C # code to send mail (vs2005)

Send an email

Using System;
Using System.Data;
Using System.Configuration;
Using System.Collections;
Using System.Web;
Using System.Web.Security;
Using System.Web.UI;
Using System.Web.UI.WebControls;
Using System.Web.UI.WebControls.WebParts;
Using System.Web.UI.HtmlControls;
Using System.Net;
Using System.Net.Mail;
public partial class Sendemail:System.Web.UI.Page
{
protected void Page_Load (object sender, EventArgs e)
{

}
protected void Button1_Click (object sender, EventArgs e)
{

String s_from = TextBox1.Text.Trim (). ToString ();
String s_to = TextBox3.Text.Trim (). ToString ();
String Pwd=textbox2.text. Trim (). ToString ();
String S_body =textbox5.text.trim (). ToString ();
S_body = S_body. Replace ("\ r \ n", "<br/>");
S_body = S_body. Replace ("\ n", "<br/>");
S_body = S_body. Replace ("", "");

int i = S_from. IndexOf ("@");
String username = S_from. Substring (0,i);

        mailaddress from = new MailAddress (s_from);
        mailaddress to = new MailAddress (s_to);
        MailMessage mailobj = new MailMessage (from, to);
        mailobj. Subject = TextBox4.Text.Trim (). ToString ();
        mailobj. BODY = S_body;
        mailobj. Isbodyhtml = true;
        mailobj. bodyencoding = System.Text.Encoding.GetEncoding ("GB2312");
        mailobj. Priority = Mailpriority.high;

if (FileUpload1.PostedFile.ContentLength > 0)
{
Mailobj. Attachments.Add (new Attachment (FileUpload1.PostedFile.FileName));
}

SmtpClient smtp = new SmtpClient ("smtp.163.com");
Smtp. Host = "smtp.163.com";
Smtp. useDefaultCredentials = false;
Smtp. Credentials = new NetworkCredential (USERNAME,PWD);
Smtp. Deliverymethod = Smtpdeliverymethod.network;

try {
Smtp. Send (Mailobj);
Response.Write ("ok!");

}
Catch

{
Response.Write ("sorry!");
}


}
}

Because the mailbox is 163, so set the SMTP address is 163, if you use another mailbox, as long as the address of the SMTP to change it.