c# from to date gap validation code example

Example 1: compute months c#

public static int GetMonthDifference(DateTime startDate, DateTime endDate)
{
    int monthsApart = 12 * (startDate.Year - endDate.Year) + startDate.Month - endDate.Month;
    return Math.Abs(monthsApart);
}

Example 2: c# calculate difference between two dates in days

(EndDate - StartDate).TotalDays //double
(EndDate.Date - StartDate.Date).Days //int