Formatting number of days values in Months ,Days

DateTime StartDate = Convert.ToDateTime("01/1/2010");
DateTime EndDate = Convert.ToDateTime("02/15/2010");
string strResult = ConvertDaysToMonths(StartDate, EndDate);   

public string ConvertDaysToMonths(DateTime StartDate, DateTime EndDate)
        {
            DateTime oldDate;

            DateTime.TryParse(StartDate.ToShortDateString(), out oldDate);
            DateTime currentDate = EndDate;

            TimeSpan difference = currentDate.Subtract(oldDate);

            // This is to convert the timespan to datetime object
            DateTime DateTimeDifferene = DateTime.MinValue + difference;

            // Min value is 01/01/0001
            // subtract our addition or 1 on all components to get the actual date.
            int InYears = DateTimeDifferene.Year - 1;
            int InMonths = DateTimeDifferene.Month - 1;
            int InDays = DateTimeDifferene.Day - 1;

            return ((InYears * 12) + InMonths).ToString() + " Months " + InDays.ToString() + " Days";
        }