public ResultViewModel <InvoiceItemEditViewModel> Update(InvoiceItemEditViewModel emp)
        {
            ResultViewModel <InvoiceItemEditViewModel> result
                = new ResultViewModel <InvoiceItemEditViewModel>();

            try
            {
                if (!ModelState.IsValid)
                {
                    result.Message = "In Valid Model State";
                }
                else
                {
                    InvoiceItemEditViewModel selectedEmp
                        = InvoiceItemService.Update(emp);

                    result.Successed = true;
                    result.Data      = selectedEmp;
                }
            }
            catch (Exception ex)
            {
                result.Successed = false;
                result.Message   = "Semething Went Wrong";
            }
            return(result);
        }