C#

Public Function MyFunc(ByRef theDictionary As Dictionary) as Long
    ' ... do stuff 
End Function

public int CallMyFunc()
{
    Vb6Type vbObj = new Vb6TypeClass();

    Scripting.Dictionary vbDictionary = new Scripting.DictionaryClass();
    ...
    int retVal = vbObj.MyFunc(ref vbDictionary);
    ....
}

[DispId(1234)]
int MyFunc(ref Dictionary theDictionary);

public Service1()
{
    InitializeComponent();

    if (!System.Diagnostics.EventLog.SourceExists("AppNameLogSource"))
    {
        System.Diagnostics.EventLog.CreateEventSource("AppNameLogSource", "AppNameLog");
    }

    eventLog1.Source = "AppNameLogSource";
    eventLog1.Log = "AppNameLog";

}

// The main entry point for the process
static void Main()
{
    System.ServiceProcess.ServiceBase[] ServicesToRun;

    ServicesToRun = new System.ServiceProcess.ServiceBase[] { new AppNameService.Service1() };

    System.ServiceProcess.ServiceBase.Run(ServicesToRun);
}

protected override void OnStart(string[] args)
{
    eventLog1.WriteEntry("AppName Service has started");

    var worker = new Thread(AppNameService);
    worker.Name = ("AppNameServiceWorker");
    worker.IsBackground = false;
    worker.Start();

}

protected override void OnStop()
{
    eventLog1.WriteEntry("AppName Service has stopped.");
}

protected override void OnContinue()
{

    eventLog1.WriteEntry("AppName Service is continuing and working.");

}


void AppNameService()
{

    string sRetVal;
    string sRetVal2;
    string sFileName;
    string sImportDir;
    string sTypeImportFile;
    int iInt1;
    int iInt2;

    Boolean bolContinueService = true;

    sWinDir = System.Environment.GetEnvironmentVariable("windir");

    sRetVal = Get_AppSettings((sWinDir + "\\AppNameServiceAppSettings.ini"));

    do
    {
        try
        {

        sRetVal = Get_AppNameServiceList((sWinDir + sAppNameServiceListName));

        Boolean bolCompareValue = false;
        bolCompareValue = CompareStrings(sRetVal, "Success");
        if (bolCompareValue == true)
        {
            iInt1 = 0;
            do
            {

                (Run of a Subroutine that looks and sees if there are files to process.
                 It will set the bolFilesToProcess = True if it finds any files
                 Or set the bolFilesToProcess = False if there are not.)


                if (bolFilesToProcess == true)
                {
                    iInt1 = iNumberOfINIs; //Force end of Loop because found first File to Process.
                }
            }
            while (iInt1 < iNumberOfINIs);


            if (bolFilesToProcess == true)
            {
                eventLog1.WriteEntry("Call AppName to process new files found.");

                // Start the process with the info we specified.
                // Call WaitForExit and then the using statement will close.
                using (System.Diagnostics.Process exeProcess = System.Diagnostics.Process.Start(@sApp2Executable, @"/r"))
                {
                    exeProcess.WaitForExit();
                }

                eventLog1.WriteEntry("AppName completed processing of files.");

            }
        }


        }

        catch (Exception ex)
        {
             bolContinueService = false;

             sErrorMessage = "Error in AppName Service Continuous process Loop. Error: " + ex.Message;

             eventLog1.WriteEntry(sErrorMessage, EventLogEntryType.Error);
        }
        finally
        {
            GC.Collect();
        }

    }

    while (bolContinueService == true);

    eventLog1.WriteEntry("ContinueService Process has stopped due to Internal Service Error. - AppNameService ");
}

public string Join(string dns, string domain, string username, string password)
        {
            try
            {
                ManagementScope scope = new ManagementScope(@"\\" + dns + @"\root\CIMV2", conn);
                ManagementPath path = new ManagementPath("Win32_ComputerSystem");
                ManagementClass mgmtClass = new ManagementClass(scope, path, null);
                ManagementBaseObject inParams = mgmtClass.GetMethodParameters("JoinDomainOrWorkgroup");

                inParams["Name"]            = domain;
                inParams["UserName"]        = username;
                inParams["Password"]        = password;
                inParams["AccountOU"]       = null;
                inParams["FJoinOptions"]    = (UInt32)1;

                ManagementBaseObject outParams = mgmtClass.InvokeMethod("JoinDomainOrWorkgroup", inParams, null);
                string status = ReturnedValue.JoinDomainOrWorkgroup(Convert.ToInt32(outParams["ReturnValue"]));

                return status;
            }
            catch (Exception ex)
            {
                EventLog.WriteEntry("ADEM Application", ex.Message, EventLogEntryType.Error);
                return ex.Message;
            }
        }