C# Generate the Sum of N Numbers

using System;

namespace Program
{
    class Program
    {
        static void Main(string[] args)
        {
            int i, num, sum = 0;

            Console.Write("Enter the Nth number: ");
            num = Convert.ToInt16(Console.ReadLine());

            for (i = 0; i <= num; i++)
            {
                sum = sum + i;
            }

            Console.WriteLine("\nSum of N numbers: " + sum);

            Console.ReadLine();

        }
    }
}

 

Output