E-mail.. HELP

[blini]

//create the mail message
MailMessage mail = new MailMessage();

//set the addresses
mail.From = new MailAddress("fe**********@gmail.com");
mail.To.Add("fe**********@gmail.com");

//set the content
mail.Subject = "This is an email";
mail.Body = "this is the body content of the email.";

//send the message
SmtpClient smtp = new SmtpClient("smtp.gmail.com");

smtp.EnableSsl = false;

//to authenticate we set the username and password
properites on the SmtpClient
smtp.DeliveryMethod = SmtpDeliveryMethod.Network;
smtp.Credentials = new
NetworkCredential("","","localhost");
smtp.Send(mail);

It´s ok??
why it does not send the email?