public class RandomGenerator
    {
        public static IEnumerable<int> Generate(int min, int max, int count)
        {
            long rangeLength = max - min + 1;
            if (rangeLength < count)
            {
                throw new Exception("You can't take more elements than range length");
            }
            if (count == 0)
            {
                yield break;
            }
            Random r = new Random();
            int interval = (int) (rangeLength / count);
            List<int> list = new List<int>(count);
            while (count > 0)
            {
                int elementsTakenFromInterval = Math.Max(r.Next(count), 1);
                if(elementsTakenFromInterval == 0)continue;
                count -= elementsTakenFromInterval;
                for (int i = 0; i < elementsTakenFromInterval; i++)
                {
                    int random = r.Next(min, Math.Max(min + (elementsTakenFromInterval / interval), min + 1));
                    min += Math.Max((elementsTakenFromInterval / interval), 1);
                    list.Add(random);
                }
            }
            foreach (var value in list.Shuffle())
            {
                yield return value;

            }
        }
    }