private async void DeleteCustomer(int?obj)
        {
            try
            {
                dc = new DialogContent()
                {
                    Content = "Bạn muốn xóa customer này ?", Tilte = "Thông Báo"
                };
                var dialogYS = new DialogYesNo()
                {
                    DataContext = dc
                };
                var result = (bool)await DialogHost.Show(dialogYS, DialogHostId);

                if (result)
                {
                    if (obj != null)
                    {
                        if (await customer_repo.Remove((int)obj))
                        {
                            ListCustomer.Remove(ListCustomer.SingleOrDefault(t => t.CusID == (int)obj));
                            dc = new DialogContent()
                            {
                                Content = "Xóa Thành Công", Tilte = "Thông Báo"
                            };
                            dialog = new DialogOk()
                            {
                                DataContext = dc
                            };
                            await DialogHost.Show(dialog, DialogHostId);
                        }
                        else
                        {
                            dc = new DialogContent()
                            {
                                Content = "Xóa Thất Bại", Tilte = "Thông Báo"
                            };
                            dialog = new DialogOk()
                            {
                                DataContext = dc
                            };
                            await DialogHost.Show(dialog, DialogHostId);
                        }
                    }
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString());
            }
        }
        private async void ShowInfoCus(int?obj)
        {
            if (obj != null)
            {
                var index = (int)obj;

                var cus = ListCustomer.SingleOrDefault(t => t.CusID == index);
                if (cus != null)
                {
                    Name   = cus.Name;
                    CusID  = cus.CusID.ToString();
                    ImgCus = cus.Avatar.LoadImage();
                    Phone  = cus.Phone;
                    if (cus.Sex == true)
                    {
                        IsB = true;
                    }
                    if (cus.Sex == false)
                    {
                        IsG = true;
                    }
                    Address = cus.Address;
                    Email   = cus.Email;
                    if (cus.Kind != null)
                    {
                        int indexcus = (int)cus.Kind;
                        Kind = ListKinds.ElementAt(indexcus);
                    }
                    else
                    {
                        Kind = null;
                    }
                }

                await DialogHost.Show(new CustomerProfile(), DialogHostId);
            }
        }