C#- Showing Errors while disabling firewall using c#?

C#- Showing Errors while disabling firewall using c#?

I am trying to get status of windows firewall. I am successful in doing
so. and also able to ON/ Enable the OFF/ Disabled Firewall.
But when i am Disabling the firewall using my code it is showing this error
Please tell me how could i make it possible.
Code is here
private void toggleButton1_Checked(object sender, RoutedEventArgs e)
{
toggleButton1.Content = "On";
toggleButton1.Background = Brushes.LawnGreen;
INetFwMgr mgr = (INetFwMgr)Activator.CreateInstance(NetFwMgrType);
mgr.LocalPolicy.CurrentProfile.FirewallEnabled = true;
}
private void toggleButton1_Unchecked(object sender, RoutedEventArgs e)
{
toggleButton1.Content = "Off";
toggleButton1.Background = Brushes.Red;
INetFwMgr mgr = (INetFwMgr)Activator.CreateInstance(NetFwMgrType);
mgr.LocalPolicy.CurrentProfile.FirewallEnabled=false;
}
Thank you