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

Answer 2

Add Response.Redirect(Request.Url.ToString(), false); to your button event and that should solve the problem.

Answer 3

If the PostButton_Click is the server handler for the click event on your button then insert code shold be executed only if the user hits the post button - it should not happen in case of refresh.

I am pretty sure is not enough - to be sure put a breakpoint in your PostButton_Click method, hit F5 to run in debug mode and see if the breakpoint gets hit with a refresh.

If so it means that:

1. you are calling explicitly PostButton_Click from somewhere else (Page_Load?)
2. PostButton_Click was accidentally set as event handler for some other event on the page

A quick way of verifying hypotesis 1 & 2 is to run a search for PostButton_Click and see where you are calling it from or if it set as handler for some other element (maybe your form?) in the markup.

Answer 4

It would be preferable to redirect the client to another page after the insert, however, if you really need the client stay in the same page, you can use a (bool) variable on your page to state if the insert has been done, and skip the insert logic if it has been executed before