public void loaddata()
{
qltk.LayThongTin(dataGridViewTaiKhoan);
btn_Luu.Enabled = false;
btn_Huy.Enabled = false;
btn_Them.Enabled = true;
btn_Xoa.Enabled = true;
btn_Sua.Enabled = true;
this.txtMaNhanVien.Enabled = false;
this.txtMK.Enabled = false;
this.txtTenDN.Enabled = false;
this.txtTenDN.Enabled = true;
this.txtTenNV.Enabled = false;
this.cbbTrangThai.Enabled = false;
this.txtMK.ResetText();
this.txtMaNhanVien.ResetText();
this.cbbTrangThai.ResetText();
this.txtTenDN.ResetText();
this.txtTenNV.ResetText();
this.radioButtonNhanVien.Checked = false;
this.radioButtonQuanLi.Checked = false;
this.txtMaNhanVien.Enabled = false;
this.txtTenNV.Enabled = false;
}