Export DataTable Data to Excel in ASP.NET

In this article I will show you how to Data Table Data export to excel in asp.net c#. First you need to create a new web project or Web Site. Create a Data Table on page, and write code to bind the Data Table.

protected void ImgBtnDownLoad_Click(object sender, ImageClickEventArgs e)

    {

        ExportToExcel("Report.xlsx");

    }

    private void ExportToExcel(string strFileName)

    {

        DataTable dtData = new DataTable();
               SqlConnection objcon = new SqlConnection(“Enter your connection String”);
               SqlDataAdapter objda = new SqlDataAdapter("select * from Employee", objcon);
               objda.Fill(dtData);

        if (dtData.Rows.Count > 0)

        {

            Response.Clear();

            Response.AddHeader("content-disposition",   "attachment;filename=ExcelName.xls");

            Response.Charset = "";

            Response.ContentType = "application/vnd.xls";

            Response.Write(objComm.DownloadExcel(dtData));

            Response.End();

        }

        else

        {

            lblerror.Text = "There are no Records";

        }

    }

public System.Text.StringBuilder DownloadExcel(DataTable dtData)

        {

            System.Text.StringBuilder excelDoc = new System.Text.StringBuilder();

            const string startExcelXML = "<?xml version=\"1.0\"?>\r\n<Workbook " +

                  "xmlns=\"urn:schemas-microsoft-com:office:spreadsheet\"\r\n" +

                  " xmlns:o=\"urn:schemas-microsoft-com:office:office\"\r\n " +

                  "xmlns:x=\"urn:schemas-microsoft-com:office:" +

                  "excel\"\r\n xmlns:ss=\"urn:schemas-microsoft-com:" +

                  "office:spreadsheet\">\r\n <Styles>\r\n " +

                  "<Style ss:ID=\"Default\" ss:Name=\"Normal\">\r\n " +

                  "<Alignment ss:Vertical=\"Bottom\"/>\r\n <Borders/>" +

                  "\r\n <Font/>\r\n <Interior/>\r\n <NumberFormat/>" +

                  "\r\n <Protection/>\r\n </Style>\r\n " +

                  "<Style ss:ID=\"BoldColumn\">\r\n <Font " +

                  "x:Family=\"Swiss\" ss:Bold=\"1\"/>\r\n </Style>\r\n " +

                  "<Style     ss:ID=\"StringLiteral\">\r\n <NumberFormat" +

                  " ss:Format=\"@\"/>\r\n </Style>\r\n <Style " +

                  "ss:ID=\"Decimal\">\r\n <NumberFormat " +

                  "ss:Format=\"0.0000\"/>\r\n </Style>\r\n " +

                  "<Style ss:ID=\"Integer\">\r\n <NumberFormat " +

                  "ss:Format=\"0\"/>\r\n </Style>\r\n <Style " +

                  "ss:ID=\"DateLiteral\">\r\n <NumberFormat " +

                  "ss:Format=\"mm/dd/yyyy;@\"/>\r\n </Style>\r\n " +

                  "</Styles>\r\n ";

            const string endExcelXML = "</Workbook>";

            int rowCount = 0;

            int sheetCount = 1;

            excelDoc.Append(startExcelXML);

            excelDoc.Append("<Worksheet ss:Name=\"Sheet" + sheetCount + "\">");

            excelDoc.Append("<Table>");

            excelDoc.Append("<Row>");

            for (int x = 0; x < dtData.Columns.Count; x++)

            {

                excelDoc.Append("<Cell ss:StyleID=\"BoldColumn\"><Data ss:Type=\"String\">");

                excelDoc.Append(dtData.Columns[x].ColumnName);

                excelDoc.Append("</Data></Cell>");

            }

            excelDoc.Append("</Row>");

            foreach (DataRow x in dtData.Rows)

            {

                rowCount++;

                //if the number of rows is > 64000 create a new page to continue output

                if (rowCount == 64000)

                {

                    rowCount = 0;

                    sheetCount++;

                    excelDoc.Append("</Table>");

                    excelDoc.Append(" </Worksheet>");

                    excelDoc.Append("<Worksheet ss:Name=\"Sheet" + sheetCount + "\">");

                    excelDoc.Append("<Table>");

                }

                excelDoc.Append("<Row>"); //ID=" + rowCount + "

                for (int y = 0; y < dtData.Columns.Count; y++)

                {

                    System.Type rowType;

                    rowType = x[y].GetType();

                    switch (rowType.ToString())

                    {

                        case "System.String":

                            string XMLstring = x[y].ToString();

                            XMLstring = XMLstring.Trim();

                            XMLstring = XMLstring.Replace("&", "&amp;");

                            XMLstring = XMLstring.Replace(">", "&gt;");

                            XMLstring = XMLstring.Replace("\"", "&quot;");

                            XMLstring = XMLstring.Replace("'", "&apos;");

                            XMLstring = XMLstring.Replace("<", "&lt;");

                            excelDoc.Append("<Cell ss:StyleID=\"StringLiteral\">" +

                                           "<Data ss:Type=\"String\">");

                            excelDoc.Append(XMLstring);

                            excelDoc.Append("</Data></Cell>");

                            break;

                        case "System.Boolean":

                            excelDoc.Append("<Cell ss:StyleID=\"StringLiteral\">" +

                                        "<Data ss:Type=\"String\">");

                            excelDoc.Append(x[y].ToString());

                            excelDoc.Append("</Data></Cell>");

                            break;

                        case "System.Int16":

                        case "System.Int32":

                       

                        default:

                            throw (new Exception(rowType.ToString() + " not handled."));

                    }

                }

                excelDoc.Append("</Row>");

            }

            excelDoc.Append("</Table>");

            excelDoc.Append(" </Worksheet>");

            excelDoc.Append(endExcelXML);

            return excelDoc;

        }