Find The sum of N numbers

 

 

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

namespace ConsoleApplication3
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Enter N number");
            int n = Convert.ToInt32(Console.ReadLine());
            int i = 0, sum=0;
            for (i = 0; i <= n; i++)
            {
                sum = sum + i;
            }
            Console.WriteLine(sum);
            Console.ReadLine();

        }
    }
}