ASP.Net - GridView paging and sorting validation issues

In case you are receiving the following error while paging or sorting gridview

A potentially dangerous Request.Form value was detected from the client

in event viewer
Event code: 3003
Event message: A validation error has occurred.  

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add the following javascript function
    <script type="text/javascript">
        function validate(){
            var result = Page_ClientValidate();
            return result;
        }
    </script>

and modify form tag, from
    <form id="form1" runat="server">
to 
    <form id="form1" runat="server" onsubmit="return validate();">