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

 int val=382

 int mask = ~(1 << N)   

 // this would turn-off nth bit (0 to 31)
 NewVal = (int) ((uint)val & (uint)mask}