private void frmCTHoaDon_Load(object sender, EventArgs e)
{
txtMaHD.Enabled = false;
txtNgayLap.Enabled = false;
cboBan.Enabled = false;
cboNV.Enabled = false;
txtTinhTrang.Enabled = false;
txtTongTien.Enabled = false;
cboNV.DataSource = nv.getDSNhanVien();
cboNV.DisplayMember = "HOTEN";
cboNV.ValueMember = "MANV";
cboBan.DataSource = b.getDSBan();
cboBan.DisplayMember = "TENBAN";
cboBan.ValueMember = "MABAN";
dgvCTHD.DataSource = hd.GetCTHD(ma);
txtMaHD.Text = hd.getTTHoaDon(ma).MAHD;
txtNgayLap.Text = hd.getTTHoaDon(ma).NGAYLAP.ToString();
cboNV.SelectedValue = hd.getTTHoaDon(ma).MANV;
cboBan.SelectedValue = hd.getTTHoaDon(ma).MABAN;
txtTinhTrang.Text = hd.getTTHoaDon(ma).TINHTRANG.ToString();
txtTongTien.Text = hd.TinhTong(ma).ToString();
LoadNuoc();
dgvCTHD.MouseClick += new MouseEventHandler(dgvCTHD_MouseClick);
}