ASP.NET_Core_SPAs.API.ContactsApiController.PutContact C# (CSharp) Method

        public async Task<IActionResult> PutContact([FromRoute] int id, [FromBody] Contact contact)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

            if (id != contact.Id ||
                _userManager.GetUserId(User) != contact.UserId)
            {
                return BadRequest();
            }

            _context.Entry(contact).State = EntityState.Modified;

            try
            {
                await _context.SaveChangesAsync();
            }
            catch (DbUpdateConcurrencyException)
            {
                if (!ContactExists(id))
                {
                    return NotFound();
                }

                throw;
            }

            return new StatusCodeResult(StatusCodes.Status204NoContent);
        }