Enum (short for “enumerated type”) is a type consisting of a set of named constants, represented by a type-specific identifier.

Enums are most useful for representing concepts that have a (usually small) number of possible discrete values. For example, they can be used to represent a day of the week or a month of the year. They can be also be used as flags which can be combined or checked for, using bitwise operations.

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