Textbox not clearing on data add

Hi, I am new to ASP.Net development, trying to develo pa simple access based library system.
I am using panel to place a few textboxes and buttons on it, on page load, i open db conenction and bound textboxes to recordsets to show data (and navigate using first and previous buttons)
On add button I call a function to clear textboxes, so user can input data, then when i try to write the data back in DB it shows me textbox still showing old record from record set, means "textbox.text="" didn't work.
Any help or idea?
Thanks.

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