Excel spreadsheet library for C#/VB.NET

ExpertXls Excel Spreadsheet Library for .NET

Create Excel Spreadsheets in ASP.NET / C#

Import Data From a CSV File to an Excel Worksheet Using ExpertXls 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.
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 external viewer. ExpertXls library can generate both XLS and XLSX files.
Workbook Format:
Create Workbook Button Create Excel Workbook
Source Code:

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

using System.Text;
using System.Drawing;
using ExpertXls.ExcelLib;

public partial class ImportCSV : System.Web.UI.Page
    protected void Page_Load(object sender, EventArgs e)


    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
        // restore the current culture
        System.Threading.Thread.CurrentThread.CurrentCulture = oldCulture;

        // customize the workbook

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

        // 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 ExpertXls Excel library for .NET";


        #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);
            // 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;


        #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;



        // 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";



        // merge the cells in the range to create the title area 
        // 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;


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

        // lock the data table header

        // autofit column width

        // 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

        // Set output stream content type for Excel 97-2003 (.xls) or Excel 2007-2013 (.xlsx)
        if (workbookFormat == ExcelWorkbookFormat.Xls_2003)
            httpResponse.ContentType = "Application/x-msexcel";
            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
        catch (Exception ex)
            // report any error that might occur during save
            Session["ErrorMessage"] = ex.Message;
            // close the workbook and release the allocated resources

            #region Dispose the Image object

            if (logoImg != null)


        // End the response and finish the execution of this page

ExpertXls Excel Spreadsheet Library for .NET