send email local host and server

using System.Data.SqlClient;

using System.Configuration;

using System.Net.Mail;

using System.Data;

using System.Web.UI.HtmlControls;

public partial class mailtofrom : System.Web.UI.Page

{

    SqlConnection cn;

    SqlCommand cm;

    SqlDataAdapter adp;

    SqlDataReader dr;

    protected void Page_Load(object sender, EventArgs e)

    {

        if (!IsPostBack)

        { }

    }

    protected void send_Click(object sender, EventArgs e)// sever code

    {

         // server code

          MailMessage mail = new MailMessage();//object created

        //Setting From , To and CC

        mail.To.Add(TextBox1.Text);

        mail.From=new MailAddress("email id ");

        mail.Subject="thanks for Registartion";

        mail.Body="I Am FINE";

        mail.IsBodyHtml=true;// it will convert msg format in html

        //smtp object

        SmtpClient smtp= new SmtpClient();

        smtp.Host="smtp.gmail.com";

        smtp.Credentials=new System.Net.NetworkCredential("email","pass");//email id & password

        smtp.EnableSsl=true;// server security licence will true then only mail will send

        smtp.Send(mail);//send function with mail object pass...which will send mail.

            }

    protected void SENDTO_Click(object sender, EventArgs e)// local data

    {

        // Local HOst

        string fromEmail = "email";

        MailMessage mailmessage = new MailMessage(fromEmail, TextBox1.Text, TextBox3.Text, TextBox2.Text);

        SmtpClient smtpclient = new SmtpClient("email",587);

        smtpclient.EnableSsl = true;

        smtpclient.UseDefaultCredentials = false;

        smtpclient.Credentials = new System.Net.NetworkCredential("email", "pass");

        try

        {

            smtpclient.Send(mailmessage);

        }

        catch(Exception ex)

        {

            Response.Write(ex.Message);

        }

    }

}