Print Prime Number in C sharp or Check given number is Prime Number or not in c sharp or Print Prime Number in C#

Step 1:- Method

        public void PrintPrimeNumber1()

        {

            int count, num, nd = 0;

            Console.WriteLine("Enter a positive integer...");

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

            if (num == 1)

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

            else

            {

                for (count = 1; count <= num; count++)

                {

                    if (num % count == 0)

                        nd++;

                }

                if (nd == 2)

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

                else

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

            }

        }

        public void PrintPrimeNumber2()

        {

            int count, num = 1, nd;

            Console.WriteLine("The prime number 1-100 are as follows");

            while (num <= 100)

            {

                nd = 0;

                for (count = 1; count <= num; count++)

                    if (num % count == 0)

                        nd++;

                if (nd == 2)

                    Console.WriteLine(num);

                num++;

            }

        }

Step 2:- Complete code

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace Console_Application_Demo

{

    class Program

    {

        public void PrintPrimeNumber1()

        {

            int count, num, nd = 0;

            Console.WriteLine("Enter a positive integer...");

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

            if (num == 1)

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

            else

            {

                for (count = 1; count <= num; count++)

                {

                    if (num % count == 0)

                        nd++;

                }

                if (nd == 2)

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

                else

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

            }

        }

        public void PrintPrimeNumber2()

        {

            int count, num = 1, nd;

            Console.WriteLine("The prime number 1-100 are as follows");

            while (num <= 100)

            {

                nd = 0;

                for (count = 1; count <= num; count++)

                    if (num % count == 0)

                        nd++;

                if (nd == 2)

                    Console.WriteLine(num);

                num++;

            }

        }

        static void Main(string[] args)

        {

            Program p = new Program();

            p.PrintPrimeNumber1();

            p.PrintPrimeNumber2();

            Console.ReadLine();

        }

    }

}

Example:-