[C#] 특정기간 동안 월단위로 무언가 처리 할때

using System;                   

public class Program
{
    public static void Main()
    {
        Boolean isFinished = false;
        string dealYear = "2017";
        string dealMonth = "6";     

        DateTime procDateTime = new DateTime(Convert.ToInt32(dealYear), Convert.ToInt32(dealMonth), 1);     

        TimeSpan timeSpan;      

        while(!isFinished)
        {
            timeSpan = DateTime.Now.AddDays(1-DateTime.Now.Date.Day) - procDateTime;        

            if (timeSpan.Days <= 0)
            {
                isFinished = true;

            } 
            else 
            {
                procDateTime = procDateTime.AddMonths(1);                       

                isFinished = false; 
                
                Console.WriteLine("뭔가 한다! | " + procDateTime.ToString() + " | " + timeSpan.Days.ToString());                
            }
        }       

    }

}

과거 특정 월부터 현재월까지 무언가 처리해야할때 !

.NET Fiddle Sample Link