Mail.SMTPClient send error

Hi, I am getting a random NullReferenceException - Object reference not set to an instance of an object.
I cannot reproduce it in my test environment and my users only get it occasionally.
The problem is that the Stack Trace does not point to a line within our code and the entire method is wrapped up in a try catch but the exception is never caught...!
I have narrowed it down to the smtpclient.send(object) method but have no idea how to diagnose the problem further.
Anyone else had this got a solution or any idea as to how I can find out where the problem is?
NB a user can try exactly the same operation using the same parameters and it usually works, it is about 1 in 20 that it fails.
The fact that I am unable to trap it makes it impossible for me to see what the problem is and as this is the code behind in an aspx web page it leaves the users with a nasty screen in front of them...
Heyelp?

Hello WldgDevelopment,
>>The problem is that the Stack Trace does not point to a line within our code and the entire method is wrapped up in a try catch but the exception is never caught...!
If in your project, you use the Exception class to handle all exception, I suggest that you could have a try to use the
NullReferenceException in the try-catch-finally block:
https://msdn.microsoft.com/en-us/library/dszsf989(v=vs.80).aspx.
>>I have narrowed it down to the smtpclient.send(object) method but have no idea how to diagnose the problem further.
Since you have located the caused method and it is a .NET method, I suggest you could check this blog:
http://blogs.msdn.com/b/dotnet/archive/2014/02/24/a-new-look-for-net-reference-source.aspx, you could debug .NET source code according to it. And since the .NET is opensource, you could try to create a yourself
smtpclient.send(object) method and add some custom debug approaches to check which item causes this exception.
Regards,
Fred.
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Message was edited by:
muthu2007
Message was edited by:
muthu2007

props.put("mail.smtp.host", SMTP_HOST_NAME);
props.put("mail.smtp.host", "true");Remove the second line...
Christian

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