Saving data using Callback??

Hi everyone,

I am wondering if anyone has tried the following saving values from a
page to a database using CallBack? is this possible?

Basically instead of pressing a button that contacts the server and
refreshes the whole page, i was wondering if it is possible to allow
the user to update certain values within textboxs and dropdownlist, and
then obtain the values entered on a callback.

Thanks in advance.

.

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