Hi, In my page I have a GridView and in two columns the user has the option to send an email by clicking a button (so, I have two buttons: SendEmail1 and SendEmail2). When clicking in one of these buttons, the email is sent correctly. However, if immediately after send an email the user try to send the other one (by clicking the other button), the following error message is fired:
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. I remember I had this same error message before but I don't remember the context. Does anyone know why this message was fired? What is happening? How to fix it? Thanks a lot, Ana
