I am trying to access view-state in client side but following exception coming :

JAVASCRIPT:
<script language="javascript" type="text/javascript">
var vCode = '<%=ViewState("code")%>';
alert(dateView);
</script>
CODE BEHIND:
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
ViewState("code") = "EE"
End Sub
Anybody suggest me how to do it?
I would suggests to use RegisterHiddenField than mixing server/js codes:
You may try this sample:
On your javascript: