public async void DeleteArea()
{
if (SelectedArea.Id == 0)
{
windowManager.ShowDialog(new ErrorViewModel(MyResources.SelectAreaMsg));
}
else
{
await managerService.DeleteSeatMapAsync(selectedArea.Id);
await managerService.DeleteAreaAsync(selectedArea.Id);
seatsByAreaId.Clear();
AreasByLayoutId = managerService.GetAllAreasByLayoutId(selectedLayout.Id);
}
}