JavaScript - How to fix (remove) syntax error in .Net 4.0 in comments

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recently, after converting some code from older version to .Net 4.0 I noticed the following error











to fix it replace

      <title></title>
    <script type="text/javascript"> <!--
        DoSomething();

        function DoSomething() {
            alert("doing something");
        }
   --></script>
</head>

with

    <title></title>
    <script type="text/javascript"> <!--
        DoSomething();

        function DoSomething() {
            alert("doing something");
        }
 //  --></script>
</head>