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See more: ASP.NET Javascript
I tried below code in master page but it shows me error.Like
The Controls collection cannot be modified because the control contains code blocks (i.e. <% ... %>).
My code is here:
<script type="text/javascript" language="javascript">
        var sessionTimeout = "<%= Session.Timeout %>";
        function DisplaySessionTimeout() {
            //if session is not less than 0
            if (sessionTimeout >= 0)
            //call the function again after 1 minute delay
                window.setTimeout("DisplaySessionTimeout()", 5000);
            else {
                //show message box
                alert("Your current Session is over.");
Posted 31-Jan-13 23:32pm
Irbaz Haider Hashmi at 1-Feb-13 5:19am
You can set the variable value from your page code
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Solution 2

if your javascript is in the head section of the page, try placing it at the end after body tag...

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