![]() So, no matter how many references you have to a specific COM object, there will always be just one Runtime Callable Wrapper for it. Net runtime creates one RCW for each COM object. Net framework automatically wraps it in a Runtime Callable Wrapper, the RCW object is also responsible for controlling the objects’ lifetime. When you access an Office COM object via the interop assemblies, the. Quit ( ) } finally ReleaseComObject & FinalReleaseComObject? Let’s look at how to change the code in order to safely dispose of any COM objects: Excel. You must ALWAYS release COM objects, even if you see no adverse effects, it might work perfectly on your PC but behave entirely different on a user’s computer. ![]() This strange phenomenon occurs because in the above code, we’re not releasing any COM objects and we’re also “chaining” object references by using double dots. However, even after calling the Quit method of the Excel.Application object, you’ll still see the Excel.exe process in the Windows Task Managers’ list of background processes. The code above will build and run without a problem, it will create a new Excel workbook, add a new sheet and set the value of the first cell in the newly created sheet. I’m sure you’re staring at your screen with wide-eyed confusion at the moment, but this rule is actually very easy to explain. Both articles contain a lot of very useful and thorough advice and you’ll notice that it all starts with a simple rule: ![]() ![]() Our very own Andrei Smolin wrote two great articles explaining the reasons behind why Excel does not quit and when to release COM objects in.
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