public AdminManagement()
{
InitializeComponent();
List <Room> rooms = roomViewModel.FindAll();
List <Employee> employees = employeeViewModel.FindAll();
RoomsGrid.ItemsSource = rooms;
RoomTypeCb.ItemsSource = typeRoomViewModel.FindAllActive();
EmployeesGrid.ItemsSource = employees;
RoleTypeCb.ItemsSource = roleViewModel.FindAll();
CustomersGrid.ItemsSource = customerViewModel.FindAll();
TypeRoomsGrid.ItemsSource = typeRoomViewModel.FindAllActive();
}