Get Nth Business Day C#

DateUtil.cs

using System;

namespace TestApp
{
    public class DateUtil
    {
        public static DateTime Get5thBusinessDay(DateTime sourceMonth)
        {
            return GetNthBusinessDay(5, sourceMonth);
        }

        public static DateTime GetNthBusinessDay(int nth, DateTime sourceDate, bool isSaturdayBusinessDay = false)
        {
            if (nth <= 0)
                throw new Exception("Invalid 'nth' input");

            var date = new DateTime(sourceDate.Year, sourceDate.Month, 1);

            int businessDays = 0;

            while (true)
            {
                if (IsHoliday(date)
                    || (date.DayOfWeek == DayOfWeek.Saturday && !isSaturdayBusinessDay)
                    || (date.DayOfWeek == DayOfWeek.Sunday))
                {
                    date = date.AddDays(1);
                    continue;
                }

                if (++businessDays == nth)
                    return date;

                date = date.AddDays(1);
            }
        }

        public static bool IsHoliday(DateTime date)
        {
            //TODO Check JSON Holidays
            return false;
        }
    }
}