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POPowerPoint Launched via C# does not Quit
 

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    <p>Hey I'm automating PowerPoint and Excel from a C# WinForms application; what I do is read slides from PowerPoint and save them in Excel and then quit both apps. Excel quits successfully but PowerPoints doesn't quits. The problem is when I convert first time it doesnt quits, but when I convert again it does.</p> <p>Here is my code</p> <pre><code>try { PowerPoint.Application ppApp; PowerPoint.Presentation ppPres; List&lt;Company&gt; companies = new List&lt;Company&gt;(); ppApp = new PowerPoint.Application(); ppApp.Visible = Microsoft.Office.Core.MsoTriState.msoTrue; ppApp.WindowState = Microsoft.Office.Interop.PowerPoint.PpWindowState.ppWindowMinimized; ppPres = ppApp.Presentations.Open(fileTxtBox.Text, Microsoft.Office.Core.MsoTriState.msoFalse, Microsoft.Office.Core.MsoTriState.msoFalse, Microsoft.Office.Core.MsoTriState.msoTrue); int slides = ppPres.Slides.Count; for (int slide = 1; slide &lt;= slides; slide++) { int rows = 1; PowerPoint.Cell cell; int shape = 1; for (; shape &lt; ppPres.Slides[slide].Shapes.Count; shape++) { if (ppPres.Slides[slide].Shapes[shape].HasTable == Microsoft.Office.Core.MsoTriState.msoTrue) { cell = ppPres.Slides[slide].Shapes[shape].Table.Cell(1, 1); if (cell.Shape.TextFrame.TextRange.Text.Trim().ToLower().Contains("realized")) { rows = ppPres.Slides[slide].Shapes[shape].Table.Rows.Count; break; } } } Company comp = new Company(rows); InitializeCompany(ref comp, ppPres.Slides[slide]); companies.Add(comp); } SaveInExcel(companies); ppPres.Close(); ppPres = null; ppApp.Quit(); ppApp = null; return; } catch (Exception ex) { MessageBox.Show(ex.Message); } finally { GC.Collect(); GC.WaitForPendingFinalizers(); } </code></pre>
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