toggle switch check status change

toogle.cs

private void RadToggleSwitch_CheckedChanged(object sender, Telerik.Windows.Controls.CheckedChangedEventArgs e)
        {
            Telerik.Windows.Controls.RadToggleSwitch swtch = (Telerik.Windows.Controls.RadToggleSwitch)sender;
            if (swtch.IsChecked == true)
            {
                if (App.islocked)
                {
                    old_pin.Visibility = Visibility.Visible;
                    setpw.Visibility = Visibility.Visible;
                }
                else
                    setpw.Visibility = Visibility.Visible;
            }
            else
            {
                IsolatedStorageSettings.ApplicationSettings["islocked"] = false;
                IsolatedStorageSettings.ApplicationSettings["password"] = String.Empty;
                old_pin.Visibility = Visibility.Collapsed;
                setpw.Visibility = Visibility.Collapsed;
            }
        }