wpf controls - Wpf button second click -

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i wanna ask second button_click event. have grid on window. when click button, wanna grid visible , when second clicked button.i wanna grid hidden. windows start menu. codes follows. in advance.

    private void topics_click(object sender, routedeventargs e)     {          tgrid.visibility = visibility.hidden;     }

why don't use current visibility determine whether hide or show it?

private void topics_click(object sender, routedeventargs e) {      tgrid.visibility = tgrid.visibility == visibility.hidden           ? visibility.visible : visibility.hidden; }

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