public async Task <IActionResult> OnGetAsync(int?id)
{
if (id == null)
{
return(NotFound());
}
Invoice = await _invoiceService.GetInvoiceById(id);
if (Invoice == null)
{
return(NotFound());
}
InvoiceDetails = await _invoiceDetailService.GetAllInvoiceDetails(Invoice.Id);
return(Page());
}