How can I use events properly in multi-thread or WCF service-based applications?

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C#

WCF

event-handler

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I have device that provides some real-time events, the manufacturer give me a dll for use that events and develop programs based on that device.
here is some of properties and events of that dll:

    [ClassInterface(0)]
[ComSourceInterfaces("zkemkeeper._IZKEMEvents")]
[Guid("00853A19-BD51-419B-9269-2DABE57EB61F")]
[TypeLibType(2)]
public class CZKEMClass : IZKEM, CZKEM, _IZKEMEvents_Event
{
    public CZKEMClass();

    [DispId(79)]
    public virtual int AccGroup { get; set; }
    [DispId(76)]
    public virtual int BASE64 { get; set; }
    [DispId(2)]
    public virtual int CommPort { get; set; }
    [DispId(64)]
    public virtual int ConvertBIG5 { get; set; }
    [DispId(123)]
    public virtual int MachineNumber { get; set; }
    [DispId(78)]
    public virtual uint PIN2 { get; set; }
    [DispId(102)]
    public virtual int PINWidth { get; }
    [DispId(241)]
    public virtual int PullMode { get; set; }
    [DispId(1)]
    public virtual bool ReadMark { get; set; }
    [DispId(191)]
    public virtual int SSRPin { get; }

    public virtual event _IZKEMEvents_OnAlarmEventHandler OnAlarm;
    public virtual event _IZKEMEvents_OnAttTransactionEventHandler OnAttTransaction;
    public virtual event _IZKEMEvents_OnAttTransactionExEventHandler OnAttTransactionEx;
    public virtual event _IZKEMEvents_OnConnectedEventHandler OnConnected;
    public virtual event _IZKEMEvents_OnDeleteTemplateEventHandler OnDeleteTemplate;
    public virtual event _IZKEMEvents_OnDisConnectedEventHandler OnDisConnected;
    public virtual event _IZKEMEvents_OnDoorEventHandler OnDoor;
    public virtual event _IZKEMEvents_OnEMDataEventHandler OnEMData;
    public virtual event _IZKEMEvents_OnEmptyCardEventHandler OnEmptyCard;
    public virtual event _IZKEMEvents_OnEnrollFingerEventHandler OnEnrollFinger;
    public virtual event _IZKEMEvents_OnEnrollFingerExEventHandler OnEnrollFingerEx;
    public virtual event _IZKEMEvents_OnFingerEventHandler OnFinger;
    public virtual event _IZKEMEvents_OnFingerFeatureEventHandler OnFingerFeature;
    public virtual event _IZKEMEvents_OnHIDNumEventHandler OnHIDNum;
    public virtual event _IZKEMEvents_OnKeyPressEventHandler OnKeyPress;
    public virtual event _IZKEMEvents_OnNewUserEventHandler OnNewUser;
    public virtual event _IZKEMEvents_OnVerifyEventHandler OnVerify;
    public virtual event _IZKEMEvents_OnWriteCardEventHandler OnWriteCard;

they give me a sample code for realtime events like that:

if (this.RegEvent(this.iNo, 65535))//Here you can register the realtime events that you want to be triggered(the parameters 65535 means registering all)
        {
            _zkemkeeper.OnFinger += new zkemkeeper._IZKEMEvents_OnFingerEventHandler(axCZKEM1_OnFinger);
            _zkemkeeper.OnVerify += new zkemkeeper._IZKEMEvents_OnVerifyEventHandler(axCZKEM1_OnVerify);
            _zkemkeeper.OnAttTransactionEx += new zkemkeeper._IZKEMEvents_OnAttTransactionExEventHandler(axCZKEM1_OnAttTransactionEx);
            _zkemkeeper.OnFingerFeature += new zkemkeeper._IZKEMEvents_OnFingerFeatureEventHandler(axCZKEM1_OnFingerFeature);
            _zkemkeeper.OnEnrollFingerEx += new zkemkeeper._IZKEMEvents_OnEnrollFingerExEventHandler(axCZKEM1_OnEnrollFingerEx);
            _zkemkeeper.OnDeleteTemplate += new zkemkeeper._IZKEMEvents_OnDeleteTemplateEventHandler(axCZKEM1_OnDeleteTemplate);
            _zkemkeeper.OnNewUser += new zkemkeeper._IZKEMEvents_OnNewUserEventHandler(axCZKEM1_OnNewUser);
            _zkemkeeper.OnHIDNum += new zkemkeeper._IZKEMEvents_OnHIDNumEventHandler(axCZKEM1_OnHIDNum);
            _zkemkeeper.OnAlarm += new zkemkeeper._IZKEMEvents_OnAlarmEventHandler(axCZKEM1_OnAlarm);
            _zkemkeeper.OnDoor += new zkemkeeper._IZKEMEvents_OnDoorEventHandler(axCZKEM1_OnDoor);
            _zkemkeeper.OnWriteCard += new zkemkeeper._IZKEMEvents_OnWriteCardEventHandler(axCZKEM1_OnWriteCard);
            _zkemkeeper.OnEmptyCard += new zkemkeeper._IZKEMEvents_OnEmptyCardEventHandler(axCZKEM1_OnEmptyCard);
            _zkemkeeper.m_bRegisteredEvents = true;
            uLog("Ends");
        }

i can use this sample in my single-thread or a windows applications and it works and properly triggered that real-time events, but when i use it on multi-thread apps or in a service layer like a basic wcf service it doesn't work!
please help me

What I have tried:

I tried this code but it doesn't triggered events

public bool uRegEvents()
{
bool bResult = false;
bool bLock = false;
#if SEMAPHORE
if (m_axCZKEMLocker != this)
{
bLock = true;
m_axCZKEMLocker = this;
this.uWait();
}
#else
object lockObject = "string";
if (m_axCZKEMLocker != this)
{
bLock = true;
m_axCZKEMLocker = this;
lockObject = this;
}
lock(lockObject)
#endif
{
try
{
bResult = this.uRegEventsProtected(bResult);
}
catch(Exception ex)
{
bResult = uLog(ex.Message);
}
}
if (bLock)
{
#if SEMAPHORE
this.uRelease();
#endif
m_axCZKEMLocker = null;
}
return bResult;
}