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Send Gmail email using C#

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Notes:\r\n\r\n(1) your namespace\'s using section should include the following:\r\nusing System.Net.Mail;\r\n\r\n(2) my example code places the email-sending code in a Button\'s Click() event-handler

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  1. 1.
  2.             private void button1_Click(object sender, EventArgs e) {
  3.    2.
  4.                  DialogResult dr = MessageBox.Show("Send email?", "Get Permission", MessageBoxButtons.YesNo, MessageBoxIcon.Question,
  5.    3.
  6.                      MessageBoxDefaultButton.Button2);
  7.    4.
  8.  
  9.    5.
  10.                  if (dr == DialogResult.Yes) {
  11.    6.
  12.  
  13.    7.
  14.                      SmtpClient smtpClnt = new SmtpClient("smtp.gmail.com", 587);
  15.    8.
  16.  
  17.    9.
  18.                      try {
  19.   10.
  20.  
  21.   11.
  22.                          MailMessage oMail = new MailMessage();
  23.   12.
  24.                          oMail.To.Add(new MailAddress("[email protected]"));
  25.   13.
  26.                          oMail.From = new MailAddress("[email protected]");
  27.   14.
  28.                          oMail.IsBodyHtml = true;
  29.   15.
  30.  
  31.   16.
  32.                          oMail.Body = "your message body goes here";
  33.   17.
  34.                          oMail.Subject = "your subject goes here";
  35.   18.
  36.  
  37.   19.
  38.                          smtpClnt.Timeout = 100000;
  39.   20.
  40.  
  41.   21.
  42.                          smtpClnt.EnableSsl = true;
  43.   22.
  44.                          System.Net.NetworkCredential nc = new System.Net.NetworkCredential("[email protected]", "your_password");
  45.   23.
  46.                          smtpClnt.Credentials = nc;
  47.   24.
  48.  
  49.   25.
  50.                          Attachment oAttached = new Attachment("C:\\yourimage.jpg");
  51.   26.
  52.                          oMail.Attachments.Add(oAttached);
  53.   27.
  54.  
  55.   28.
  56.                          smtpClnt.SendCompleted += new SendCompletedEventHandler(MailDeliveryComplete);
  57.   29.
  58.  
  59.   30.
  60.                          smtpClnt.SendAsync(oMail, "sending");
  61.   31.
  62.  
  63.   32.
  64.                      }
  65.   33.
  66.                      catch (Exception mailExc) {
  67.   34.
  68.                          if (mailExc.ToString().IndexOf("could not be resolved") >= 0) {
  69.   35.
  70.                              int line = mailExc.ToString().IndexOf("line");
  71.   36.
  72.                              int leng = mailExc.ToString().Length;
  73.   37.
  74.                              string sLin = mailExc.ToString().Substring(line, (leng - line));
  75.   38.
  76.                              string s = "Either the developer's Gmail SMTP was unavailable, or else your computer is not currently ";
  77.   39.
  78.                              s += "connected to the internet.  Error generated at source code " + sLin;
  79.   40.
  80.                              MessageBox.Show(s, "Unable to send character file via email");
  81.   41.
  82.                          }
  83.   42.
  84.                          else {
  85.   43.
  86.                              MessageBox.Show("Error:" + Environment.NewLine + Environment.NewLine +
  87.   44.
  88.                                  mailExc.Message + Environment.NewLine + Environment.NewLine + mailExc.ToString());
  89.   45.
  90.                          }
  91.   46.
  92.                      }
  93.   47.
  94.                      finally {
  95.   48.
  96.  
  97.   49.
  98.                          //don't invoke smtpClnt.Dispose() here; if you do, the mail never sends
  99.   50.
  100.                      }          
  101.   51.
  102.  
  103.   52.
  104.  
  105.   53.
  106.                  }
  107.   54.
  108.              }
  109.   55.
  110.  
  111.   56.
  112.  
  113.   57.
  114.  
  115.   58.
  116.              private void MailDeliveryComplete(object sender, System.ComponentModel.AsyncCompletedEventArgs e) {
  117.   59.
  118.  
  119.   60.
  120.                  string myMessage = e.ToString();
  121.   61.
  122.                  string myCaption = string.Empty;
  123.   62.
  124.  
  125.   63.
  126.                  if (e.Error != null) {
  127.   64.
  128.                      myCaption = "Error sending email";
  129.   65.
  130.                  }
  131.   66.
  132.                  else if (e.Cancelled) {
  133.   67.
  134.                      myCaption = "Sending of email cancelled.";
  135.   68.
  136.                  }
  137.   69.
  138.                  else {
  139.   70.
  140.                      myCaption = "Your email message was sent successfully to the Game Master.";
  141.   71.
  142.                  }
  143.   72.
  144.  
  145.   73.
  146.                  MessageBox.Show(myMessage, myCaption);
  147.   74.
  148.  
  149.   75.
  150.              }

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