Unable to close powerpoint application using office interop C#

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C#

Windows

Office

application

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Dear All,

We are automating MsOffice in winform application(C#).

Currently we are working on, to create a powerpoint file(Programmatically). We are successfully created pptx file.

After creating a pptx file, we are trying to close both the presentation and application. Its clsoing only presentation, but not ppt application.

MyCode

What I have tried:

private static void QuitApplication(PowerPointInterop.Application powerPointApplication)
        {
            if (powerPointApplication != null)
            {
                try
                {
                    powerPointApplication.DisplayAlerts = PowerPointInterop.PpAlertLevel.ppAlertsNone;
                    powerPointApplication.Visible = Microsoft.Office.Core.MsoTriState.msoFalse;
                    powerPointApplication.Quit();

                    Marshal.FinalReleaseComObject(powerPointApplication.Presentations);
                    Marshal.FinalReleaseComObject(powerPointApplication);

                    powerPointApplication = null;

                    GC.Collect();
                    GC.WaitForPendingFinalizers();

                    // GC needs to be called twice in order to get the Finalizers called  
                    // - the first time in, it simply makes a list of what is to be  
                    // finalized, the second time in, it actually is finalizing. Only  
                    // then will the object do its automatic ReleaseComObject.
                    GC.Collect();
                }
                catch (Exception)
                {
                    //Ignore
                }
            }
        }

public static bool CreateNewFile(IQuestion question, string filename)
        {
            WinUtil.DeleteFile(filename);
            if (File.Exists(filename))
                return false;

            PowerPointInterop.Application powerpointApplication = null;
            try
            {
                //Avoid screen flickering or unwanted alerts while initializing
                powerpointApplication = new PowerPointInterop.Application();

                // Create the Presentation File
                PowerPointInterop.Presentation pptPresentation = powerpointApplication.Presentations.Add(MsoTriState.msoTrue);               

                pptPresentation.SaveAs(filename, PowerPointInterop.PpSaveAsFileType.ppSaveAsDefault, MsoTriState.msoTriStateMixed);

                pptPresentation.Close();
                powerpointApplication.Quit();

                return true;
            }
            catch (Exception)
            {
                return false;
            }
            finally
            {
                QuitApplication(powerpointApplication);
            }
        }

Ref: Office C# app automates PowerPoint (CSAutomatePowerPoint) sample in C# for Visual Studio 2010[^]

can anyone please help me.

Thanks