private void danzhong_KeyPress(object sender, KeyPressEventArgs e)
 {
     e.Handled = TerminalCommon.isgoodnumber(danzhong, e);
 }
 private void feipin_KeyPress(object sender, KeyPressEventArgs e)
 {
     e.Handled = TerminalCommon.isgoodnumber(feipin, e);
 }