public static void Insert(ChitietHDBH ct)
 {
     if (conn.State == ConnectionState.Open) conn.Close();
     conn.Open();
     SqlCommand sc = new SqlCommand("CTHoadonbanhang_ProcInsert", conn);
     sc.CommandType = CommandType.StoredProcedure;
     sc.Parameters.Add(new SqlParameter("@HoadonbanhangID", ct.HoadonbanhangID));
     sc.Parameters.Add(new SqlParameter("@SanphamID", ct.SanphamID));
     sc.Parameters.Add(new SqlParameter("@Soluong", ct.Soluong));
     sc.Parameters.Add(new SqlParameter("@Dongia", ct.Dongia));
     sc.ExecuteNonQuery();
     conn.Close();
 }
 private void button1_Click(object sender, EventArgs e)
 {
     DialogResult dialog = MessageBox.Show("Bạn muốn thanh toán?","Thông báo",MessageBoxButtons.OKCancel,MessageBoxIcon.Question);
     if (dialog == DialogResult.OK)
     {
         Hoadonbanhang hd = new Hoadonbanhang();
         //hd.NhanvienID = Global.MaNV;
         hd.Ngayviet = DateTime.Now;
         hd.KhachhangID = (textBox1.Text==null||textBox1.Text==""?1:int.Parse(textBox1.Text));
         HoadonbanhangController.Insert(hd);
         int HoadonID = HoadonbanhangController.GetHoadonID(hd);
         foreach (ListViewItem item in listView1.Items)
         {
             ChitietHDBH ct = new ChitietHDBH();
             ct.HoadonbanhangID = HoadonID;
             ct.SanphamID = int.Parse(item.Text);
             ct.Soluong = int.Parse(item.SubItems[2].Text);
             ct.Dongia = double.Parse(item.SubItems[3].Text);
             ChitietHDBHController.Insert(ct);
         }
         MessageBox.Show("Thanh toán thành công!");
     }
 }