.... here is some more information:

It is possible to invoke OPC Async Writes with the component – the calls will look, however, as synchronous calls in the API to your application. You can enforce OPC Async Writes by setting component properties as follows:

ClientMode.AllowSynchronousMethod = false;
ClientMode.AllowAsynchronousMethod = true;

Note: The QuickOPC-COM product includes a full notion of async calls in the API, with AsyncOperation objects; the same thing is not currently in QuickOPC.NET, but is considered for next version.

<span style="font-family: "Tahoma","sans-serif"; font-size: 10pt">From:<span style="font-family: "Tahoma","sans-serif"; font-size: 10pt"> D.
Sent: Monday, March 28, 2011 9:36 AM
To: Zbynek Zahradnik
Subject: Re-2: EasyOPC .NET

<span style="font-family: "Courier New"; color: black; font-size: 10pt">Dear Mr. Zahradnik,
<span style="font-family: "Courier New"; color: black; font-size: 10pt">[.....] I will come back on you, since the API is quite straightforward, even so I missed the capability to perform async writes - of course I can use the .NET background work capability, but why not make use of the OPC async interface instead.
<span style="font-family: "Courier New"; color: black; font-size: 10pt">
<span style="font-family: "Courier New"; color: black; font-size: 10pt">.....
<span style="font-family: "Courier New"; color: black; font-size: 10pt">D.