How to send email using ASP.NET ?

How to send email from gmail using ASP.NET?
Sending mail from ASP.NET website with help of SMTP

try
{
    MailMessage msg = new MailMessage();
    //Below loop add multiple Recipient mail id example
    for (int i = 0; i <= toId.Length - 1; i++)
    {
       msg.To.Add(toId[i].ToString());
    }           
    MailAddress frmAdd = new MailAddress(frmgmail);
    msg.From = frmAdd;
    //Check user enter CC address or not
    if (ccId != "")
    {
       msg.CC.Add(ccId);
    }
    //Check user enter BCC address or not
    if (bccId != "")
    {
       msg.Bcc.Add(bccId);
    }
    msg.Subject = msgsubject;
    //Check for attachment is there
    if (FileUpload1.HasFile)
    {
       msg.Attachments.Add(new Attachment(FileUpload1.PostedFile.InputStream, FileUpload1.FileName));           
    }
    msg.IsBodyHtml = true;
    msg.Body = mailContent;
    SmtpClient mailClient = new SmtpClient("smtp.gmail.com", 587);
    NetworkCredential NetCrd = new NetworkCredential(frmgmail, frmpwd);
    mailClient.UseDefaultCredentials = false;
    mailClient.Credentials = NetCrd;
    mailClient.EnableSsl = true;
    mailClient.DeliveryMethod = SmtpDeliveryMethod.Network;
    mailClient.Send(msg);
    clear();
    Label1.Text = "Mail Sent Successfully";
}
catch (Exception ex)
{
    Label1.Text = "Unable to send Mail Please try again later";
}         

//use this line for sending mail from yahoo
SmtpClient mailClient = new SmtpClient("smtp.mail.yahoo.com", 25);
//Change Ssl false
mailClient.EnableSsl = false; 
//For more detail download source and execute