Timeouts For Process That Can Take Hours
Nov 22, 2011
I have a web service that sends up to 5000 emails to our customers.
It is called asynchronously from a web application and then chuggs away sending the emails. Generally it works okay. Yesterday, it kept stopping - sometimes after sending a small number (33 first time) and then it might send another couple of hundred - then 50 or so etc. This went on all day as I kept manually calling the web service.
The data (subject, body, fromaddress, replytoaddress etc) is all kept in the database - as are the recipients.
Here's the code that gets the data from the database.
// Create Instance of Connection and Command Object
SqlConnection myConnection = new SqlConnection(ConnectionString);
SqlCommand myCommand = new SqlCommand("CPEmailsToSend_List", myConnection);
// Mark the Command as a SPROC
myCommand.CommandType = CommandType.StoredProcedure;
myCommand.CommandTimeout = 1000;
[Code]....
So I have a dataset containing 3 sets of data - the subject, body etc., a list of attachments and a list of recipients. I then use the .net smtpClient like this:
Code:
//about to start sending emails - update the MessageSendStatus to inprogress
myCommand.CommandText = "CPEmailSendStatus_Update";
myCommand.Parameters.Clear();
myCommand.Parameters.Add("@CPEmailID", SqlDbType.Int).Value = CPEmailID;
myCommand.Parameters.Add("@SendStatus", SqlDbType.TinyInt).Value = 1;
[Code] ....
When the web service stopped (it kept stopping yesterday) - no errors were raised. I have a function on the page that checks the email address is valid before I try to send the email as I know the smtpClient does not like invalid email addresses. Normally, invalid email addresses are trapped and the loop continues and sends the next one etc. But, yesterday, it just stopped sending. No error messages - nothing.
So, I began to wonder if the Command object is timing out. With a lot of email addresses to send to (up to 5000) and half a dozen attachments - the web service can take a long time (hours) to send all the emails. So, is the fact that I am reusing the command object over and over again for different stored procedures the issue? (I do this a lot and have never had a problem before - I read somewhere that the CommandTimeout only counts the time network access is used).
I've been sending test emails all morning (but I can only send small batches as I have a limited number of email addresses I can send test emails to) and they have all worked okay ... but, yesterday, trying to send about 5000 emails took about 30 attempts.
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