Invalid postback or callback argument
Q: I have updatepanel with few textboxes and asp.net button. if i click the button inside updatepanel its working fine after this action i will try to click the button which is placed outside update panel then i getting this error.
"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."
Thanks & regards