private void fillGriddDailyMarking() { if (DPDate.SelectedDate != null) { DateTime selecteddate = (DateTime)DPDate.SelectedDate; ObservableCollection <DailyMarking> dailyMarkingList = new ObservableCollection <DailyMarking>(markingControl.getDailyMarkings((Company)CBCompany.SelectedItem, (Department)CBDepartment.SelectedItem, (Office)CBOffice.SelectedItem, (Employee)CBEmployee.SelectedItem, (Schedule)CBSchedule.SelectedItem, selecteddate)); GDScheduleDays.ItemsSource = dailyMarkingList; } }