C#: Adding working days from a cetain date

Question

I have trouble doing this. I\'m creating a method that add working days on a specific date. for example, I want to add 3 working days to sept 15, 2010 (Wednesday), the method wo

Answer 1

Is an old post but somebody could be interested in an extension that handles also negative days. (I've reworked @Jon answer)

    public static DateTime AddWeekDays(this DateTime start, int days)
    {
        int direction = Math.Sign(days);

        int completeWeeks = days / 5;
        int remaining = days % 5;

        DateTime end = start.AddDays(completeWeeks * 7);

        for (int i = 0; i < remaining * direction; i++)
        {
            end = end.AddDays(direction * 1);
            while (!IsWeekDay(end))
            {
                end = end.AddDays(direction * 1);
            }
        }
        return end;
    }

    private static bool IsWeekDay(DateTime date)
    {
        DayOfWeek day = date.DayOfWeek;
        return day != DayOfWeek.Saturday && day != DayOfWeek.Sunday;
    }