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Import Data From a CSV File to an Excel Worksheet Using Winnovative Excel Library for .NET
This sample shows how to import data from a CSV file. Exporting from a worksheet to a CSV file is also possible. When the CSV file is imported there is the possibility to specify the range in worksheet where the data from CSV is imported, the workbook format (.xls or .xlsx), the text encoding in CSV file and the fields separator in CSV format.
Getting Started
Cells and Ranges
Cell Styles
Excel Data Types
Excel Charts
Adding Images
Adding Formulas
Data Validation
Load/Get DataTable
Import from CSV
Edit Workbooks
To create the Excel workbook first select the format of the generated workbook and press the Create Workbook button. The Excel workbook will be created on the server and sent as an attachment to the browser. You will be prompted to open the generated workbook in an exernal viewer. The free Excel Viewer from Microsoft supports both the Excel 97-2003 (.xls) format and the new Excel 2007 (.xlsx) format.
Workbook Format:
Create Workbook Button Create Excel Workbook 




protected void lnkBtnCreateWorkbook_Click(object sender, EventArgs e)
{
    // The data from CSV file (numbers, dates, etc) was saved for the
        English US culture and 
    // the CSV parser uses the current thread culture
    // Temporary set the en-US culture for the current thread and restore
        the old culture 
    // after the CSV file was loaded
    System.Globalization.CultureInfo oldCulture = System.Threading.Thread.CurrentThread.CurrentCulture;
    System.Threading.Thread.CurrentThread.CurrentCulture = new System.Globalization.CultureInfo("en-US");

    // get the Excel workbook format
    ExcelWorkbookFormat workbookFormat = radioXlsFormat.Checked ? ExcelWorkbookFormat.Xls_2003 : 
            ExcelWorkbookFormat.Xlsx_2007;

    // create the CSV stream
    string dataFilePath = System.IO.Path.Combine(Server.MapPath("~"), @"Data\awemployees.csv");
    System.IO.FileStream csvDataStream = new System.IO.FileStream(dataFilePath, System.IO.FileMode.Open);

    // load the data from the CSV stream to a new workbook in the specified
        format
    ExcelWorkbook workbook = ExcelWorkbook.LoadFromCsv(csvDataStream, Encoding.GetEncoding("windows-1252"), ","
                , 5, 1, workbookFormat, null);

    // close the CSV stream
    csvDataStream.Close();
    // restore the current culture
    System.Threading.Thread.CurrentThread.CurrentCulture = oldCulture;

    // customize the workbook

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

    // set workbook description properties
    workbook.DocumentProperties.Subject = "Import Data From CSV";
    workbook.DocumentProperties.Comments = 
            "Import Data From a CSV file to an Excel worksheet using 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.Left;
    titleStyle.Alignment.VerticalAlignment = ExcelCellVerticalAlignmentType.Center;
    // set the title area borders
    titleStyle.Borders[ExcelCellBorderIndex.Bottom].Color = Color.Green;
    titleStyle.Borders[ExcelCellBorderIndex.Bottom].LineStyle = ExcelCellLineStyle.Medium;
    titleStyle.Borders[ExcelCellBorderIndex.Top].Color = Color.Green;
    titleStyle.Borders[ExcelCellBorderIndex.Top].LineStyle = ExcelCellLineStyle.Medium;
    titleStyle.Borders[ExcelCellBorderIndex.Left].Color = Color.Green;
    titleStyle.Borders[ExcelCellBorderIndex.Left].LineStyle = ExcelCellLineStyle.Medium;
    titleStyle.Borders[ExcelCellBorderIndex.Right].Color = Color.Green;
    titleStyle.Borders[ExcelCellBorderIndex.Right].LineStyle = ExcelCellLineStyle.Medium;
    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

    #region Add a style used for the data header

    ExcelCellStyle dataHeaderStyle = workbook.Styles.AddStyle("DataHeaderStyle");
    dataHeaderStyle.Font.Size = 10;
    dataHeaderStyle.Font.Bold = true;
    dataHeaderStyle.Alignment.VerticalAlignment = ExcelCellVerticalAlignmentType.Center;
    dataHeaderStyle.Alignment.HorizontalAlignment = ExcelCellHorizontalAlignmentType.Left;
    dataHeaderStyle.Fill.FillType = ExcelCellFillType.SolidFill;
    dataHeaderStyle.Fill.SolidFillOptions.BackColor = Color.LightBlue;
    dataHeaderStyle.Borders[ExcelCellBorderIndex.Bottom].LineStyle = ExcelCellLineStyle.Thin;
    dataHeaderStyle.Borders[ExcelCellBorderIndex.Top].LineStyle = ExcelCellLineStyle.Thin;
    dataHeaderStyle.Borders[ExcelCellBorderIndex.Left].LineStyle = ExcelCellLineStyle.Thin;
    dataHeaderStyle.Borders[ExcelCellBorderIndex.Right].LineStyle = ExcelCellLineStyle.Thin;

    #endregion

    #endregion

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

    // set the default worksheet name
    worksheet.Name = "Import From CSV";

    #region WORKSHEET PAGE SETUP

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

    // add header and footer

    //display a logo image in the left part of the header
    string imagesPath = System.IO.Path.Combine(Server.MapPath("~"), @"Images");
    System.Drawing.Image logoImg = System.Drawing.Image.FromFile(System.IO.Path.Combine(imagesPath, "logo.jpg"));
    worksheet.PageSetup.LeftHeaderFormat = "&G";
    worksheet.PageSetup.LeftHeaderPicture = logoImg;
    // display worksheet name in the right part of the header
    worksheet.PageSetup.RightHeaderFormat = "&A";

    // add worksheet header and footer
    // display the page number in the center part of the footer
    worksheet.PageSetup.CenterFooterFormat = "&P";
    // display the workbook file name in the left part of the footer
    worksheet.PageSetup.LeftFooterFormat = "&F";
    // display the current date in the right part of the footer
    worksheet.PageSetup.RightFooterFormat = "&D";

    #endregion

    #region WRITE THE WORKSHEET TOP TITLE

    // merge the cells in the range to create the title area 
    worksheet["A2:N3"].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 = "Importing Data From
        CSV to an Excel Worksheet";

    // 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

    worksheet["A5:N5"].Style = dataHeaderStyle;
    worksheet["A5:N5"].RowHeightInPoints = 20;

    // lock the data table header
    worksheet["A6"].FreezePanes();

    // autofit column width
    worksheet.AutofitColumns();

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

    string outFileName = workbookFormat == ExcelWorkbookFormat.Xls_2003 ? "ImportFromCSV.xls" : 
                    "ImportFromCSV.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);
    }
    catch (Exception ex)
    {
        // report any error that might occur during save
        Session["ErrorMessage"] = ex.Message;
        Response.Redirect("ErrorPage.aspx");
    }
    finally
    {
        // close the workbook and release the allocated resources
        workbook.Close();

        #region Dispose the Image object

        if (logoImg != null)
            logoImg.Dispose();

        #endregion
    }

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