private void set_define_events()
{
this.Load += f351_quan_ly_cong_tac_de_Load;
this.FormClosed += f351_quan_ly_cong_tac_de_FormClosed;
this.KeyDown += f351_quan_ly_cong_tac_de_KeyDown;
m_cmd_save.Click += m_cmd_save_Click;
m_cmd_exit.Click += m_cmd_exit_Click;
}