sending mail-From address issue

MailMessage mail = new MailMessage();
        mail.IsBodyHtml = true;
        mail.SubjectEncoding = System.Text.Encoding.UTF8;
        mail.BodyEncoding = System.Text.Encoding.UTF8;
        mail.Priority = MailPriority.High;
        string fromaddrs = @"fromadd@gmail.com";
        string to = @"toadd@gmail.com";
        mail.From = new MailAddress(fromaddrs);
         mail.To.Add(to);
        mail.Subject =subject;
        string body = "<table width="527" border="0" cellspacing="1" cellpadding="1">" +
                        "<tr>" +
                            "<td width="20%" height="20">Name: </td>" +
                            "<td width="80%">" + name + "</td>" +
                        "</tr>" +
                        "<tr>" +
                            "<td height="20">EmailId:</td>" +
                            "<td>" + emailid + "</td>" +
                        "</tr>" +
                        "<tr>" +
                            "<td height="20">MobileNo.:</td>" +
                            "<td>" + mobile + "</td>" +
                        "</tr>" +
                          "<tr>" +
                            "<td height="20">Address:</td>" +
                            "<td>" + address + "</td>" +
                        "</tr>" +
"<tr>" +
                            "<td height="20">Message:</td>" +
                            "<td>" + msg + "</td>" +
                        "</tr>" +
                        "</table>";
        mail.Body = body.ToString();
        SmtpClient smtpclt = new SmtpClient();
        smtpclt.Credentials = new System.Net.NetworkCredential(to, "*****");
        smtpclt.Port = 587;
        smtpclt.Host = "smtp.gmail.com";
        smtpclt.EnableSsl = true;
        smtpclt.DeliveryMethod = SmtpDeliveryMethod.Network;
        try
        {
            smtpclt.Send(mail);
            return 1;
        }
        catch (Exception error)
        {
            return -1;
        }