using System;

/// <summary>

/// Inputs a number and output the sum of integers from 1 to that number.

/// </summary>

/// <example>

/// Please enter a number: 4

/// The sum is: 10

/// </example>

public class Program

{

    public static void Main()

    {

        Console.Write("Please enter a number: ");

        string imput = Console.ReadLine();

​

        int number = 0;

        try

        {

            number = int.Parse(imput);

        }

        catch (Exception ex) {}

​

        // string result;

        // int sum = 0;

        // for (int i = 1; i < number; i++) {

        //  sum += i;

        // }

        int sum = DoSomething(number);

​

        Console.WriteLine("The sum is: {1}", number, sum);

    }

​

    public static int DoSomething(int number) {

        string result;

        int sum = 0;

        for (int i = 1; i < number; i++) {

            Console.WriteLine("Debug: {0}", i);

            sum += i;

        }

        return sum;

    }

}