Validating event radio group

When i give input and no radio button is selected it should alert the user, but its not happening. When i click submit without selecting the radio button it gives me a blank page. I know there might be lot of duplicates, but I've tried them all to no avail.

Can you please paste the error message here so that I can investigate?

If is false, trigger whatever user notifications you need to.

If you really need to use one of the Radio Button's validating event, you could create just one such event and wire all your Radio Buttons to use that one event.

Pls let me know how can i achieve this requirement?

I have a simple form with one text box and a panel with three radio buttons in it. I found that you can't validate on the panel containing the radio buttons, instead I had to write a validation event for each button.

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