INCOMPRENSIBLE 'BOUT DELEGATES!

[siwik75]

I suddenly encountered a very strange problem with my code, and i can't figure out the reason.
I'm trying to report an extraction of the significant code that show the structure of my appbr]
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[ from DbPoller.cs ]
public delegate void dlgNotify(DataSet ds, string commandName);

...
abstract public class Poller : IServiceHandler
{
protected System.Timers.Timer inTimer;

#region
#endregion
//
// ================= DELEGATI ===================
//
public dlgNotify Notify;
public dlgCommandWaking CmdStartReport;
}
...
in class DbPoller: Poller
...
if ( base.Notify != null )
{
base.Notify(detail_result, currentCommand.CommandName);
}
...
[ from CtrlForm.cs - which is a Form ]
in costructorbr] DbPoller pollerObject = new DbPoller(5000);
pollerObject.Notify += new dlgNotify(this.notifyByEMail);
...
private void notifyByEMail(DataSet ds, string commandName)
{
....
HERE IT FAILS!!! WHATEVER IS IN.

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First, i have to say that before it worked fine, and after a few adds that apparently didn't affect the delegate situation and global structure something didn't worked anymore.

In few words the form instantiate a DbPoller and add the local method notifyByEMail to the delegate to handle the notification type. In DbPoller class there's the check for delegate initialization (if ( base.Notify != null ) )

the check is true so the delegate is called and the filled dataset is passed over.

HEREAFTER, when it enters the notifyByEmail, i noticed the dataset were populated only in part: the datasetname property was set and the Tables object was not accessible. The program exits with the exception "The Thread has been stop" or "[Object reference not set to an instance of an object." alternatively. I tried also to stop, to run alone the exe, to restart the pc and whatever is possible to an human mind to think.

Let's say i don't use threading... and i did not change any of the code involved with delegates assignment and calling.

What kind of problem may i have to face with? Could you give me any help?

thank you in advance

Simone
Italy