public async Task <ActionResult <ViPhamGV> > PostViPhamGV(ViPhamGV viPhamGV)
        {
            _context.ViPhamGVs.Add(viPhamGV);
            await _context.SaveChangesAsync();

            return(CreatedAtAction("GetViPhamGV", new { id = viPhamGV.Id }, viPhamGV));
        }
        public async Task <IActionResult> PutViPhamGV(int id, ViPhamGV viPhamGV)
        {
            if (id != viPhamGV.Id)
            {
                return(BadRequest());
            }

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

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

            return(NoContent());
        }