private void set_hours()
{
List<string> hours = new List<string>();
DateTime DT = Test_datePicker.SelectedDate.Value;
DT = DT.AddHours(9);
for (int i = 9; i < 15; i++)
{
var v = myBL.Available_testers_nearby(DT, trainee.Address, trainee.Car_type, trainee.Gear_type);
if (v.Count() != 0)
hours.Add(i + ":00");
DT = DT.AddHours(1);
}
Test_hourComboBox.ItemsSource = hours;
}