Starting processing as soon as a form is displayed

Greetings,
I am using Visual C# (.Net 1.1) in Visual Studio 2003.

I have a dialog which is going to be doing some hectic processing inclusing database work.
The dialog is created passing through the list of files to be processed.

I would like this dialog to be created, controls to be populated and then for processing to being automatically.

I have tried quite a few methods of doing this but have been having no luck.

My last idea would be to put a timer on the form with a delay of 500ms.
When the timer fires start the processing.
But this seems like quite a hack.

Please could someone help me.

Thanks in advance,
Robert