Question

In C#, do enum flags have to be sequential? or can you leave gaps? and still perform bit-wise comparisons? ie, can you do the following:

[Flags]
public enum MyEnum
{
    None = 0,
    IsStarred = 1,
    IsDone = 128
}

Answer 1

There is nothing wrong with the code you have posted. This is absolutely fine:

[Flags]
public enum MyEnum
{
    None = 0,
    IsStarred = 1,
    IsDone = 128
}

And so is this:

[Flags]
public enum MyEnum
{
    IsStarred = 1,
    IsDone = 128
    None = 0,
    SomethingElse = 4,
}

Just remember that the FlagsAttribute does not enforce your values to be bit masks.