Sending email With Attachment from Database Table usgin asp net C#

 protected void emlSend_Click(object sender, EventArgs e)

{

    byte[] bytes;
    string fileName;

    MailMessage email = new MailMessage();
    SmtpClient SmtpServer = new SmtpClient("attgmail");

    email.From = new MailAddress(txtFrom.Text);
    email.To.Add(txtTo.Text);
    email.Subject = txtSub.Text;
    email.Body = txtMsg.Text;

    //Loop through lstFiles to get all values
    foreach (ListItem item in lstFiles.Items)
    {
        if (item.Selected)
        {
            //Save value to string
            string lstItem = item.Text;
            string lstValue = item.Value;

            //Connect to Server
            string constr = ConfigurationManager.ConnectionStrings["fishbowlConnectionString"].ConnectionString;
            using (SqlConnection con = new SqlConnection(constr))
            {
                using (SqlCommand cmd = new SqlCommand())
                {
                    //Use value in Select statement
                    cmd.CommandText = "SELECT FileName, FileType, Data from CVData where cvID = '" + lstValue + "'";
                    cmd.Connection = con;
                    con.Open();
                    using (SqlDataReader sdr = cmd.ExecuteReader())
                    {
                        //Get CV Data
                        sdr.Read();
                        bytes = (byte[])sdr["Data"];
                        fileName = sdr["FileName"].ToString();

                        //This works if files are stored in folder instead of the below code
                        //Attachment resume = new Attachment(Server.MapPath(VirtualPathUtility.ToAbsolute("~/images/cv/" + fileName)));

                        //Attach Data as Email Attachment
                        MemoryStream pdf = new MemoryStream(bytes);
                        Attachment data = new Attachment(pdf, fileName);
                        email.Attachments.Add(data);
                    }
                    con.Close();
                }
            }
        }
    }

    //send the message
    SmtpClient smtp = new SmtpClient();
    smtp.Send(email);

    lblEmail.Text = "Email was sent Successfully";
}