ManagementBaseObject

static ManagementBaseObject _win32OperatingSystem;
        static ManagementBaseObject OSManagementBaseObject {
            get {
                string queryOrClassName = "Win32_OperatingSystem";
                if(_win32OperatingSystem == null) {

                    SelectQuery query = new SelectQuery(queryOrClassName);
                    ManagementObjectCollection objects = new ManagementObjectSearcher(query).Get();
                    if(objects.Count <= 0) {
                        throw new InvalidOperationException("DiagnosticInfo_FullOSName");
                    }
                    ManagementObjectCollection.ManagementObjectEnumerator enumerator = objects.GetEnumerator();
                    enumerator.MoveNext();
                    _win32OperatingSystem = enumerator.Current;

                }
                return _win32OperatingSystem;
            }
        }