C# Email Application

hi, i want to make an email application through c# n i have debugging error on

"client.Send(mail);"

n em using this code

"using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Web;

using System.Net.Mail;

namespace ConsoleApplication6

{

class Program

{

static void Main(string[] args)

{

SmtpClient client= new SmtpClient("smtp.gmail.com");

client.UseDefaultCredentials = true;

MailMessage mail = new MailMessage();

client.EnableSsl = true;

client.Credentials = new System.Net.NetworkCredential("tousifshaikh.91@gmail.com", "shaikh91");

mail.To.Add(new MailAddress("tousifshaikh.91@gmail.com"));

mail.From = new MailAddress( "tousifshaikh.91@gmail.com");

mail.Subject = "subject";

mail.Body = "body";

client.Port = 587;

client.Send(mail);

}

}

}

" can any 1 help me plz