Sumply return the path of AD when executed on a domain.

public string ActiveDirectoryPath()
{
	DirectoryEntry root = new DirectoryEntry("LDAP://RootDSE");
	using (root)
	{
		string dnc = root.Properties["defaultNamingContext"][0].ToString();
		string server = root.Properties["dnsHostName"][0].ToString();
		string adsPath = String.Format("LDAP://{0}/{1}", server, dnc);
		return adsPath;
	}
}

In a using code block eh? Is an object with a DirectoryEntry type disposable?

See: http://msdn.microsoft.com/en-us/library/system.directoryservices.directoryentry_members(VS.80).aspx and http://msdn.microsoft.com/en-us/library/yh598w02(VS.80).aspx