Just for the record, I'm new to asp.net, so be specific.
I have a main page with an Iframe on it. On the IFrame page I have a gridview that is based on an sql query command. On the main page, I have a listbox with dates in it. What I need to happen is when the user selects a date from the listbox, the date value is sent as a parameter to the gridview on the IFrame so that the sql statement for the gridview is now based on the new date. If it would be better to move the Gridview to the main page, i don't have a problem with that as long as all my other controls on the page don't get refreshed.