private void m_cmd_insert_Click(object sender, EventArgs e)
 {
     f304_tnk_ngoai_bang_luong_detail v_f = new f304_tnk_ngoai_bang_luong_detail();
     v_f.display_for_insert();
     load_data_to_grid();
 }
 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();
 }