public async Task <IActionResult> OnGetAsync(int?id)
        {
            if (id == null)
            {
                return(NotFound());
            }

            Order = await _context.Order
                    .Include(o => o.Product)
                    .Include(o => o.Signup).FirstOrDefaultAsync(m => m.Id == id);

            if (Order == null)
            {
                return(NotFound());
            }
            ViewData["ProductId"] = new SelectList(_context.Set <Product>(), "Id", "Product_Name");
            ViewData["SignupId"]  = new SelectList(_context.Set <Signup>(), "Id", "Signup_Email");
            return(Page());
        }
 public IActionResult OnGet()
 {
     ViewData["ProductId"] = new SelectList(_context.Set <Product>(), "Id", "Product_Name");
     ViewData["SignupId"]  = new SelectList(_context.Set <Signup>(), "Id", "Signup_Email");
     return(Page());
 }