Comments by Eyakem (Top 4 by date)

try these:
1. Identfiy the host, smtp.Host = "smtp.gmail.com";
2. Set the port number on your smtp client to 587, smtp.Port = 587;
3. gmail is secure so enable ssl, smtp.EnableSsl = true;

And last, please check if you have the login correct (case sensitive)
4. smtp.Credentials = new System.Net.NetworkCredential("youe_email@gmail.com", "your_password");

I would say expose static method through a webservice and access the method using ajax

You can now place any content inside the div that has .main class and your content will always be centred. Make sure to update the width:400px to suit your design.