private void FormService_Load(object sender, EventArgs e)
 {
     if (id.HasValue)
     {
         try
         {
             ServiceViewModel view = service.GetElement(id.Value);
             if (view != null)
             {
                 textBoxName.Text  = view.ServiceName;
                 textBoxPrice.Text = view.Price.ToString();
                 serviceDrugs      = view.ServiceDrugs;
                 LoadData();
             }
         }
         catch (Exception ex)
         {
             MessageBox.Show(ex.Message, "Ошибка", MessageBoxButtons.OK, MessageBoxIcon.Error);
         }
     }
     else
     {
         serviceDrugs = new List <ServiceDrugViewModel>();
     }
 }