How to hide a panel? [closed]

Try something like this…

        newButton.Click += (o, ev) =>
        { 
            panelA.Visibility = System.Windows.Visibility.Hidden;
            panelB.Visibility = System.Windows.Visibility.Visible;
        }
        closeButton.Click += (o, ev) =>
        {
            panelB.Visibility = System.Windows.Visibility.Hidden;
            panelA.Visibility = System.Windows.Visibility.Visible;
        };