Senden von E-Mail an mehrere Empfänger

Question

Ich möchte E-Mail an mehrere Empfänger in C# über Google Mail senden. Dies ist mein Code, aber dieser Code sendet nur E-Mails an eine Adresse. Wie sollte ich es ändern?

private void button1_Click(object sender, EventArgs e) 
{ 
     if (textBox1.Text == "" || richTextBox1.Text == "") 
     { 
      MessageBox.Show("Please fill out the boxes!"); 
      return; 
     } 

     try 
     { 
      MailMessage message = new MailMessage(); 
      SmtpClient smtp = new SmtpClient(); 

      message.From = new MailAddress("tamogatas.dolgozoadatbazis@gmail.com"); 
      message.To.Add(new MailAddress(Form1.cimzett)); 
      message.Subject = textBox1.Text; 
      message.Body = richTextBox1.Text + Environment.NewLine + "This message was sent from " + (Login.loginnev); 

      smtp.Port = 587; 
      smtp.Host = "smtp.gmail.com"; 
      smtp.EnableSsl = true; 
      smtp.UseDefaultCredentials = false; 
      smtp.Credentials = new NetworkCredential("USERNAME@gmail.com", "PASSWORD"); 
      smtp.DeliveryMethod = SmtpDeliveryMethod.Network; 
      smtp.Send(message); 
      MessageBox.Show("The mail was sent successfully!"); 
     } 
     catch (Exception ex) 
     { 
      MessageBox.Show("Error " + ex.Message); 
     } 
} 

Danke für die Antworten!

Answer 1

private void button1_Click(object sender, EventArgs e) 
{ 
     if (textBox1.Text == "" || richTextBox1.Text == "") 
     { 
      MessageBox.Show("Please fill out the boxes!"); 
      return; 
     } 

     try 
     { 
      MailMessage message = new MailMessage(); 
      SmtpClient smtp = new SmtpClient(); 

      message.From = new MailAddress("tamogatas.dolgozoadatbazis@gmail.com"); 
      message.To.Add(new MailAddress(Form1.cimzett)); <---- THIS LINE 
      message.To.Add(new MailAddress("lalala@gmail.com")); 
      message.To.Add(new MailAddress("lalala3@gmail.com")); 
      message.To.Add(new MailAddress("lalala2@gmail.com")); 
      message.Subject = textBox1.Text; 
      message.Body = richTextBox1.Text + Environment.NewLine + "This message was sent from " + (Login.loginnev); 

      smtp.Port = 587; 
      smtp.Host = "smtp.gmail.com"; 
      smtp.EnableSsl = true; 
      smtp.UseDefaultCredentials = false; 
      smtp.Credentials = new NetworkCredential("USERNAME@gmail.com", "PASSWORD"); 
      smtp.DeliveryMethod = SmtpDeliveryMethod.Network; 
      smtp.Send(message); 
      MessageBox.Show("The mail was sent successfully!"); 
     } 
     catch (Exception ex) 
     { 
      MessageBox.Show("Error " + ex.Message); 
     } 
} 

Answer 2

String[] emails={"n1@gmail.com","n2@gmail.com","n3@gmail.com","n4@gmail.com"}; 
foreach(var items as emails) 
{ 

    MailMessage message = new MailMessage(); 
      SmtpClient smtp = new SmtpClient(); 

      message.From = new MailAddress(items); 
      message.To.Add(new MailAddress(Form1.cimzett)); 
      message.Subject = textBox1.Text; 
      message.Body = richTextBox1.Text + Environment.NewLine + "This message was sent from " + (Login.loginnev); 

      smtp.Port = 587; 
      smtp.Host = "smtp.gmail.com"; 
      smtp.EnableSsl = true; 
      smtp.UseDefaultCredentials = false; 
      smtp.Credentials = new NetworkCredential("tamogatas.dolgozoadatbazis@gmail.com", "adminisztrator0"); 
      smtp.DeliveryMethod = SmtpDeliveryMethod.Network; 
      smtp.Send(message); 
      MessageBox.Show("The mail was sent successfully!"); 
} 

Answer 3

Es gibt ein paar Probleme mit Ihrem Code jedoch das primäre Problem zu beheben es aussieht wie du auf richTextBox1.Text setzt die E-Mail zu liefern, was jedoch eine Annahme

ist also, wo Sie tun: message.To.Add(new MailAddress(Form1.cimzett));, vielleicht ändern Form1.cimzett zu richTextBox1.Text?

Zusätzlich können Sie den gesamten Code SmtpClient außerhalb der Button-Logik deklarieren und stattdessen in dieser Klasse deklarieren.