com-interop

Retrieving the COM class factory for component with CLSID {XXXX} failed due to the following error: 80040154

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I developed a Windows service using C#.NET to generate PDF report. To generate PDF file I am using a third party dll. The application is running in my Windows XP platform. When I deployed the service in Windows Server 2008 64 bit version, I got this error: Retrieving the COM class factory for component with … Read more

How do I properly clean up Excel interop objects?

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I’m using the Excel interop in C# (ApplicationClass) and have placed the following code in my finally clause: while (System.Runtime.InteropServices.Marshal.ReleaseComObject(excelSheet) != 0) { } excelSheet = null; GC.Collect(); GC.WaitForPendingFinalizers(); Although this kind of works, the Excel.exe process is still in the background even after I close Excel. It is only released once my application is … Read more