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for a new project we use the ajaxToolkit:CascadingDropDown in combination with a webservice. All works perfect. When on this custom control the Save button is pressed. We get the anoying 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.
Anyone know how we can avoid this?
this is rather urgent and probably i'm not the first
you should google this error, there is a lot of information available about it.