Generate PDF and Send Attachment throungh Mail

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.IO;
using System.Text;
using System.Data;
using System.Net;
using System.Net.Mail;
using iTextSharp.text;
using iTextSharp.text.pdf;
using iTextSharp.text.html.simpleparser;

public partial class CS : System.Web.UI.Page
{

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!this.IsPostBack)
        {
            DataTable dt = new DataTable();
            dt.Columns.AddRange(new DataColumn[3] {
                            new DataColumn("EmpId"),
                            new DataColumn("Call"),
                            new DataColumn("Time")});
            dt.Rows.Add("SAM123", "STD", "5:20");
            dt.Rows.Add("SAM124", "ISD", "7:20");
            dt.Rows.Add("SAM125", "LOCAL", "9:20");
            dt.Rows.Add("SAM126", "INTERNAL", "3:20");
            SendPDFEmail(dt);
        }
    }

    private void SendPDFEmail(DataTable dt)
    {
        using (StringWriter sw = new StringWriter())
        {
            using (HtmlTextWriter hw = new HtmlTextWriter(sw))
            {
                string companyName = "Mindtree Ltd.";
                string rtype = "admin";
                StringBuilder sb = new StringBuilder();
                sb.Append("<table width='100%' cellspacing='0' cellpadding='2'>");
                sb.Append("<tr><td align='center' style='background-color: #18B5F0' colspan = '2'><b>Mail Details</b></td></tr>");
                sb.Append("<tr><td colspan = '2'></td></tr>");
                sb.Append("<tr><td><b>Report Type:</b>");
                sb.Append(rtype);
                sb.Append("</td><td><b>Date: </b>");
                sb.Append(DateTime.Now);
                sb.Append(" </td></tr>");
                sb.Append("<tr><td colspan = '2'><b>Company Name :</b> ");
                sb.Append(companyName);
                sb.Append("</td></tr>");
                sb.Append("</table>");
                sb.Append("<br />");
                sb.Append("<table border = '1'>");
                sb.Append("<tr>");
                foreach (DataColumn column in dt.Columns)
                {
                    sb.Append("<th style = 'background-color: #D20B0C;color:#ffffff'>");
                    sb.Append(column.ColumnName);
                    sb.Append("</th>");
                }
                sb.Append("</tr>");
                foreach (DataRow row in dt.Rows)
                {
                    sb.Append("<tr>");
                    foreach (DataColumn column in dt.Columns)
                    {
                        sb.Append("<td>");
                        sb.Append(row[column]);
                        sb.Append("</td>");
                    }
                    sb.Append("</tr>");
                }
                sb.Append("</table>");
                StringReader sr = new StringReader(sb.ToString());

                Document pdfDoc = new Document(PageSize.A4, 10f, 10f, 10f, 0f);
                HTMLWorker htmlparser = new HTMLWorker(pdfDoc);
                using (MemoryStream memoryStream = new MemoryStream())
                {
                    PdfWriter writer = PdfWriter.GetInstance(pdfDoc, memoryStream);
                    pdfDoc.Open();
                    htmlparser.Parse(sr);
                    pdfDoc.Close();
                    byte[] bytes = memoryStream.ToArray();
                    memoryStream.Close();

                    MailMessage mm = new MailMessage("ranjeet@gmail.com", "ranjeet@gmail.com");
                    mm.Subject = "Mindtree Historical Weekly Mail";
                    mm.Body = "Report Mail";
                    mm.Attachments.Add(new Attachment(new MemoryStream(bytes), "admin.pdf"));
                    mm.IsBodyHtml = true;
                    SmtpClient smtp = new SmtpClient();
                    smtp.Host = "smtp.gmail.com";
                    smtp.EnableSsl = true;
                    NetworkCredential NetworkCred = new NetworkCredential();
                    NetworkCred.UserName = "ranjeet@gmail.com";
                    NetworkCred.Password = "xyz";
                    smtp.UseDefaultCredentials = true;
                    smtp.Credentials = NetworkCred;
                    smtp.Port = 587;
                    smtp.Send(mm);
                }
            }
        }
    }
}