private void populateRoomsOccupancy()
        {
            Stack <RoomOccupancyDTO> roomsOccupancy = DbAdapter.getPatientRoomsOccupancy(
                this.dateTimePickerCheckInDate.Value,
                this.dateTimePickerCheckOutDate.Value);

            this.roomsOccupancyTable = new DataTable();
            this.roomsOccupancyTable.Columns.Add(new DataColumn("Numer sali"));
            this.roomsOccupancyTable.Columns.Add(new DataColumn("Oddział"));
            this.roomsOccupancyTable.Columns.Add(new DataColumn("Budynek"));
            this.roomsOccupancyTable.Columns.Add(new DataColumn("Rezerwacja od"));
            this.roomsOccupancyTable.Columns.Add(new DataColumn("Rezerwacja do"));


            foreach (var roomOccupancy in roomsOccupancy)
            {
                this.roomsOccupancyTable.Rows.Add(
                    roomOccupancy.room_number,
                    roomOccupancy.department,
                    roomOccupancy.building,
                    roomOccupancy.date_from,
                    roomOccupancy.date_to
                    );
            }
        }