private void Button1_Click(object sender, EventArgs e)
        {
            string name = cmbPackets.SelectedItem.ToString();



            foreach (string nameServices in listServices.CheckedItems)
            {
                int idservice = _context.Services.First(s => s.ServiceNames == nameServices).Id;
                int id        = _context.Packets.FirstOrDefault(p => p.PacketName == name).Id;



                PacketToServy packetToServy = new PacketToServy();



                packetToServy.PacketsId = id;
                packetToServy.ServiceId = idservice;
                _context.PacketToServies.Add(packetToServy);
            }


            //string nameservice = listServices.SelectedItems.ToString();



            _context.SaveChanges();
            FillDataGrid();
        }
        private void Button2_Click(object sender, EventArgs e)
        {
            string name = cmbPackets.Text;
            int    id   = _context.Packets.FirstOrDefault(p => p.PacketName == name).Id;

            foreach (string nameServices in listServices.CheckedItems)
            {
                int idservice = _context.Services.First(s => s.ServiceNames == nameServices).Id;


                PacketToServy selectedService = _context.PacketToServies.FirstOrDefault(pts => pts.PacketsId == id && pts.ServiceId == idservice);
                _context.PacketToServies.Remove(selectedService);
            }
            ;
            _context.SaveChanges();


            FillDataGrid();
        }