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How can I check the radioButtonList within placeholder in asp.net website?

Last Modified: 2015-10-10
Hello there,

 I have created multiple RadioButtonList for user to check, these radobuttonLists are are created dynamically according to the db records, and they are created at Page_load event.

When user clicked save, I want to check if there is any radio lists that is unanswered, I basically go through each controls in the placeholder
foreach (control ctl in Placeholder.controls)
if (ctl.GetType()==typeof(RadioButtonList))
   if (clt.SelectedIndex == -1)
    ---Do something to display error message --

However this code always got error of "Object reference not set to an instance of an object", I already try to recreate all the controls when posted back in Page_Init event, but still not successful.

Appreciate your help.

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