sending emails using gmail account

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C#

ASP.NET

C#4.0

Hi guys i got this code below to send email using my gmail account and i get this error all the time "Fail sending email"

MailMessage mail = new MailMessage();
SmtpClient smtp = new SmtpClient();

smtp.Host = "smtp.gmail.com";
smtp.Port = 587;
smtp.DeliveryMethod = SmtpDeliveryMethod.Network;
smtp.UseDefaultCredentials = true;
smtp.Credentials = new NetworkCredential("Ngqandu.Anele@gmail.com", "thisMyPassword");

MailAddress emailSender = new MailAddress("Ngqandu.Anele@gmail.com", "BOOM");
mail.From = emailSender;
MailAddress receipient = new MailAddress(txtTo.Text);
mail.To.Add(receipient);
mail.Body = txtBody.InnerText.ToString();
mail.Subject = txtSubject.Text;
smtp.Send(mail);


I tried lots of ather codes in the web, Do i need settings in my web.config file?