Get Date Difference in months from C#.NET

/// Returns the number of months between startDate and endDate.

/// If the startDate is greater than endDate the result is negative.
///

/// Start Date

/// End Date

///

        public int MonthDifference(DateTime startDate, DateTime endDate)

        {

            #region Analysis

            // This came from the following analysis

            // Assume 1 is start date and 2 is end date

            // if Y2 = Y1 then M2 - M1

            // else (12 - M1) + [(Y2 - Y1 - 1) * 12] + M2

            #endregion

            return endDate.Month - startDate.Month + ((endDate.Year - startDate.Year) * 12);

        }