private void LoadcmbBN() { BenhNhanCtrl bnctr = new BenhNhanCtrl(); cmbMaBN.DataSource = bnctr.GetData(); cmbMaBN.DisplayMember = "MaBN"; txtTenBN.DataBindings.Clear(); txtTenBN.DataBindings.Add("Text", cmbMaBN.DataSource, "HoTen"); cmbMaBN.ValueMember = "MaBN"; }