send email using Godaddy server by gmail

 Hello ,
 
My site is hosted  in Godaddy server. And i am
using google apps for emailing a/c for that i have changed the 
MX-records and then it is working fine.
Then i finished my web site
http://www.placewellsolutions.com/Default.aspx
it is working fine there .
in the site there is a  contactus link which opens
http://www.placewellsolutions.com/ContactUs.aspx
this page basically should send a mail to a particular email id .
for sending mail I am using gmail a/c . (Here is the full code)
 
public void SendEmail(string From,string GmailEmail, string GmailPassword, string To, string Subject, string Body,      
        FileUpload fileupload)
    {       

        System.Net.Mail.MailMessage mail = new System.Net.Mail. ...