Sending multiple emails with combobox's content addresses

Question

Hi!

With these codes I can send one email to someone without problem. But I need to learn how to send multiple emails with email's addresses itens into my combobox. Mean into my combobox I have three (3) emails address:

[email protected]

I would like to know how can I send one by one all these three emails once. Then to help user to be sure that its sending. I need a label showing the number and counting the number of emails that its inside of my combobox. Or just showing a barchart counting from 0% until 100% when finish.

Please let see my codes and its works perfectly but only sending one email from a textbox. Now I need your help how sending three item's emails addresses from my combobox oneby one once:

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

SmtpClient client1 = new SmtpClient("smtp.live.com", 25); //smtp.gmail.com // For Gmail
//smtp.live.com // Windows live / Hotmail
//smtp.mail.yahoo.com // Yahoo
//smtp.aim.com // AIM
//my.inbox.com // Inbox

//Authentication.
//This is where the valid email account comes into play. You must have a valid email account(with password) to give our program a place to send the mail from.

NetworkCredential cred = new NetworkCredential("[email protected]", "12345");

//To send an email we must first create a new mailMessage(an email) to send.
MailMessage Msg = new MailMessage();

// Sender e-mail address.
Msg.From = new MailAddress(textBox2.Text);//Nothing But Above Credentials or your credentials (*******@gmail.com)

// Recipient e-mail address.
Msg.To.Add(textBox2.Text);

// Assign the subject of our message.
Msg.Subject = "Accounting Report";

// Create the content(body) of our message.
Msg.Body = txtEmailContent.Text;

/*System.Net.Mail.Attachment attachment;
attachment = new System.Net.Mail.Attachment("c:/Scaner1.jpg");
Msg.Attachments.Add(attachment);*/

// Send our account login details to the client.
client1.Credentials = cred;

//Enabling SSL(Secure Sockets Layer, encyription) is reqiured by most email providers to send mail
client1.EnableSsl = true;

//Confirmation After Click the Button
//label1.Text = "Mail Sended Succesfully";

// Send our email.
client1.Send(Msg);
//}
//catch
//{
// If Mail Doesnt Send Error Mesage Will Be Displayed
//label1.Text = "Error";

Israel · Answer

@Amit Sorry Amit I have been a little bit without my Net for some technical reason. Then let go step by step. I would like to ask you if you can write some code to display combobox's item one by one. For example one second of interval displaying one by one. Thanx

Amit Gupta · Answer

@Israel Its not the correct way to send mail have you seen the attached code file that I send? Msg.Subject = Accounting report ; Msg.Body = txtEmailContent.Text; client1.Credentials = cred; client1.EnableSsl = true ; for ( int i = 0; i { var mailID = comboBox1.Items[i].ToString(); Msg.To.Add(mailID); client1.Send(Msg); //the error message pointed here Msg.To.Clear(); } //client1.Send(Msg); Client1.Send(...) should always be used at the last. Pass all your credentials and stuff before sending the mail.

Israel · Answer

Amit see what I do on a button but I receive this error message: The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.0 Must issue a STARTTLS command first private void Btn_Click( object sender EventArgs e) { SmtpClient client1 = new SmtpClient(smtp.live.com 25); NetworkCredential cred = new NetworkCredential(lunasoft.research@hotmail.com 12345); //To send an email we must first create a new mailMessage(an email) to send. MailMessage Msg = new MailMessage(); Msg.From = new MailAddress(comboBox1.Text);//Nothing But Above Credentials or your credentials (*******@gmail.com) // Recipient e-mail address. ///////////////////////////// for (int i = 0; i { var mailID = comboBox1.Items[i].ToString(); Msg.To.Add(mailID); client1.Send(Msg); //the error message pointed here Msg.To.Clear(); } Msg.Subject = Accounting report; Msg.Body = txtEmailContent.Text; client1.Credentials = cred; client1.EnableSsl = true; client1.Send(Msg);

Tapan Patel · Answer

Of course you can go with the solution suggested by others. Another option is to push these addresses in BCC and keep your address in to list and send it. Seding separate emails could be performance hit. If the question is to measure the performance for number of addresses through bar chart or progressbar then you can do that over the send time to three addresses.

Amit Gupta · Answer

Adding these lines will accomplish your work // Send our email. // Recipient e-mail address. for ( int i = 0; i { var mailID = comboBox1.Items[i].ToString(); Msg.To.Add(mailID); client1.Send(Msg); Msg.To.Clear(); } You can also add multiple user using Msg.To.Add(..) or you can use the above without having to re-initialize the whole object again. Same has been attached.

Israel · Answer

That why I posted these code here. I need a solution Amit .

Amit Gupta · Answer

Why not using for loop for this for sending one by one recipient