C# prime generator

Prime.cs

class Prime
    {
        static bool IsPrime(int num)
        {
            int to = (int)Math.Round(Math.Sqrt(num));
            return !Enumerable.Range(2, to).Any(i => num % i == 0);
        }
        public static IEnumerable<int> GetPrimes(int count)
        {
            int current = 2;
            int counter = 0;
            while (counter < count)
            {
                if (IsPrime(current))
                {
                    counter++;
                    yield return current;
                }

                current++;
            }
        }
    }