private void tao_file_mau()
{
US_DUNG_CHUNG v_us = new US_DUNG_CHUNG();
DataSet v_ds = new DataSet();
v_ds.Tables.Add(new DataTable());
v_us.get_bang_cham_cong(v_ds, m_txt_chon_thang.Text, m_txt_chon_nam.Text);
var v_c_hsk = new DataColumn();
v_c_hsk.ColumnName = "HSK";
v_ds.Tables[0].Columns.Add(v_c_hsk);
m_grc_them_hs.DataSource = v_ds.Tables[0];
SaveXLSX();
}