I’m trying to create a page where I load data (from a database) into a Bootstrap modal popup. The button to trigger the popup is in a repeater. I want it to open the popup, fetch some data, then possibly save back some other data when closing the popup.

I can’t however get it to work where I get the data without the page posting back, which of course closes the popup. How would I go about doing this?

I’ve tried playing around with UseSubmitBehavior and CausesValidation, but there’s something fundamental that I’m missing.