void LoadData()
{
this.dataTable = BLAcc.getStaffAll();
this.dgvThongTinNV.DataSource = dataTable;
txtSearchBox.ResetText();
this.cbBoxOptionSearch.SelectedIndex = 4;
this.cbBoxOptionIDName.SelectedIndex = 2;
this.btnHuy.Enabled = false;
this.btnLuu.Enabled = false;
this.cbBoxChucVu.Enabled = false;
this.txtBoxHoTen.Enabled = false;
this.txtBoxLuong.Enabled = false;
this.txtID.Enabled = false;
this.dtpNamsinh.Enabled = false;
this.txtBoxCMND.Enabled = false;
this.btnThem.Enabled = true;
this.btnXoa.Enabled = true;
this.btnSua.Enabled = true;
this.btnReload.Enabled = true;
this.dgvThongTinNV.Enabled = true;
DgvThongTinNV_CellClick(null, null);
}