asp.net C # send mail implementation code

ASP tutorial. NET C # send mail implementation code

MailMessage mailmessage = new MailMessage ();
Mailmessage.to.add (This.txtto.text);
Mailmessage.from = new System.net.mail.mailaddress (this.txtfrom.text);
Mailmessage.subject = This.txttitle.text;
Mailmessage.body = This.txtcontent.text;
Mailmessage.isbodyhtml = true;
mailmessage.bodyencoding = System.Text.Encoding.UTF8;
mailmessage.priority = System.net.mail.mailpriority.normal;

SmtpClient smtpclient = new SmtpClient ();
Smtpclient.credentials = new System.Net.NetworkCredential (mailmessage.from.address, This.txtpassword.text);
Smtpclient.deliverymethod = System.net.mail.smtpdeliverymethod.network;
Smtpclient.host = "smtp." + Mailmessage.from.host;
Smtpclient.port = 25;
Smtpclient.timeout = 3000;
Smtpclient.enablessl = false;
Smtpclient.send (MailMessage);

This.txtto.text sent to whom

This.txtfrom.text from Who?

This.txttitle.text message Headers

This.txtcontent.text message Content

This.txtpassword.text Sender's mailbox password