Layout.cshtml
<head>
……
<environment names="Development">
<link rel="stylesheet" rel='nofollow' href="~/lib/bootstrap/dist/css/bootstrap.css" />
<link rel="stylesheet" rel='nofollow' href="~/css/site.css" />
<link rel='nofollow' href="~/lib/syncfusion-javascript/Content/ej/web/bootstrap-theme/ej.web.all.min.css" rel="stylesheet" />
<link rel='nofollow' href="~/lib/syncfusion-javascript/Content/ej/web/responsive-css/ej.responsive.css" rel="stylesheet" />
</environment>
<environment names="Staging,Production">
<link rel="stylesheet" rel='nofollow' href="https://ajax.aspnetcdn.com/ajax/bootstrap/3.3.6/css/bootstrap.min.css"
asp-fallback-rel='nofollow' href="~/lib/bootstrap/dist/css/bootstrap.min.css"
asp-fallback-test-class="sr-only" asp-fallback-test-property="position" asp-fallback-test-value="absolute" />
<link rel="stylesheet" rel='nofollow' href="~/css/site.min.css" asp-append-version="true" />
<link rel='nofollow' href="~/lib/syncfusion-javascript/Content/ej/web/bootstrap-theme/ej.web.all.min.css" rel="stylesheet" /> // Need to add these theme reference in here too
<link rel='nofollow' href="~/lib/syncfusion-javascript/Content/ej/web/responsive-css/ej.responsive.css" rel="stylesheet" />
</environment>
</head>
<body>
<environment names="Development">
<script src="~/lib/jquery/dist/jquery.js"></script>
<script src="~/lib/bootstrap/dist/js/bootstrap.js"></script>
<script src="~/js/site.js" asp-append-version="true"></script>
<script src="~/lib/jsrender/jsrender.min.js"></script>
<script src="~/lib/syncfusion-javascript/Scripts/ej/web/ej.web.all.min.js"></script>
</environment>
<environment names="Staging,Production">
<script src="https://ajax.aspnetcdn.com/ajax/jquery/jquery-2.2.0.min.js"
asp-fallback-src="~/lib/jquery/dist/jquery.min.js"
asp-fallback-test="window.jQuery">
</script>
<script src="https://ajax.aspnetcdn.com/ajax/bootstrap/3.3.6/bootstrap.min.js"
asp-fallback-src="~/lib/bootstrap/dist/js/bootstrap.min.js"
asp-fallback-test="window.jQuery && window.jQuery.fn && window.jQuery.fn.modal">
</script>
<script src="~/js/site.min.js" asp-append-version="true"></script>
<script src="~/lib/jsrender/jsrender.min.js"></script> // Need to add these script reference in here too
<script src="~/lib/syncfusion-javascript/Scripts/ej/web/ej.web.all.min.js"></script>
</environment>
</body>
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