public ActionResult <OpvangContact> PostOpvangContact(OpvangContact item)
        {
            _repo.Create(item);
            _repo.Save();


            return(CreatedAtAction(nameof(GetOpvangContact), new { id = item.Id }, item));
        }
        public async Task <IActionResult> PutOpvangContact(long id, OpvangContact item)
        {
            if (id != item.Id)
            {
                return(BadRequest());
            }

            _context.Entry(item).State = EntityState.Modified;
            await _context.SaveChangesAsync();

            return(NoContent());
        }