And since I've shown how to
check Gmail using C# and Gmail's IMAP, the following snippet shows how to
send an email programmatically, through your Gmail account, using C# and Gmail's SMTP. Please note that, although the code doesn't require notification to the user that an email is about to be sent, you should
always notify the end-user of your program, and give him/her the
option of whether or not to send the email. If you don't, their firewall or protective software may scare them when it pops up a message about your program attempting to send email.
Notes:
(1) your namespace's
using section should include the following:
using System.Net.Mail;(2) my example code places the email-sending code in a Button's Click() event-handler
private void button1_Click(object sender, EventArgs e) {
DialogResult dr = MessageBox.Show("Send email?", "Get Permission", MessageBoxButtons.YesNo, MessageBoxIcon.Question,
MessageBoxDefaultButton.Button2);
if (dr == DialogResult.Yes) {
SmtpClient smtpClnt
= new SmtpClient
("smtp.gmail.com",
587);
try {
MailMessage oMail
= new MailMessage
(); oMail.IsBodyHtml = true;
oMail.Body = "your message body goes here";
oMail.Subject = "your subject goes here";
smtpClnt.Timeout = 100000;
smtpClnt.EnableSsl = true;
System.Net.NetworkCredential nc
= new System.Net.NetworkCredential("[email protected]",
"your_password"); smtpClnt.Credentials = nc;
Attachment oAttached
= new Attachment
("C:\\yourimage.jpg"); oMail.Attachments.Add(oAttached);
smtpClnt
.SendCompleted += new SendCompletedEventHandler
(MailDeliveryComplete
);
smtpClnt.SendAsync(oMail, "sending");
}
catch (Exception mailExc) {
if (mailExc.ToString().IndexOf("could not be resolved") >= 0) {
int line = mailExc.ToString().IndexOf("line");
int leng = mailExc.ToString().Length;
string sLin = mailExc.ToString().Substring(line, (leng - line));
string s = "Either the developer's Gmail SMTP was unavailable, or else your computer is not currently ";
s += "connected to the internet. Error generated at source code " + sLin;
MessageBox.Show(s, "Unable to send character file via email");
}
else {
MessageBox.Show("Error:" + Environment.NewLine + Environment.NewLine +
mailExc.Message + Environment.NewLine + Environment.NewLine + mailExc.ToString());
}
}
finally {
//don't invoke smtpClnt.Dispose() here; if you do, the mail never sends
}
}
}
private void MailDeliveryComplete(object sender, System.ComponentModel.AsyncCompletedEventArgs e) {
string myMessage = e.ToString();
string myCaption = string.Empty;
if (e.Error != null) {
myCaption = "Error sending email";
}
else if (e.Cancelled) {
myCaption = "Sending of email cancelled.";
}
else {
myCaption = "Your email message was sent successfully to the Game Master.";
}
MessageBox.Show(myMessage, myCaption);
}
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That's about what I suspected. Since I'm a one-man software-team, and since the current app I'm working on is liable to be used only by a very limited number of people, I won't worry too much. Been working on it since August, and it's grown (in total, counting all modules) to over 4,000 lines of code. I've gone from 1.0 to 1.3, so far...