private void load_data_to_grid()
{
US_GD_CAC_KHOAN_TIEN_KHAC v_us = new US_GD_CAC_KHOAN_TIEN_KHAC();
var v_dt_source = v_us.LayDuLieuTheoThang(lay_thang(), lay_nam(), lay_loai_tien_khac());
m_lbl_thang.Text = lay_thang() + "/" + lay_nam() + "-" + m_cmb_khoan_tien.DisplayMember;
m_grc_main.DataSource = v_dt_source;
m_grc_main.RefreshDataSource();
}