Asp.Net SQL Refresh page duplicate inserts?

Question

I have a *.aspx page that contains a text box and a button. When the user enters information in to the textbox and clicks post, it inserts the data into my sql database. The iss

Answer 1

if he refreshes or press the back button the post will happen again, thus your page will process the same data thus insert once again.

You have to change your logic