int? quantity = 0;
var ticketParam = new SqlParameter("Ticket", ticket);
var referenceParam = new SqlParameter("Reference", reference);
var quantityParam = new SqlParameter("Quantity") { Direction = ParameterDirection.Output };
try
{
    await _context.Database.ExecuteSqlRawAsync("EXEC Production.Select_TicketQuantity @Ticket, @Reference, @Quantity output", new[] { ticketParam, referenceParam, quantityParam });
    quantity = Convert.ToInt32(quantityParam.Value);
}
catch (Exception ex)
{
    _logger.LogError($"{ex}");
    return RedirectToPage("Index");
}