"Back" problem

[Quentin Huo]

Hi:

I have an aspx page in which there is a "save" button for saving something
to the database.

I will get an error message "cannot be displayed......" if I do the
following steps:

1. I click the "save" button to save the data;
2. then I click the "save" button to save the data again;
3. I click the "Back" button of the browser(IE or Netscape or...), and then
I will get the error message!

What caused the problem? And how to fix that?

Thanks

Q.