private void set_define_events()
{
m_cmd_exit.Click += new EventHandler(m_cmd_exit_Click);
m_cmd_insert.Click += new EventHandler(m_cmd_insert_Click);
m_cmd_update.Click += new EventHandler(m_cmd_update_Click);
m_cmd_delete.Click += new EventHandler(m_cmd_delete_Click);
m_cmd_view.Click += new EventHandler(m_cmd_view_Click);
}