asp.net - How to prevent repeated postbacks from confusing my business layer

Question

I have a web application (ASP.Net 3.5) with a conventional 3 layer design. If the user clicks a button a postback happens, some middle and data layer code runs, and the screen is refreshed. If the user clicks the button multiple times before the first postback is completed my logic gets confused and the app can end up in an invalid state. What are the best ways to prevent this?

I can use javascript to disable the button but this just hides the problem. How do I build my business and data layers to handle this?

Answer 1

The three most popular methods (which are often used in tandem) are:

1. Disable submit buttons once clicked/pressed;
2. Use POST+REDIRECT+GET to avoid back button issues; and
3. Replace history in the browser so you can't go back (but this should be used sparingly and with good reason).