how to read a property of disposed object

Question

Hi there I am new to this forum so hi to every one.
I have a problem with an application I am developing an application.
The application is suppose to call a form.showdialog() method to show the form. Th eform should download a package. But the problem is that when I cancel the download and try to see a property IsDownloadComplete it says the object is disposed. How can I read a property from that form?
thanking in anticipation