ExpandoObject with dynamic properties created at run time

public static ExpandoObject GetWMINameSpace(string name, bool local, ManagementScope scope = null)
        {
            if (scope != null &! local)
                if (!scope.IsConnected)
                    scope.Connect();
            var query = new ObjectQuery("SELECT * FROM " + name);
            var searcher = local ? new ManagementObjectSearcher(query) : new ManagementObjectSearcher(scope, query);
            dynamic resultSet = new ExpandoObject();
            var a = resultSet as IDictionary<String, object>;
            foreach (var o in searcher.Get().Cast<ManagementObject>())
            {
                foreach (var p in o.Properties)
                {
                    a[p.Name] = p.Value ?? "---";
                }
            }
            return resultSet;
        }

//USAGE
dynamic temp = CHLib.Remote.GetWMINameSpace("Win32_OperatingSystem",local,scope);
OS = temp.Caption.Replace("Microsoft Windows ", "");
OSArch = temp.OSArchitecture;