I couldnot send email from widnows application using C#?

I want to send email from windows application using C#, i am developing my project on my laptop, i am connected to internet when i try to send email it fails to send here is the code i have.

Code:

---

private void button1_Click(object sender, EventArgs e)
        {
 
            try
            {
                MailMessage mail = new MailMessage();
                mail.To.Add("[email protected]");
                mail.To.Add(txtto.Text.ToString());
                mail.From = new MailAddress("[email protected]");
                mail.Subject = "School Name";
                string Body = txtmsg.Text;
                mail.IsBodyHtml = true;
 
                SmtpClient smtp = new SmtpClient("smtp.gmail.com", 587);
                smtp.Host = "smtp.gmail.com"; //Or Your SMTP Server Address 
                smtp.Credentials = new System.Net.NetworkCredential
                    ("[email protected]", "test12");
                smtp.DeliveryMethod = SmtpDeliveryMethod.Network;
                smtp.EnableSsl = true;
                smtp.Send(mail);
                MessageBox.Show("Mail Send");
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

---

my app.cong

HTML Code:

---

<configuration>
  <system.net>
    <mailSettings>
      <smtp deliveryMethod="network">
        <network defaultCredentials="false" host="smtp.gmail.com" port="587" username="[email protected]" password="test123"/>
      </smtp>
    </mailSettings>
  </system.net>
</configuration

---

i really want to send email from my windows application using C#, please help me

"when i try to send email it fails" -- sigh... you do realize with that statement, what you have done is walk into the doc's office and said "it hurts" ... and expect him to figure it out, right? You wouldn't do that now would you? since you have given no further details, then I can only assume that either your fingers fell off, or you've got eels in your hovercraft... or possibly both...

-tg