How to get next (or previous) enum value in C#

Question

I have an enum which is defined like this:

public enum eRat { A = 0, B=3, C=5, D=8 };

So given value eRat.B, I want to get the

Answer 1

I did something similar with a different enum. It's for a game and the player has the chance to toggle colors.

public enum PlayerColor {
    Red = 0, Green, Blue, Cyan, Yellow, Orange, Purple, Magenta
}

public PlayerColor GetNextFreeColor(PlayerColor oldColor) {

    PlayerColor newColor = (PlayerColor)((int)(oldColor + 1) % 8);
    return newColor;
}

This solution worked for me.