I am trying to implement the spcascade dropdown for achieving caascading. My cascading is achieved but somehow i get the following error on btn OK Click,
Invalid postback or callback argument. Event validation is enabled using
<pages enableEventValidation="true"/> in configuration or
<%@ Page EnableEventValidation="true" %> in a page. For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them. If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation.
Please help as it is urgent :(