24. Primes in Given Range

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Numerics;
using System.Globalization;
using System.Text.RegularExpressions;

namespace Praktice
{
    class Program
    {
        static void Main(string[] args)
        {
            int a = int.Parse(Console.ReadLine());
            int b = int.Parse(Console.ReadLine());
            List<int> primes = IsPrime(a, b);
            PrintPrimes(primes);
        }

        private static void PrintPrimes(List<int> primes)
        {
            Console.WriteLine(string.Join(", ",primes));
        }

        private static List<int> IsPrime(int a, int b)
        {
            List<int> result = new List<int>();          
            int count = 0;
            int d = Math.Max(a, 2);
            for (int i = d; i <= b; i++)
            {
                for (int c = 2; c < i; c++)
                {
                    if (i % c == 0)
                    {
                        count++;
                    }
                }
                if (count == 0) 
                {
                    result.Add(i);
                }
                count = 0;
            }
            return result;
        }
    }
}