public async Task <IActionResult> Putker_reference(long id, ker_reference ker_reference)
        {
            if (id != ker_reference.id)
            {
                return(BadRequest());
            }

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

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

            var lMsg  = new ServerUpdateHubMsg(_entity, ServerUpdateHubMsg.TOperation.UPDATE, id);
            var lJson = JsonConvert.SerializeObject(lMsg);
            await _hubContext.Clients.All.SendAsync(lMsg.entity, lJson);

            return(NoContent());
        }
        public async Task <ActionResult <ker_reference> > Postker_reference(ker_reference ker_reference)
        {
            _context.ker_reference.Add(ker_reference);
            await _context.SaveChangesAsync();

            var lMsg  = new ServerUpdateHubMsg(_entity, ServerUpdateHubMsg.TOperation.INSERT, ker_reference.id);
            var lJson = JsonConvert.SerializeObject(lMsg);
            await _hubContext.Clients.All.SendAsync(lMsg.entity, lJson);

            return(CreatedAtAction("Getker_reference", new { id = ker_reference.id }, ker_reference));
        }