Best place for data-binding

In the last 3 months I was involved in development of ASP.Net websites. All the projects were started when I joined them, so a lot of code was written.
All the data-related modifications were implemented in this manner:

• make the databinding on page_load event


• handle control events (button click, checkbox check, ...) and make the databinding after any change
• 
  

This was confusing, when we have several controls causing events, which was causing to do the same databinding several times.
So a question arised - how to reduce the number of databindings - where to make the dtabinding. And here is my answer: Do all the data-related changes on PreRender stage. This have a lot of good pooints:

• It runs only once per request


• It runs after all control events, which ensures, that no more flow-changes will arise.

This was a good solution these projects and hope it will also help some of you.