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    <p>Shutting down your Microsoft Office application can seem tricky to get right at first, but once you establish the correct order of operations, it's actually not very hard at all. </p> <p>Releasing your MS Office application can be done safely and effectively in two stages:</p> <p>(1) First release all the minor objects to which you do not hold a reference within a named variable. You do this via a call to <a href="http://msdn.microsoft.com/en-us/library/system.gc.collect.aspx" rel="nofollow noreferrer">GC.Collect()</a> and then <a href="http://www.bing.com/search?setlang=en-US&amp;mkt=en-US&amp;q=gc.waitforpendingfinalizers" rel="nofollow noreferrer">GC.WaitForPendingFinalizers()</a> . Note that if you are using Visual Studio Tools for Office (VSTO), then you need to call this pair of commands <strong>twice</strong> in order to get the COM objects to successfully release. You are not using VSTO, however, so calling them once is sufficient.</p> <p>(2) Then explicitly release the objects which you hold via a named variable using a call to <a href="http://msdn.microsoft.com/en-us/library/system.runtime.interopservices.marshal.finalreleasecomobject.aspx" rel="nofollow noreferrer">Marshall.FinalReleaseComObject()</a> on each variable you have. </p> <p>Remember to explicitly release <strong>all</strong> variables that you have to COM components. If you miss even one, then your MS Office application will hang. In your code, you seem to have three named variables that hold a reference to your PowerPoint application: <code>ppApp</code>, <code>ppPres</code>, and <code>cell</code>.</p> <p>Taking this all into account, I think that your cleanup should look something like the following, which makes use of <code>using System.Runtime.InteropServices</code> either within the namespace or at the top of the code document:</p> <pre><code>// using System.Runtime.InteropServices // Cleanup: GC.Collect(); GC.WaitForPendingFinalizers(); Marshal.ReleaseComObject(cell); ppPres.Close(); Marshal.ReleaseComObject(ppPres); ppApp.Quit(); Marshal.ReleaseComObject(ppApp); </code></pre> <p>Give it a try, I think this should work for you... (If not, you might have to show even more of your code.) For further information, I give a detailed explanation on how to properly release an Excel application here: </p> <p><a href="https://stackoverflow.com/questions/158706/how-to-properly-clean-up-excel-interop-objects-in-c/159419#159419">How to properly clean up Excel interop objects in C#</a>.</p> <p>Hope this helps, let us know how it goes...</p> <p>-- Mike</p>
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    1. USMike Rosenblum
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    1. COHey Mike thanks, but this didn't worked. One thing I want to tell you is that when I close my own WinForm app, the PowerPoint closes too.
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    2. COYes it is normal for it to shut down when you close your WinForm because any objects that you failed to release are finally released when the runtime is torn down. You could try calling GC.Collect() and GC.WaitForPending() finalizers TWICE. This should not matter if you are not using VSTO, but it cannot hurt. You need to think about what other variables are at play here... (See next comment.)
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      1. USMike Rosenblum
    3. COYou need to think about what other variables are at play here, and release them. E.g.: (1) Are there any other static variables anywhere? (2) What does your InitializeCompany(ref comp, ppPres.Slides[slide]) call do? If it stores a reference to a PowerPoint slide within your company object, then this call along with companies.Add(comp) will create a permanent reference to a PowerPoint reference. These must be severed using a call to Marshal.FinalReleaseComObject() or else PowerPoint will hang. I don't know if this is what is happening, but you need to release *ALL* your PowerPoint references.
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