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Editorial Team
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Asked: 2026-05-20T01:04:09+00:00

How can we get the application window handle or process handle of the excel

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How can we get the application window handle or process handle of the excel process which belongs to the excel application instance that we have created?
We are using Interop.Excel.dll Version 1.3.0.0. The application class seem to have no HWnd property to call.

Note that it is no solution to simply find all processes with the name excel.exe because we have many excel instances running in parallel and we only want to close a certain instance.

Excel.Application app = new Excel.Application();
// .. do something with excel here
app.Quit();
GC.Collect();
GC.WaitForPendingFinalizers();
GC.Collect();
GC.WaitForPendingFinalizers();
// this is in some cases still not enough to get excel killed
uint processID;        
GetWindowThreadProcessId((IntPtr)hWnd, out processID); // how to get HWnd from this Excel application?
Process.GetProcessById((int)processID).Kill();
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1 Answer

  1. Editorial Team

    Although all the answers I got did not help, thanks for the answers anyway. I now found a workaround by myself:

    I now created a worker process which periodically checks for excel processes which are older than one minute. Since my excel processing should never last longer than one minute, I can be sure that excel processes older than one minute are done, so I can kill this process.

    An other way which comes now to my mind is to get a list of all excel processes before you instantiate your excel process. Then after instantiating you check again. The pid which is new, is the new excel process. Remember to put a lock statement around this to void multithreading issues.

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