void m_cmd_update_Click(object sender, EventArgs e)
{
var v_dr = m_grv.GetDataRow(m_grv.FocusedRowHandle);
US_GD_THU_NHAP_KHAC v_us = new US_GD_THU_NHAP_KHAC(CIPConvert.ToDecimal(v_dr[2].ToString()));
f304_tnk_ngoai_bang_luong_detail v_f = new f304_tnk_ngoai_bang_luong_detail();
v_f.display_for_update(v_us);
load_data_to_grid();
}