OnCheckedChanged won't fire when turning CheckBox OFF

[Chris Heinrich]

I have inherited the CheckBox control. It used to work just fine. I just
now noticed that when I turn an ON checkbox to OFF, the server does not seem
to recognize that and it doesn't even trigger the OnCheckedChanged event
handler. When I am going from OFF to ON, it works fine. But once the
checkbox is on, I'm stuck. I have absolutely no idea how or when this
started. I'm still on the original .NET framework and I have never made any
changes to it. And I don't know what I could have introduced in my code to
cause such unexpected behavior. Any ideas? Thanks

 

[Chris Heinrich]

I solved my problem. And the solution is worth noting.

In my inherited CheckBox, I had overridden the OnPreRender event handler.
But I neglected to call the base.OnPreRender(e), which seemed to be the
problem.