Prime Number C# Program with keyboards input

Prime Number

using System;

namespace Prime_test

{

    class Program

    {

        static void Main(string[] args)

        {

            int num, i, ctr ,enno ,stno;

            Console.WriteLine("Enter the value of stno=");

            stno = Convert.ToInt32(Console.ReadLine());

            Console.WriteLine("Enter the valu of enno=");

            enno = Convert.ToInt32(Console.ReadLine());

            Console.WriteLine("The Prime bettewn {0} and {1}", enno, stno);

            for (num = stno; num <= enno; num++)

            {

                ctr = 0;

                for (i = 2; i <= num / 2; i++)

                {

                    if (num % 2 == 0)

                    {

                        ctr++;

                        break;

                    }

                }

                if (ctr == 0 && num != 1)

                    Console.WriteLine("The Prime number={0}", num);

            }

            Console.ReadKey();

        }

    }

}