private void lkup_NhaCungCap_EditValueChanged(object sender, System.EventArgs e) { txt_DiaChi.Text = ""; txt_SoDienThoai.Text = ""; if (lkup_NhaCungCap.EditValue == null) { return; } NHA_CUNG_CAP _ncc = _nhaCungCapBLL.LayNhaCungCapByID(int.Parse(lkup_NhaCungCap.EditValue.ToString())); txt_DiaChi.Text = _ncc.Dia_Chi == null ? "" : _ncc.Dia_Chi; txt_SoDienThoai.Text = _ncc.So_Dien_Thoai == null ? "" : _ncc.So_Dien_Thoai; }