// To protect from overposting attacks, enable the specific properties you want to bind to. // For more details, see https://aka.ms/RazorPagesCRUD. public async Task <IActionResult> OnPostAsync(int id) { if (!ModelState.IsValid) { return(Page()); } _context.Attach(Participant).State = EntityState.Modified; try { await _context.SaveChangesAsync(); } catch (DbUpdateConcurrencyException) { if (!ParticipantExists(Participant.ID)) { return(NotFound()); } else { throw; } } return(Redirect(Request.Headers["Referer"].ToString())); }