WindowsActivationStatus

//Call the method like this:
ActivationStatus OSLicenseStatus = WindowsActivationStatus()


    public static ActivationStatus WindowsActivationStatus()
    {
        ActivationStatus activation = new ActivationStatus();
        ConnectionOptions ConnOptions = GetConnectionOptions();
        SelectQuery mQuery = new SelectQuery("SELECT * FROM SoftwareLicensingProduct WHERE LicenseStatus = 1");
        EnumerationOptions mOptions = GetEnumerationOptions(false);
        ManagementScope mScope = new ManagementScope(@"\\" + Environment.MachineName + @"\root\CIMV2", ConnOptions);
        mScope.Connect();

        using (ManagementObjectSearcher moSearcher = new ManagementObjectSearcher(mScope, mQuery, mOptions))
        {
            foreach (ManagementObject moMonitor in moSearcher.Get())
            {
                activation.ApplicationID = moMonitor["ApplicationID"]?.ToString();
                activation.Description = moMonitor["Description"]?.ToString();
                activation.ID = moMonitor["ID"]?.ToString();
                activation.LicenseFamily = moMonitor["LicenseFamily"]?.ToString();
                activation.LicenseStatus = ((ActivationStatus.LicenseStatusValue)moMonitor["LicenseStatus"]).ToString();
                activation.OSName = moMonitor["Name"]?.ToString();
                activation.OfflineInstallationId = moMonitor["OfflineInstallationId"]?.ToString();
                activation.PartialProductKey = moMonitor["PartialProductKey"]?.ToString();
                activation.ProductKeyID = moMonitor["ProductKeyID"]?.ToString();
                activation.VolumeLicensetivationInterval = moMonitor["VLActivationInterval"]?.ToString();
            }
        }
        return activation;
    }

    public class ActivationStatus
    {
        public enum LicenseStatusValue : UInt32
        {
            Unlicensed = 0,
            Licensed,
            OutOfBoxGrace,
            OutOfToleanceGrace,
            NonGenuineGrace,
            Notification
        }

        public string ApplicationID { get; set; }
        public string Description { get; set; }
        public DateTime EvaluationEndDate { get; set; }
        public string ID { get; set; }
        public string LicenseFamily { get; set; }
        public string LicenseStatus { get; set; }
        public string OSName { get; set; }
        public string OfflineInstallationId { get; set; }
        public string PartialProductKey { get; set; }
        public string ProductKeyID { get; set; }
        public string VolumeLicensetivationInterval { get; set; }
    }

    private static EnumerationOptions GetEnumerationOptions(bool DeepScan)
    {
        EnumerationOptions mOptions = new EnumerationOptions()
        {
            Rewindable = false,        //Forward only query => no caching
            ReturnImmediately = true,  //Pseudo-async result
            DirectRead = true,
            EnumerateDeep = DeepScan
        };
        return mOptions;
    }

    private static ConnectionOptions GetConnectionOptions()
    {
        ConnectionOptions ConnOptions = new ConnectionOptions()
        {
            EnablePrivileges = true,
            Timeout = ManagementOptions.InfiniteTimeout,
            Authentication = AuthenticationLevel.PacketPrivacy,
            Impersonation = ImpersonationLevel.Impersonate,
        };
        return ConnOptions;
    }