Generate N random and unique numbers within a range

Question

What is an efficient way of generating N unique numbers within a given range using C#? For example, generate 6 unique numbers between 1 and 50. A lazy way would be to simply

Answer 1

For large sets of unique numbers, put them in an List..

        Random random = new Random();
        List uniqueInts = new List(10000);
        List ranInts = new List(500);
        for (int i = 1; i < 10000; i++) { uniqueInts.Add(i); }

        for (int i = 1; i < 500; i++)
        {
            int index = random.Next(uniqueInts.Count) + 1;
            ranInts.Add(uniqueInts[index]);
            uniqueInts.RemoveAt(index);
        }

Then randomly generate a number from 1 to myInts.Count. Store the myInt value and remove it from the List. No need to shuffle the list nor look to see if the value already exists.