This code is to add and remove a value from a flagged enum-instance:
[Flags]
public enum MyEnum
{
Flag1 = 1 << 0,
Flag2 = 1 << 1,
Flag3 = 1 << 2
}
var value = MyEnum.Flag1;
// set additional value
value |= MyEnum.Flag2; //value is now Flag1, Flag2
value |= MyEnum.Flag3; //value is now Flag1, Flag2, Flag3
// remove flag
value &= ~MyEnum.Flag2; //value is now Flag1, Flag3