Hello Andy,
You can get the Client State of the RadButton from the Request.Form collection through the name of the RadButton's input name property. For example:
ASPX:
C#:
ASCX:
where the highlighted text is the name of the RadButton's input. Note, however, that the ClientState of the RadButton, will only be available if the button itself is clicked. Therefore I can suggest you to use a hidden field where you can store the RadButton's ToggleState, so that it can be obtained later.
Regards,
Danail Vasilev
Telerik
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