private void set_define_events()
{
m_cmd_tai_file_mau.Click += m_cmd_tai_file_mau_Click;
m_cmd_chon_du_lieu.Click += m_cmd_chon_du_lieu_Click;
m_cmd_luu_cham_cong_lam_them.Click += m_cmd_luu_cham_cong_lam_them_Click;
m_txt_thang.EditValueChanged += m_txt_thang_EditValueChanged;
m_txt_nam.EditValueChanged += m_txt_nam_EditValueChanged;
}