Export Datatable into PDF using asp.net c#

private void GeneratePDF(DataTable dataTable, string rptnm)

    {

        Document pdfDoc = new Document(PageSize.A2, 10f, 10f, 10f, 0f);

        System.IO.MemoryStream mStream = new System.IO.MemoryStream();

        PdfWriter writer = PdfWriter.GetInstance(pdfDoc, mStream);

        int cols = dataTable.Columns.Count;

        int rows = dataTable.Rows.Count;

        pdfDoc.Header = new HeaderFooter(new Phrase("Header Text”,false);

        pdfDoc.Open();

        iTextSharp.text.Table pdfTable = new iTextSharp.text.Table(cols, rows);

        pdfTable.BorderWidth = 1;pdfTable.Width = 100;

        pdfTable.Padding = 1;pdfTable.Spacing = 1;

        //creating table headers

        for (int i = 0; i < cols; i++)

        {

            Cell cellCols = new Cell();

            cellCols.BackgroundColor = new iTextSharp.text.Color(System.Drawing.ColorTranslator.FromHtml("#548B54"));

            iTextSharp.text.Font ColFont = FontFactory.GetFont(FontFactory.HELVETICA, 12, iTextSharp.text.Font.BOLD, iTextSharp.text.Color.WHITE);

            Chunk chunkCols = new Chunk(dataTable.Columns[i].ColumnName, ColFont);

            cellCols.Add(chunkCols);

            pdfTable.AddCell(cellCols);

        }

        //creating table data (actual result)

        for (int k = 0; k < rows; k++)

        {

            for (int j = 0; j < cols; j++)

            {

                Cell cellRows = new Cell();

                if (k % 2 == 0)

                {

                    cellRows.BackgroundColor = new iTextSharp.text.Color(System.Drawing.ColorTranslator.FromHtml("#cccccc")); ;

                }

                else { cellRows.BackgroundColor = new iTextSharp.text.Color(System.Drawing.ColorTranslator.FromHtml("#ffffff")); }

                iTextSharp.text.Font RowFont = FontFactory.GetFont(FontFactory.HELVETICA, 12);

                Chunk chunkRows = new Chunk(dataTable.Rows[k][j].ToString(), RowFont);

                cellRows.Add(chunkRows);

                pdfTable.AddCell(cellRows);

            }

        }

        pdfDoc.Add(pdfTable);

        pdfDoc.Close();

        Response.ContentType = "application/octet-stream";

        Response.AddHeader("Content-Disposition", "attachment; filename=Report.pdf");

        Response.Clear();

        Response.BinaryWrite(mStream.ToArray());

        Response.End();

    }