public async Task <IActionResult> Edit(int id, [Bind("Id", "Participant1Id", "Participant2Id", "Timestamp")] ConversationViewModel viewModel)
        {
            if (id != viewModel.Id)
            {
                return(NotFound());
            }

            if (ModelState.IsValid)
            {
                try
                {
                    var conversation = viewModel.ToConversation(_context);
                    _context.Update(conversation);
                    await _context.SaveChangesAsync();
                }
                catch (DbUpdateConcurrencyException)
                {
                    if (!ConversationExists(viewModel.Id))
                    {
                        return(NotFound());
                    }
                    else
                    {
                        throw;
                    }
                }
                return(RedirectToAction(nameof(Index)));
            }
            return(View(viewModel));
        }
        public async Task <IActionResult> Edit(int id, [Bind("Id,Name,Tag,IsPresent")] Participant participant)
        {
            if (id != participant.Id)
            {
                return(NotFound());
            }

            if (ModelState.IsValid)
            {
                try
                {
                    _context.Update(participant);
                    await _context.SaveChangesAsync();
                }
                catch (DbUpdateConcurrencyException)
                {
                    if (!ParticipantExists(participant.Id))
                    {
                        return(NotFound());
                    }
                    else
                    {
                        throw;
                    }
                }
                return(RedirectToAction(nameof(Index)));
            }
            return(View(participant));
        }