how to avoid number repeation by using random class in c#?

Question

hi i am using Random class for getting random numbers but my requirement is once it generate one no that should not be repeate again pls help me.

Answer 1

Keep a list of the generated numbers and check this list before returning the next random.

Since you have not specified a language, I'll use C#

List<int> generated = new List<int>;
public int Next()
{
   int r;
   do {  r = Random.Next() } while generated.Contains(r);
   generated.Add(r);
   return r;
}