Test that only a single bit is set in Flags Enum [duplicate]

Answer 1

To check that only a single bit is set in a number, the number must (by definition) be a power of two. As such, you can use the following to test:

int intVal = ((int)myEnumFlags);
bool singleBitIsSet = intVal != 0 && (intVal & (intVal-1)) == 0;

My favorite reference for this kind of thing:

http://aggregate.org/MAGIC