Edit Embedded Chart in Worksheet Template

Setting:

• Language - C#
• Library - OfficeOpenXml (DocumentFormat.OpenXML)
• Microsoft Office 2010

Hi guys,

I'm developing a project that deals with YTD reports.  The application uses workbook templates that are to be edited programmatically.  So, basically, one workbook template for one kind of report.  

In a workbook template, there is a worksheet template that has pre-embedded charts in it.  This worksheet template is to be copied over a number of times, and then deleted so that the client won't see it in the generated report.

I open the generated report, and Excel 2010 tells me that the file has unreadable content and asks me if I wish to have them recovered on the fly.  I click Yes.  It pops out a small window that says "Excel was able to open the file by repairing or removing the unreadable content.  Removed Feature: Named range from /xl/workbook.xml part (Workbook)", and I close it.  The values in the generated report seems accurate and I think it's not affected by the error message shown earlier.  I save and overwrite the file, and when I open it again, the error message does not show up because it is saved as a repaired file now.

I tried commenting out the part that copies the worksheet template over a number of times then deletes it, and opening the generated report doesn't show up an error message.  I asked the client if that would be okay since the values are not affected, but they insist it would be much better if the end-user sees no error message at all.

Kindly assess the code below:

// Get data from the database.
DataTable dtResults = Database.Read(@"SELECT [Retailer]
                                      FROM [" + Database.RETAILERS + @"]
                                      WHERE [Trade Class] = 'Department / Specialty'
                                      ORDER BY [Retailer] ASC");
if (dtResults.Rows.Count > 0)
{
    foreach (DataRow row in dtResults.Rows)
    {
        if (worker.CancellationPending)
        {
            booCancel = true;
        }
        else
        {
            intRowCounter += 1;
            // Display worksheet title in progress bar.
            worker.ReportProgress(((6 * 100) / intTotalReports), "[" + row["Retailer"].ToString() + "]");

            // Filter invalid characters in string used as worksheet name.
            string wsName = Util.formatAsExcelTabName(row["Retailer"].ToString() + " - Fragrance");
            // Copy the worksheet template with the validated name above.
            package.Workbook.Worksheets.Copy("Dept-Spec Retailer - Fragrance", wsName);
            // This is where the charts in the copied worksheet are edited.  Definition found below.
            ws = rDetail(package, "Fragrance", "Department / Specialty", row["Retailer"].ToString(), row["Retailer"].ToString().ToUpper() + " - FRAGRANCE");
            // Move the copied worksheet to the end of the workbook.
            package.Workbook.Worksheets.MoveToEnd(wsName);
        }
    }
}
// Delete the worksheet template after.
package.Workbook.Worksheets.Delete("Dept-Spec Retailer - Fragrance");

=====================================================================

protected static ExcelWorksheet rDetail(ExcelPackage p, string strMajorCategory, string strTradeClass, string strRetailer, string strSheetTitle)
{
    [...]

    string strSpacesToCenter = "                             ";
    ExcelChart chart = ((ExcelChart)ws.Drawings[0]);
    chart.Series.Chart.Locked = false;
    chart.Title.Text = strSpacesToCenter.Substring(0, strSpacesToCenter.Length - strSheetTitle.Length) + "Monthly Trend - \"" + strSheetTitle + "\"";
    chart.Series[0].Header = strSheetTitle;
    chart.Series[0].Series = "$C$89:$O$89";

    chart = ((ExcelChart)ws.Drawings[2]);
    chart.Series.Chart.Locked = false;
    chart.Title.Text = strSpacesToCenter.Substring(0, strSpacesToCenter.Length - strSheetTitle.Length) + "Monthly Blend - \"" + strSheetTitle + "\"";
    chart.Series[0].Series = "$C$93:$N$93";
    chart.Series[1].Series = "$C$94:$N$94";

    chart = ((ExcelChart)ws.Drawings[3]);
    chart.Series.Chart.Locked = false;
    chart.Title.Text = strSpacesToCenter.Substring(0, strSpacesToCenter.Length - strSheetTitle.Length) + "\"" + strSheetTitle + "\" - Last Year Share";
    chart.Series[0].Series = "$V$41:$V$" + (intRowCounter - 1).ToString();
    chart.Series[0].XSeries = "$S$41:$S$" + (intRowCounter - 1).ToString();

    chart = ((ExcelChart)ws.Drawings[1]);
    chart.Series.Chart.Locked = false;
    chart.Title.Text = strSpacesToCenter.Substring(0, strSpacesToCenter.Length - strSheetTitle.Length) + "\"" + strSheetTitle + "\" - This Year Share";
    chart.Series[0].Series = "$X$41:$X$" + (intRowCounter - 1).ToString();
    chart.Series[0].XSeries = "$T$41:$T$" + (intRowCounter - 1).ToString();

    [...]
}

I would very much appreciate any light shed on this matter.  Frustrations are running high.  Haha.

Thanks,