C# Winform How to Properly Dispose Excel / Interop?

Question

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Hello, here's the scenario:

Im using datagridview to export data to Excel, after many times of exporting, i have noticed that my computer become slow, and check the Processes and i saw that there's too many Excel.exe running. What i did is I closed the Application and it removes on the process.

My Question is, how to properly dispose the Excel, After exporting data, so i wont quit my application everytime. My code below:

C#

Microsoft.Office.Interop.Excel._Application Excel = new Microsoft.Office.Interop.Excel.Application();

                  Workbook wb = Excel.Workbooks.Add(XlSheetType.xlWorksheet);

                  Worksheet ws = (Worksheet)Excel.ActiveSheet;

                  //ws.PageSetup.Zoom = false;

                  //ws.PageSetup.FitToPagesTall = 1;
                  //ws.PageSetup.FitToPagesWide = 1;

                  Excel.Visible = true;

                  ws.Cells.EntireColumn.AutoFit();
                  ws.Cells.EntireRow.AutoFit();
                  ws.Cells.Style.HorizontalAlignment = Microsoft.Office.Interop.Excel.XlHAlign.xlHAlignLeft; // Align cells to lef (excel)(

Please use my code for the revision . thanks

Posted 5-Jan-16 15:16pm

Rencyrence

Updated 14-Jul-20 2:30am

v2

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4 solutions

Solution 3

EXCEL and WORD are very and unmanaged objects, so GC is unable to collect them In EXCEL case first we need to we need to use 'Marshal.ReleaseComObject' method to release COM object or each sheet and then we need to dispose EXCEL Workbook first and then quit to EXCEL application object
see below cleanup group

C#

// Cleanup
GC.Collect();
GC.WaitForPendingFinalizers();

Marshal.FinalReleaseComObject(xlRng);
Marshal.FinalReleaseComObject(xlSheet);

xlBook.Close(Type.Missing, Type.Missing, Type.Missing);
Marshal.FinalReleaseComObject(xlBook);

xlApp.Quit();
Marshal.FinalReleaseComObject(xlApp);

Posted 5-Jan-16 17:32pm

koolprasad2003

Solution 2

Since you have used Excel.Visible = true, excel will be visible to the user on screen. So what to do with the excel on screen is up to the user. User can either save it and close it or just discard it without saving. And when the user closes the excel the program, the process also should be closed/terminated.

Posted 5-Jan-16 16:10pm

Mathi Mani

Solution 4

Above all solution are correct only one thing missing, still in the background task excel empty object still run for remove that you can put below code at last:

Process[] excelProcesses = Process.GetProcessesByName("excel");
        foreach (Process p in excelProcesses)
        {
            if (string.IsNullOrEmpty(p.MainWindowTitle)) // use MainWindowTitle to distinguish this excel process with other excel processes 
            {
                p.Kill();
            }
        }

Posted 14-Jul-20 2:30am

Member 10187249

Comments

CHill60 14-Jul-20 8:50am

Not so, if done properly. However, if you are going to copy solutions from other sites it's nice to credit them c# - How can I dispose my Excel Application - Stack Overflow[^]

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Abhinav S · Accepted Answer · 2016-01-05T15:42:00

Solution 1

Try How to properly release Excel COM objects: C# code examples[^].

Posted 5-Jan-16 15:42pm

Abhinav S

Comments

Rencyrence 5-Jan-16 22:20pm

Thank you it helps me alot!