How to write data to excel and delete the file after import?

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Hi,

I have a requirement to use the template of an excel sheet placed on the server. When we click on Generate Report button on aspx page, the program should take a copy of the template and write data to it and give a download popup. After the file is downloaded the copy should be deleted in order to prevent the program storing files on the server.

I could do it with excel MIME type and rendering as excel but formatting is becoming very much difficult.

The reason for using template here is, it has lot of formatting work in it and also it contains a lot of conditional formatting rules.

I could use the template and write data to it and save a copy of it on the server using excel interop model. But the copy should not reside on the server permanently, it should be available only till the download completes.

How can I do this?

Thanks for your help..

Posted 3-Nov-11 2:49am

G.Srikanth

Updated 3-Nov-11 2:54am

v3

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2 solutions

Solution 1

Create a process that clears the files when a session ends or set it as a timer job that clears files at a certain time every day, or several times a day

Posted 3-Nov-11 2:59am

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G.Srikanth · Accepted Answer · 2011-11-03T20:35:00

Got a solution.

ApplicationClass excelApplication = null;
        Workbook newWorkbook = null;
        Worksheet targetSheet = null;

        string paramWorkbookPath = Server.MapPath("~/Files/Template.xls");
        string paramWorkbookPathNew = Server.MapPath("~/Files/" + System.Guid.NewGuid().ToString() + ".xls");
        object paramMissing = Type.Missing;

        excelApplication = new ApplicationClass();
        
        newWorkbook = excelApplication.Workbooks.Open(paramWorkbookPath, 1,
            false, paramMissing, paramMissing, paramMissing, false, paramMissing, paramMissing, false, true,
            paramMissing, false, true, XlCorruptLoad.xlNormalLoad);

        targetSheet = (Worksheet)(newWorkbook.Worksheets[1]);
        
        //Write data to the sheet
        targetSheet.get_Range("A7:E7", paramMissing).Value2 = "Srikanth";
        targetSheet.get_Range("A8:C8", paramMissing).Value2 = "Not available";

        newWorkbook.SaveAs(paramWorkbookPathNew, paramMissing, paramMissing, paramMissing, paramMissing, 
            paramMissing, XlSaveAsAccessMode.xlShared, paramMissing, paramMissing, paramMissing, paramMissing, paramMissing);
        
        // Release the references to the Excel objects.
        targetSheet = null;

        // Close the Workbook object.
        if (newWorkbook != null)
        {
            newWorkbook.Close(false, paramMissing, paramMissing);
            newWorkbook = null;
        }

        // Close the ApplicationClass object.
        if (excelApplication != null)
        {
            excelApplication.Quit();
            excelApplication = null;
        }

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

        Response.ClearContent();
        Response.AddHeader("Content-Disposition", "attachment;filename = KPI.xls");
        Response.ContentType = "application/vnd.ms-excel";
        //Transmit the excel file
        Response.TransmitFile(paramWorkbookPathNew);
        Response.Flush();
        //Delete the file
        System.IO.File.Delete(paramWorkbookPathNew);