Winnovative Excel Library for .NET

    protected void lnkBtnCreateWorkbook_Click(object sender, EventArgs e)
    {
        // get the Excel workbook format
        ExcelWorkbookFormat workbookFormat = radioXlsFormat.Checked ? ExcelWorkbookFormat.Xls_2003 : 
                    ExcelWorkbookFormat.Xlsx_2007;

        // create the workbook in the desired format with a single worksheet
        ExcelWorkbook workbook = new ExcelWorkbook(workbookFormat);

        // set the license key before saving the workbook
        workbook.LicenseKey = "RW51ZXZ0ZXVldGt1ZXZ0a3R3a3x8fHw=";

        // set workbook description properties
        workbook.DocumentProperties.Subject = "Getting started sample";
        workbook.DocumentProperties.Comments = "Getting started with Winnovative
            Excel library for .NET";

        #region CREATE CUSTOM WORKBOOK STYLES

        #region Add a style used for the cells in the worksheet title area

        ExcelCellStyle titleStyle = workbook.Styles.AddStyle("WorksheetTitleStyle");
        // center the text in the title area
        titleStyle.Alignment.HorizontalAlignment = ExcelCellHorizontalAlignmentType.Center;
        titleStyle.Alignment.VerticalAlignment = ExcelCellVerticalAlignmentType.Center;
        if (workbookFormat == ExcelWorkbookFormat.Xls_2003)
        {
            // set the solid fill for the title area range with a custom color
            titleStyle.Fill.FillType = ExcelCellFillType.SolidFill;
            titleStyle.Fill.SolidFillOptions.BackColor = Color.FromArgb(255, 255, 204);
        }
        else
        {
            // set the gradient fill for the title area range with a custom color
            titleStyle.Fill.FillType = ExcelCellFillType.GradientFill;
            titleStyle.Fill.GradientFillOptions.Color1 = Color.FromArgb(255, 255, 204);
            titleStyle.Fill.GradientFillOptions.Color2 = Color.White;
        }
        // set the title area font 
        titleStyle.Font.Size = 14;
        titleStyle.Font.Bold = true;
        titleStyle.Font.UnderlineType = ExcelCellUnderlineType.Single;

        #endregion
        
        #endregion

        // get the first worksheet in the workbook
        ExcelWorksheet worksheet = workbook.Worksheets[0];

        // set the default worksheet name
        worksheet.Name = "Hello World";

        #region WORKSHEET PAGE SETUP

        // set worksheet paper size and orientation, margins, header and footer
        worksheet.PageSetup.PaperSize = ExcelPagePaperSize.PaperA4;
        worksheet.PageSetup.Orientation = ExcelPageOrientation.Portrait;
        worksheet.PageSetup.LeftMargin = 1;
        worksheet.PageSetup.RightMargin = 1;
        worksheet.PageSetup.TopMargin = 1;
        worksheet.PageSetup.BottomMargin = 1;

        #endregion

        #region WRITE THE WORKSHEET TOP TITLE

        // merge the cells in the range to create the title area 
        worksheet["A2:G3"].Merge();
        // gets the merged range containing the top left cell of the range
        ExcelRange titleRange = worksheet["A2"].MergeArea;
        // set the text of title area
        worksheet["A2"].Text = "Say 'Hello World'
            in Different Languages";

        // set a row height of 18 points for each row in the range
        titleRange.RowHeightInPoints = 18;
        // set the worksheet top title style
        titleRange.Style = titleStyle;

        #endregion

        // SAVE THE WORKBOOK

        // Save the Excel document in the current HTTP response stream

        string outFileName = workbookFormat == ExcelWorkbookFormat.Xls_2003 ? "GettingStarted.xls" : 
                        "GettingStarted.xlsx";

        System.Web.HttpResponse httpResponse = System.Web.HttpContext.Current.Response;

        // Prepare the HTTP response stream for saving the Excel document

        // Clear any data that might have been previously buffered in the
            output stream
        httpResponse.Clear();

        // Set output stream content type for Excel 97-2003 (.xls) or Excel
            2007 (.xlsx)
        if (workbookFormat == ExcelWorkbookFormat.Xls_2003)
            httpResponse.ContentType = "Application/x-msexcel";
        else
            httpResponse.ContentType = "Application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";

        // Add the HTTP header to announce the Excel document either as an
            attachment or inline
        httpResponse.AddHeader("Content-Disposition", String.Format("attachment; filename={0}", 
            outFileName));

        // Save the workbook to the current HTTP response output stream
        // and close the workbook after save to release all the allocated
            resources
        try
        {
            workbook.Save(httpResponse.OutputStream);
        }
        finally
        {
            // close the workbook and release the allocated resources
            workbook.Close();
        }

        // End the response and finish the execution of this page
        httpResponse.End();
    }