Yahoo login integration to get single user informations

using System.Net; using System.Net.Mail;  
string smtpAddress = "smtp.mail.yahoo.com"; 
int portNumber = 587;
 bool enableSSL = true;  
string emailFrom = "[email protected]"; 
string password = "mypass";
string emailTo = "[email protected]"; 
string subject = "Hello"; 
string body = "Hi, am sending mail from apllication...";  
using (MailMessage mail = new MailMessage()) 
{     
  mail.From = new MailAddress(emailFrom);
  mail.To.Add(emailTo);     
  mail.Subject = subject;     
  mail.Body = body;
  mail.IsBodyHtml = true;     
  mail.Attachments.Add(new Attachment("C:\\readonly.txt"));    
  mail.Attachments.Add(new Attachment("C:\\welcome.zip"));     
  using (SmtpClient smtp = new SmtpClient(smtpAddress, portNumber))   
  {
   smtp.Credentials = new NetworkCredential(emailFrom, password);
   smtp.EnableSsl = enableSSL;
   smtp.Send(mail);
  }
 }