Web Forms :: Dynamic Controls Creation / Rendering Based On Postback Values

I had successfully created a functionality where I can dynamically add rows and columns to a asp table by creating/re-creating controls on every page load.

I have 2 buttons - Add rows and Add columns that, basically according to a asp.,net page life cycle, occur in the following order and work perfectly fine.

Page load is fired and controls along with their viewstate are recreated. In Add row button click event - I just create a new table row and add controls to each cell dynamically.

Same thing with Add column, Delete Row and Delete Column button click events.

However, now I added a Dropdown which when its index is changed needs to retrieve values from the database and create controls based on those values and then also bind the Db values.

But it doesn't work correctly since the asp.net page cycle cannot capture the dropdown's selected value in page_load as the page_load fired first and then the selectedindexchanged event is fired later, the controls are not created.

I don't know how to handle this scenario and incorporate it into my existing code.