C# program to show entered number is prime or not

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace ConsoleApplication1

{

    class Program

    {

        static void Main(string[] args)

        {

            int num;

            int b = 2;

            Console.Write("Enter the Number: ");

            num = int.Parse(Console.ReadLine());

            while (b < num)

            {

                if (num % b == 0)

                {

                    Console.WriteLine("The number is not prime");

                    break;

                }

                b++;

            }

            if (b == num)

                Console.WriteLine("The number is prime");

            Console.ReadLine();

        }

    }

}