File in use when opening the word file again that was closed by killing the winword process using C#

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We open the word document programatically using Microsoft.Office.Interop.Word.Application. We update the document and then save it and close the document. It works fine but occassionally it is not able to close the document and quit the application (like if some dialog opens on the document requiring human intervention).

For such situation, we need to kill the word process that was used to open the document so that we can process other documents.

I found this solution file is used by another process in c sharp[^]

Using the code, I am able to find the process and then call process.kill() method to kill the winword process. It deletes the file, however if I try to open the file again, it pops up the File In Use dialog.

How to get away with this? Please help

Posted 23-Oct-13 5:33am

Savy17

Updated 23-Oct-13 5:34am

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Ranjan.D 23-Oct-13 11:38am

Do you close the application instance like below ?

application.Quit();

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Mike Meinz · Answer 1 · 2013-10-23T05:37:00

Using Process.Kill() is not the proper way to shutdown an application.

You may not be properly releasing all of the instantiated COM objects.

Calling a "Quit" or "Exit" method followed by a "Dispose" method on a COM object will not free up all of the references.

See How to Release COM Interop Objects so the Called Program Can Exit[^]

C#

// Call Quit() Method to start Word shutdown process
oApp.Quit();
Application.DoEvents();
//
// This sample has only one COM object declared.
//
// For programs with multiple COM objects declared, repeat the following four
// lines of code for each COM object in reverse order of creation.
//
while (System.Runtime.InteropServices.Marshal.ReleaseComObject(oApp) != 0) {
    Application.DoEvents();
}
oApp = null; // Set each COM Object to null
//
//
// After all of the COM objects have been released and set to null, do the following:
GC.Collect(); // Start .NET CLR Garbage Collection
GC.WaitForPendingFinalizers(); // Wait for Garbage Collection to finish