How do you randomly zero a bit in an integer?

Question

Updated with newer answer and better test

Let\'s say I have the number 382 which is 101111110.

How could I randomly turn a bit which is not 0 to

Answer 1

OK:

    private static Random rnd = new Random((int)DateTime.Now.Ticks);

    private static Int32 SetRandomTrueBitToFalse(Int32 p)
    {
        List trueBits = new List();
        for (int i = 0; i < 31; i++)
        {
            if ((p>>i&1) == 1){
                trueBits.Add(i);
            }
        }
        if (trueBits.Count>0){
            int index = rnd.Next(0, trueBits.Count);
            return p & ~(1 << trueBits[index]);
        }
        return p;
    }

But I would love to know: Why do you need/want this?