public async Task <IActionResult> Edit(int id, [Bind("UserDataForeignKey,GroupForeignKey")] UserDataGroup userDataGroup)
        {
            if (id != userDataGroup.UserDataForeignKey)
            {
                return(NotFound());
            }

            if (ModelState.IsValid)
            {
                try
                {
                    _context.Update(userDataGroup);
                    await _context.SaveChangesAsync();
                }
                catch (DbUpdateConcurrencyException)
                {
                    if (!UserDataGroupExists(userDataGroup.UserDataForeignKey))
                    {
                        return(NotFound());
                    }
                    else
                    {
                        throw;
                    }
                }
                return(RedirectToAction(nameof(Index)));
            }
            ViewData["GroupForeignKey"]    = new SelectList(_context.groups, "GroupId", "GroupId", userDataGroup.GroupForeignKey);
            ViewData["UserDataForeignKey"] = new SelectList(_context.users, "UserDataId", "UserDataId", userDataGroup.UserDataForeignKey);
            return(View(userDataGroup));
        }
        public async Task <IActionResult> Create([Bind("UserDataForeignKey,GroupForeignKey")] UserDataGroup userDataGroup)
        {
            if (ModelState.IsValid)
            {
                _context.Add(userDataGroup);
                await _context.SaveChangesAsync();

                return(RedirectToAction(nameof(Index)));
            }
            ViewData["GroupForeignKey"]    = new SelectList(_context.groups, "GroupId", "GroupId", userDataGroup.GroupForeignKey);
            ViewData["UserDataForeignKey"] = new SelectList(_context.users, "UserDataId", "UserDataId", userDataGroup.UserDataForeignKey);
            return(View(userDataGroup));
        }