[C#] Email Meeting Calendar Reminder with meeting time reminder

Xin chào các bạn, bài viết hôm nay mình tiếp tục chia sẻ các bạn cách gởi email kèm theo lịch nhắc họp (Meeting Calendar Reminder) bằng ngôn ngữ C#, Winform.

[C#] How to Send email with Meeting Calendar Reminder Winform

Giao diện demo ứng dụng:

Khi gởi email, chúng ta tích hợp lịch họp sẵn luôn vào Outlook mail.

FULL CODE:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Net.Mail;
using System.Net;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Xml.Linq;
using System.IO;

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

        private void btnSendEmail_Click(object sender, EventArgs e)
        {
            DateTime start = Convert.ToDateTime(txt_start.Value);
            DateTime end = Convert.ToDateTime(txt_end.Value);
            var userName = "youremail@laptrinhvb.net";
            var passWord = "BanAnhThao";
            var isSuccess = SendEmailMetting(userName, passWord, txtToEmail.Text, "Demo Send Test Email", "Send email with event Metting", "Phòng họp văn phòng công ty", start, end);
            if (isSuccess)
            {
                MessageBox.Show("send mail is success");
            }
            else {
                MessageBox.Show("send mail is fail");
            }
        }

        private static string MeetingRequestString(string from, List<string> toUsers, string subject, string desc, string location, DateTime startTime, DateTime endTime, int? eventID = null, bool isCancel = false)
        {
            StringBuilder str = new StringBuilder();

            str.AppendLine("BEGIN:VCALENDAR");
            str.AppendLine("PRODID:-//Microsoft Corporation//Outlook 12.0 MIMEDIR//EN");
            str.AppendLine("VERSION:2.0");
            str.AppendLine(string.Format("METHOD:{0}", (isCancel ? "CANCEL" : "REQUEST")));
            str.AppendLine("BEGIN:VEVENT");

            str.AppendLine(string.Format("DTSTART:{0:yyyyMMddTHHmmssZ}", startTime.ToUniversalTime()));
            str.AppendLine(string.Format("DTSTAMP:{0:yyyyMMddTHHmmss}", DateTime.Now));
            str.AppendLine(string.Format("DTEND:{0:yyyyMMddTHHmmssZ}", endTime.ToUniversalTime()));
            str.AppendLine(string.Format("LOCATION: {0}", location));
            str.AppendLine(string.Format("UID:{0}", (eventID.HasValue ? "laptrinhvb_" + eventID : Guid.NewGuid().ToString())));
            str.AppendLine(string.Format("DESCRIPTION:{0}", desc.Replace("\n", "<br>")));
            str.AppendLine(string.Format("X-ALT-DESC;FMTTYPE=text/html:{0}", desc.Replace("\n", "<br>")));
            str.AppendLine(string.Format("SUMMARY:{0}", subject));

            str.AppendLine(string.Format("ORGANIZER;CN=\"{0}\":MAILTO:{1}", from, from));
            str.AppendLine(string.Format("ATTENDEE;CN=\"{0}\";RSVP=TRUE:mailto:{1}", string.Join(",", toUsers), string.Join(",", toUsers)));

            str.AppendLine("BEGIN:VALARM");
            str.AppendLine("TRIGGER:-PT20M");
            str.AppendLine("ACTION:DISPLAY");
            str.AppendLine("DESCRIPTION:Reminder");
            str.AppendLine("END:VALARM");
            str.AppendLine("END:VEVENT");
            str.AppendLine("END:VCALENDAR");

            return str.ToString();
        }
        public static bool SendEmailMetting( string fromEmail, string password, string toEmail, string Sub, string body, string location,  DateTime start, DateTime end)
        {

            string CalendarContent = MeetingRequestString(fromEmail, new List<string>() { toEmail }, Sub , body, location,start, end);

            MailMessage mailMessage = new MailMessage();
            mailMessage.From = new MailAddress(fromEmail); 
            mailMessage.Subject = Sub; 
            mailMessage.Body = body; 
            mailMessage.IsBodyHtml = true;
            mailMessage.To.Add(new MailAddress(toEmail)); 

            AlternateView calendarView = AlternateView.CreateAlternateViewFromString(CalendarContent, new System.Net.Mime.ContentType("text/calendar"));
            calendarView.TransferEncoding = System.Net.Mime.TransferEncoding.SevenBit;
            mailMessage.AlternateViews.Add(calendarView);



            try
            {
                var smtp = new System.Net.Mail.SmtpClient();
                {
                    smtp.Host = "smtp.gmail.com";
                    smtp.Port = 587;
                    smtp.EnableSsl = false;
                    smtp.DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network;
                    smtp.Credentials = new NetworkCredential(fromEmail, password);
                    smtp.Timeout = 20000;
                    smtp.Send(mailMessage);
                }
                return true;
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);

            }
            return false;

        }

        private void Form1_Load(object sender, EventArgs e)
        {
            txt_start.Format = DateTimePickerFormat.Custom;
            txt_start.CustomFormat = "dd-MM-yyyy HH:mm";
            txt_end.Format = DateTimePickerFormat.Custom;
            txt_end.CustomFormat = "dd-MM-yyyy HH:mm";
        }
    }
}

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