Programlama ve Elektronik - C# ile GMail Hesabına Mail Gönderme

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Net;
using System.Net.Mail;

namespace EMail
{
public partial class MailGondermeFormu : Form
{
public MailGondermeFormu()
{
InitializeComponent();
}

static bool mailSent = false;
string[] GonderilenlerDizisi = new string[3];
public void SendMail()
{
System.Net.Mail.MailMessage msg = new System.Net.Mail.MailMessage();
msg.To.Add(txtKime.Text);
msg.From = new MailAddress(txtKimden.Text txtKullaniciAdi.Text System.Text.Encoding.UTF8);
msg.Subject = txtKonu.Text;
msg.SubjectEncoding = System.Text.Encoding.UTF8;
msg.Body = txtMesaj.Text;
msg.BodyEncoding = System.Text.Encoding.UTF8;
msg.IsBodyHtml = false;
msg.Priority = MailPriority.High;
if (txtEkDosya.Text != "")
{
msg.Attachments.Add(new Attachment(txtEkDosya.Text));
}

SmtpClient client = new SmtpClient();
client.Credentials = new System.Net.NetworkCredential(txtKullaniciAdi.Text txtSifre.Text);
client.Port = 587;//or use 587
client.Host = "smtp.gmail.com";
client.EnableSsl = true;
client.SendCompleted += new SendCompletedEventHandler(client_SendCompleted);
object userState = msg;
try
{
client.SendAsync(msg userState);
}
catch (System.Net.Mail.SmtpException ex)
{
MessageBox.Show(ex.Message "Mail Gönderme Hatası");
}
}

void client_SendCompleted(object sender AsyncCompletedEventArgs e)
{
MailMessage mail = (MailMessage)e.UserState;
string subject = mail.Subject;

if (e.Cancelled)
{
string cancelled = string.Format("[{0}] Mail gönderme iptal edildi." subject);
MessageBox.Show(cancelled);
}
if (e.Error != null)
{
string error = String.Format("[{0}] {1}" subject e.Error.ToString());
MessageBox.Show(error);
}
else
{
MessageBox.Show("E-Mail başarıyla gönderildi.");
}
mailSent = true;
}

private void btnEkle_Click(object sender EventArgs e)
{
openFileDialog1.ShowDialog();
if (openFileDialog1.FileName == "")
{
txtEkDosya.Text = "";
}
txtEkDosya.Text = openFileDialog1.FileName;
}

private void btnGonder_Click(object sender EventArgs e)
{
this.SendMail();
}

private void btnTemizle_Click(object sender EventArgs e)
{
for (int i = 0; i < groupBox1.Controls.Count; i++)
{
if (groupBox1.Controls[i] is TextBox)
{
groupBox1.Controls[i].ResetText();
}
}
}
}
}