Export ASPX Page to PDF and send it as Attachment in email

I want to send aspx page via email. So i converted it into pdf. The problrm is the pdf is getting created before the data is saved. So when i open the pdf my testboxes are empty. Please find me a solution. Below is the code am using. Also i want to send the pdf file as attachment.

 protected void SendMail()        {
            var userName = "anusha-4.n-4@cognizant.com";           
            var toAddress = YourEmail.Text.ToString();            
            const string Password = "Mypassword123#";          
            string subject = YourSubject.Text.ToString();
            string body = "From: " + YourName.Text + "\n";
            body += "Email: " + YourEmail.Text + "\n";
            body += "Subject: " + YourSubject.Text + "\n";
            body += "Question: \n" + Comments.Text + "\n";           
            var smtp = new System.Net.Mail.SmtpClient();            {
                smtp.Host = "10.238.52.200";                smtp.Port = 25;
                smtp.EnableSsl = false;
                smtp.DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network;
                smtp.Credentials = new NetworkCredential(userName, Password);
                smtp.Timeout = 20000;            }
            smtp.Send(userName, toAddress, subject, body);        }
         protected void Button1_Click(object sender, EventArgs e)        {
            Response.ContentType = "application/pdf"; 
            Response.AddHeader("content-disposition", "attachment;filename=TestPage.pdf");
            Response.Cache.SetCacheability(HttpCacheability.NoCache); 
            StringWriter sw = new StringWriter(); HtmlTextWriter hw = new HtmlTextWriter(sw); 
            this.Page.RenderControl(hw); 
            StringReader sr = new StringReader(sw.ToString());
            Document pdfDoc = new Document(PageSize.A4, 10f, 10f, 100f, 0f); 
            HTMLWorker htmlparser = new HTMLWorker(pdfDoc);
            PdfWriter.GetInstance(pdfDoc, Response.OutputStream); 
            pdfDoc.Open();             htmlparser.Parse(sr);            
            Response.Write(pdfDoc);                        try            {
                 SendMail();               
                DisplayMessage.Text = "Your Comments after sending the mail";
                DisplayMessage.Visible = true;
                YourSubject.Text = "";                YourEmail.Text = "";
                YourName.Text = "";                Comments.Text = "";
                pdfDoc.Close();                Response.End();            }
            catch (Exception) { }        }            }          }