Server Error in '/' Application and Invalid postback or callback argument

Problem :Server Error in '/' Application. Invalid postback or callback argument.  Event validation is enabled using <pages enableEventValidation="true"/> in configuration or <%@ Page...

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Client side validation using javascript

<script language="javascript" type="text/javascript">function validate2(){            if (document.getElementById("<%=txtName.ClientID%>").value=="")     ...

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