Introduction
I have used Visual Studio 2012 for debugging purpose. But you can use any version of visul studio as per your availability..
using System; using System.Collections.Generic; using System.Linq; using System.Text; public class csharpExercise { static void Main(string[] args) { int i, num, sum = 0; // Reading number Console.Write("Enter any number: "); num = Convert.ToInt32(Console.ReadLine()); for (i = 1; i <= num; i += 2) { //Adding current odd number to sum variable sum += i; } Console.WriteLine("Sum of all odd numbers between 1 to " + num + " = " + sum); Console.ReadLine(); } }