private void set_initial_form_load()
{
//m_txt_thang.Text = DateTime.Now.Month.ToString();
//m_txt_nam.Text = DateTime.Now.Year.ToString();
m_dat_thang.EditValue = DateTime.Now;
m_txt_nam = m_dat_thang.DateTime.Year;
m_txt_thang = m_dat_thang.DateTime.Month;
set_define_events();
}