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I'm getting very confused about whether C# marshal's COM objects between threads. To this end I have an application which is loading a set of files in a task parallel fashion. I'm using the StaTaskScehduler to load the files using the COM object. Once the COM object is loaded I am storing the object in a central list. I then later try to perform some processing on this data, again using the STATaskScheduler. However at this point I hit a problem. I receive an exception as follows: An unhandled exception of type 'System.Runtime.InteropServices.InvalidComObjectException' occurred in MadCat.exe

I am working an SDK for a DSLR camera which has the following instructions: Notes on Developing Windows Applications When creating applications that run under Windows, a COM initialization is required for each thread in order to access a camera from a thread other than the main thread. To create a user thread and access the camera from that thread, be sure to execute CoInitializeEx( NULL, COINIT_APARTMENTTHREADED ) at the start of the thread and CoUnInitialize() at the end. Sample code is shown below. This is the same when controlling EdsVolumeRef or EdsDirectoryItemRef objects from another

Possible Duplicate: Could you explain STA and MTA? All ThreadPool threads are in the multithreaded apartment. --As per the MSDN What does that mean? I am really concerned with what the difference between the multi vs single threaded apartment model is. Or what does the apartment model mean? I have read the MSDN on it, and it doesn't really make sense to me. I think I may have an idea, but I was thinking someone on here could explain it in plain English. Thanks, Anthony D Update 1 Found this Could you explain STA and MTA? Can anyone be more descriptive? Update 2 I am also looking for an answer

I am using the technique shown in WebBrowser Control in a new thread Trying to get a screen-scrape of a webpage I have been able to get the following code to successfully work when the WebBrowser control is placed on a WinForm . However it fails by providing an arbitrary image of the desktop when run inside a thread. Thread browserThread = new Thread(() => { WebBrowser br = new WebBrowser(); br.DocumentCompleted += webBrowser1_DocumentCompleted; br.ProgressChanged += webBrowser1_ProgressChanged; br.ScriptErrorsSuppressed = true; br.Navigate(url); Application.Run(); }); browserThread