ทำการ อนุญาตแอปที่มีความปลอดภัยน้อย ใน gmail ก่อน

สร้างโปรเจ็กส์แบบ WindowsForm

เพิ่ม button1

using System;
using System.Net.Mail;
using System.Windows.Forms;

namespace WindowsFormsApp1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            string displayName = "Phaisarn Sutheebanjard";
            string userName = "xxxxx@gmail.com";
            string password = "yyyyy";
            string mailto = "mr.phaisarn@gmail.com";

            using (SmtpClient smtp = new SmtpClient())
            {
                // email
                MailMessage mail = new MailMessage();
                mail.From = new MailAddress(userName, displayName);
                mail.To.Add(mailto);
                mail.Subject = "Greeting";
                mail.Body = string.Format("Hello World!");

                // smtp
                smtp.DeliveryMethod = SmtpDeliveryMethod.Network;
                smtp.UseDefaultCredentials = false;
                smtp.EnableSsl = true;
                smtp.Host = "smtp.gmail.com";
                smtp.Port = 587;
                smtp.Credentials = new System.Net.NetworkCredential(userName, password);
                smtp.Send(mail);
                MessageBox.Show("Mail Sent");
            }
        }
    }
}

Link

• stackoverflow.com