This is simple c# prime number program for beginners....

This is simple c# prime number program for beginners....


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

namespace primenumbersimple
{
    class Program
    {
        static void Main(string[] args)
        {
            int num1;

            Console.WriteLine("Accept number:");
            num1 = Convert.ToInt32(Console.ReadLine());
            if (isPrime(num1))
            {
                Console.WriteLine("It is prime");
            }
            else
            {
                Console.WriteLine("It is not prime");
            }
            Console.ReadKey();
        }

public static bool isPrime(int number)
{
    double boundary = Math.Floor(Math.Sqrt(number));

    if (number == 1) return false;
    if (number == 2) return true;

    for (int i = 2; i <= boundary; ++i)  {
        if (number % i == 0)  return false;
    }

    return true;       
}
      

        }
  
    }

Use this program and practice more an more dot net (c#)

Output: