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Checking List Item Id
private IEnumerable<SearchItems> GetItems(ItemDescriptionFormViewModel viewModel = null)
{
    if(viewModel == null)
      viewModel = new AppointmentViewModel();
    IOrderedQueryable<ItemDescription> items= _itemDescriptionRepository.FindAll().OrderBy(
        c => c.Sort == null).ThenBy(
            c => c.Sort).ThenBy(c => c.Description);

    if(items.Count()==0)
        ModelState.AddModelError("", string.Format("No active {0} entered.", Kids.Resources.Entities.ItemDescription.EntityNamePlural));
   return
        _itemDescriptionRepository.FindAll().OrderBy(c => c.Description).Where(a=>a.IsActive == true || a.ItemDescriptionId == viewModel.ItemDescriptionId).Select(
            c => new SearchItems {Text = c.Description, Value = c.ItemDescriptionId.ToString()});
}

[HttpGet]
    [AppointmentAuthorization]
    public ActionResult Edit(Guid appointmentId)
    {
        Appointment appointment = _appointmentService.Get(appointmentId);
        if (appointment == null) return View("NotFound");


        var viewModel = new AppointmentViewModel
                            {
                                AppointmentId = appointment.AppointmentId,

                            };
        viewModel.Items= GetItems();

        return this.RazorView("Edit", viewModel);
    }

public IEnumberable<SearchItems> Items {get; set;}
public Guid ItemDescriptionid {get; set;}

[HttpGet]
    [AppointmentAuthorization]
    public ActionResult Create(Guid caseId)
    {
        var viewModel = new AppointmentViewModel
                            {
                               Items= GetItems()
                            };

        return this.RazorView("Create", viewModel);
    }

private IEnumerable<SearchItems> GetItems(Appointment appointment)
    {
        IEnumerable<short?> itemDescriptionIds =
            appointment.AppointmentItems.Where(c => c.ItemDescriptionId.HasValue).Select(
                c => c.ItemDescriptionId).Distinct();

        IOrderedQueryable<ItemDescription> itemDescription =
            _itemDescriptionRepository.FindAll().Where(
                a => a.IsActive == true || itemDescriptionIds.Contains(a.ItemDescriptionId)).OrderBy(
                    d => d.Description);

        return itemDescription.Select(c=> new SearchItems{Text = c.Description, Value = c.ItemDescriptionId.ToString()});
    }

var viewModel = new AppointmentViewModel
{
     AppointmentId = appointment.AppointmentId,
     ItemDescriptionId = appointment.ItemDescriptionId
};

private IEnumerable<SearchItems> GetItems(Guid lastId = new Guid())
{
    IOrderedQueryable<ItemDescription> items= _itemDescriptionRepository.FindAll();

    if(!items.Any())
        ModelState.AddModelError("", string.Format("No active {0} entered.", Kids.Resources.Entities.ItemDescription.EntityNamePlural));

    return items
        .OrderBy(c => c.Description).Where(a=>a.IsActive == true || a.ItemDescriptionId == lastId)
        .Select(c => new SearchItems {Text = c.Description, Value = c.ItemDescriptionId.ToString()});
}

viewModel.Items= GetItems(appointment.ItemDescriptionId);

var testExists = itemDescriptionRepository.FindAll().FirstOrDefault(a.ItemDescriptionId == lastId);