The equivalent of content placeholders in ASP.NET Razor (MVC) are called sections.
<!-- In your _Layout.cshtml: -->
<head>
@RenderSection("Styles", required: false)
</head>
<!-- Then in your content page: -->
@section Styles {
<link href="@Url.Content("~/Content/StandardSize.css")" />
}
<!-- An alternative solution would be to put your styles into ViewBag/ViewData: -->
<!-- In your _Layout.cshtml: -->
<head>
@foreach(string style in ViewBag.Styles ?? new string[0]) {
<link href="@Url.Content(style)" />
}
</head>
<!-- And in your content page: -->
@{
ViewBag.Styles = new[] { "~/Content/StandardSize.css" };
}
<!-- This works because the view page gets executed before the layout. -->