1+2+3------+N Series summation C# Program Source Code

1+2+3------+N

using System;

namespace sumtion_serise

{

    class Program

    {

        static void Main(string[] args)

        {

            int i, sum = 0, n;

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

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

            for (i = 0; i <=n; i++)

            {

                sum =sum+i;

            }

            Console.WriteLine("the result of=={0}",sum);

            Console.ReadKey();

        }

    }

}