Page.FindControl() returns null when searching for dynamic control

Question

In asp.net web form-I have added group of radio button dynamically in web form and on clicking submit button when i try to the find the radio button button with its id using f

Answer 1

Two reasons.

When you add controls dynamically, you must re-add them when the page posts back (In Page_Init is a good place). See How to persist a dynamic control

The other is that Page.FindControl() only goes one level down, you need to recursively search down the list. See Better way to find control in ASP.NET