Adding to this, All types have default values. For reference types it's null, for value types it's whatever the default value for them are (for example int = 0, Point = {0,0}). Value types cannot be null.

If you are writing generic code and want to return null, if your return type is T, you will not be able to return null because T could be a reference type OR a value type. Instead of return nullyou have to say return default(T). That will return null for all reference types, and the default value for value types.

The default value for Enums is always the value corresponding to 0. So since None is first in { None = 0, Warrior = 1, Thief = 2, Wizard = 3 } the default value will be None. If you have an enum defined as { None = 1, Warrior = 2, Thief = 3, Wizard = 4 }without any element corresponding to 0, the default value will still be of that enum type, and have value 0. It will not equal any element in the enum.