public async Task <IActionResult> OnPostAsync() { if (!ModelState.IsValid) { return(Page()); } _context.Attach(Event).State = EntityState.Modified; try { await _context.SaveChangesAsync(); } catch (DbUpdateConcurrencyException) { if (!EventExists(Event.Id)) { return(NotFound()); } else { throw; } } return(RedirectToPage("./OrganizeEvents")); }