I'm trying to capture a form closed event, so that I can trigger a refresh of information from a database. I wrote a simple event handler to deal with it, but when I bind the actual event to the event handler, the application crashes on loading with a System.NullReference error, Object reference not set to an instance of an object.

Code:
this.updateaddr.Closed+=new System.EventHandler(this.Refres**tems);

where updateaddr is a child form, and Refres**tems is an event handler in the parent form.

I suspect that this is a problem with a really obvious solution, but I'm new to Windows programming.

I guess you missed the step of initializing your object. Or
there is a problem with the signature of your handler function.
This code is working absolutely fine for me.

Make sure that the handler of the Closed event has this signature

void FormName_Closed(object sender, System.EventArgs e);

Best way to be sure about the signature of event handlers
is to add an event handler for events using wizard (if it is
available), change the name and associations of the handler
and use its body for your purpose.

Do write back if there is any thing else you wanna ask.

Ankur Verma
.Net and C++ Specialist
Wiley Tech Support

You were absolutely right. I hadn't initialised the instance of the form. Thanks for your help.

Alex