Bool Temporary Variable in Enum c#

Hi there! Iv came across a small issue with one of my scripts. I have made a random level manipulator however I wish to make it more random. I know the logic behind this: make the last chosen equal to the temp variable and if the new one is that then pick another. However my random selector uses a enum array and everything in side it are Booleans... Here is my code: variables : enum Manipss { upsideDown = 1 , screenShrink = 2 , bottomRising = 3 , topFalling = 0 } Manipss randomManip;

Selecting new manip every 15 sec: InvokeRepeating("ManipCountdown", 0.0f, 15.0f);

selecting random manip: randomManip = (Manipss)Random.Range(0, 4);

Thanks for any help and ideas to the issue! :)