private void frmThemKhachHang_Load(object sender, EventArgs e)
        {
            LoaiKhachHangBUS bus = new LoaiKhachHangBUS();

            cbLoaiKH.DataSource    = bus.GetDataID_Ten();
            cbLoaiKH.DisplayMember = "tenLKH";
            cbLoaiKH.ValueMember   = "maLKH";
        }
        private void frmSuaKhachHang_Load(object sender, EventArgs e)
        {
            if (IsInsert == false)
            {
                DataTable dt = new DataTable();
                dt = khBus.GetDataByID(ID);

                txtTenKH.Text = dt.Rows[0]["tenKH"].ToString();
                txtSDT.Text   = dt.Rows[0]["sdtKH"].ToString();
                txtEmail.Text = dt.Rows[0]["emailKH"].ToString();
                //cbLoaiSP.DisplayMember = dt.Rows[0]["maLSP"].ToString();
                //cbLoaiSP.ValueMember = dt.Rows[0]["tenLSP"].ToString();
                //cbLoaiSP.DataSource = dt;
                txtDiaChi.Text = dt.Rows[0]["diachiKH"].ToString();
                txtGhiChu.Text = dt.Rows[0]["ghichuKH"].ToString();
                LoaiKhachHangBUS LoaiBus = new LoaiKhachHangBUS();
                cbLoaiKH.DataSource    = LoaiBus.GetDataID_Ten();
                cbLoaiKH.DisplayMember = "tenLKH";
                cbLoaiKH.ValueMember   = "maLKH";
            }
        }