using static System.Console;
DateTime firstDate = new(2022, 7, 6);
DateTime lastDate = new(2022, 7, 15);
var totalHoliday = (lastDate - firstDate).TotalDays + 1;
for (var i = 0; i < totalHoliday; i++)
firstDate.DayOfWeek == DayOfWeek.Saturday :
firstDate.AddDays(i).DayOfWeek == DayOfWeek.Saturday)
if (lastDate.DayOfWeek == DayOfWeek.Friday)
WriteLine($"Total holiday: {totalHoliday}");
WriteLine($"Total saturday in holiday: {totalSaturday}");