How can I detect if a firewall product is enabled?

Question

How can I detect (from a Windows Forms application written in C#) if a firewall product is enabled?

Here is my code and i am getting error on INetFwMgr that type or namespace could not found

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }


        private const string CLSID_FIREWALL_MANAGER = "{304CE942-6E39-40D8-943A-B913C40C9CD4}"; 

       INetFwMgr manager = GetFireWallManager();
       bool isFirewallEnabled = manager.LocalPolicy.CurrentProfile.FirewallEnabled;



       private static INetFwMgr GetFireWallManager()
       {
           Type objectType = Type.GetTypeFromCLSID(new Guid(CLSID_FIREWALL_MANAGER));
           return Activator.CreateInstance(objectType) as INetFwMgr;
       }
        private void button1_Click(object sender, EventArgs e)
        {



            if (isFirewallEnabled == false)
           {
                MessageBox.Show("Firewall is not enabled.");
           }
           else
           {
                MessageBox.Show("Firewall is enabled.");
           }

        }
    }
}

Answer 1

NetFwMgrType = Type.GetTypeFromProgID("HNetCfg.FwMgr", false); 
INetFwMgr mgr = (INetFwMgr)Activator.CreateInstance(NetFwMgrType);
bool Firewallenabled = mgr.LocalPolicy.CurrentProfile.FirewallEnabled;

For details see a link.

http://technet.microsoft.com/en-us/library/cc737845%28WS.10%29.aspx

http://blogs.msdn.com/b/securitytools/archive/2009/08/21/automating-windows-firewall-settings-with-c.aspx

Answer 2

Have a look at this question here about antivirus How to detect antivirus installed on windows 2003 server and 2008 server 2003 server R2and 2008 server R2 using WMI or other then WMI in C++ the same API call can be used to detect firewall settings using the WSC_SECURITY_PROVIDER_FIREWALL enum. The answer there is actually wrong for that question, but it will give you the answer for non-server computers. That code is in C++, but it's just the windows API call you need, you can call that from C# too.