public JsonResult MakeInvoice([FromBody] Invoice _oInvoice)
        {
            try
            {
                FileResult fileResult;
                var        output = context.Invoices
                                    .Include(i => i.Order)
                                    .Include(i => i.ClientMaster)
                                    .Include(i => i.ClientMaster.StateMaster)
                                    .Include(i => i.ClientMaster.DistrictMaster)
                                    .Include(i => i.ClientMaster.CityMaster)
                                    .Include(i => i.ProductMaster)
                                    .Where(w => w.InvoiceID == _oInvoice.InvoiceID && w.IsDraft == false)
                                    .FirstOrDefault();

                if (output != null)
                {
                    output.InvoiceDetails = context.InvoiceDetails
                                            .Include(i => i.InventoryMaster)
                                            .Include(i => i.InventoryMaster.DeviceMaster)
                                            .Include(i => i.InventoryMaster.SpareMaster)
                                            .Include(i => i.InvoiceHeader)
                                            .Where(w => w.InvoiceID == _oInvoice.InvoiceID)
                                            .ToList();

                    if (output.InvoiceDetails != null)
                    {
                        var company = context.Companys.FirstOrDefault();

                        CommonLogic commonLogic = new CommonLogic();
                        string      body        = commonLogic.CreateInvoiceBody(_hostingEnvironment.WebRootPath, output, company);
                        fileResult = commonLogic.ConvertHtmlToPdf(body, output.InvoiceNumber);
                    }
                    else
                    {
                        fileResult = null;
                    }
                }
                else
                {
                    fileResult = null;
                }

                return(Json(fileResult));
            }
            catch (Exception ex)
            {
                throw;
            }
            finally
            {
                context = null;
            }
        }