How to write a program to print prime number in c#

Write a program to accept a number from the user and display all the prime numbers from one up to the number entered by user.

Sample Solution

C# Sharp Code

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace primeNum
{
    class Program
    {
        int num = 0;
        public int number;
        public void Prim()
        {
            Console.WriteLine("Enter a Number for Prime number");
            number = Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("Prime number Are ");

            for (int i = 2; i <= number; i++)
            {
                for (int j = 1; j <= i; j++)
                {
                    if (i % j == 0)
                    {
                        num++;
                    }
                }
                if (num == 2)
                    Console.WriteLine(i);
                num = 0;
            }
        }
      static void Main(string[] args)
        {
            Program obj = new Program();


            obj.Prim();
            Console.ReadLine();
        }
    }
}

    

If you want to display 1 to 20 Prime numbers, then just enter 20 after that you can get the result.
Show the below output.

                                                            Sample Output

If you want to display 1 to 100 Prime numbers, then just enter 100 after that you can get the result.
Show the below output.

                                                            Sample Output