I had also posted this in the forum, here was my post. Thanks

...

Hi, when I try to perform a refresh with the sample AE client that is bundled with "OPC .NET API 2.00 Source Code.msi" I receive the following error.

E_FAIL
IOPCEventSubscriptionMgt.Refresh

I am connecting to a Cyberlogic AE server and have asked them about this and their response was that the problem lies in the file OpcCom.Ae.Subscription.cs

Code:

public void Refresh()
{
lock (this)
{
// verify state and arguments.
if (m_subscription == null) throw new NotConnectedException();

            // invoke COM method. 
            try 
            { 
                  ((IOPCEventSubscriptionMgt)m_subscription).Refresh(0); 
            } 
            catch (Exception e) 
            { 
                  throw 

OpcCom.Interop.CreateException("IOPCEventSubscriptionMgt.Refresh", e);
}
}
}

They went on to say...

Quote:

As you can see, the Refresh() function always uses 0 for the dwConnection parameter rather than the value returned from the Advise() function call (For example, in the debug run here the correct value should have been a 1 instead.). This is why we return E_FAIL.

How can I resolve this issue?

Thanks,
Bill