Calculate difference between two dates (number of days)?

using System.Globalization;

public int DayDifference(string strFromDt, string strToDate)

        {

            DateTime fromDate = Convert.ToDateTime(DateTime.ParseExact(strFromDt, "dd/MM/yyyy", CultureInfo.InvariantCulture).ToString("MM/dd/yyyy", CultureInfo.InvariantCulture));

            DateTime toDate = Convert.ToDateTime(DateTime.ParseExact(strToDate, "dd/MM/yyyy", CultureInfo.InvariantCulture).ToString("MM/dd/yyyy", CultureInfo.InvariantCulture));

            TimeSpan span = toDate.Subtract(fromDate);

            int day = span.Days;

            return day;

        }

Note:-

Date format to pass “dd/MM/yyyy”