MVC Page URL Relative

<link href="<%= 
        Page.ResolveUrl("~/Content/core/css/smoothness/jquery-ui-1.8.1.custom.css") %>" 
            rel="stylesheet" 
            type="text/css" />  
<link href='<%= 
        Url.Content("~/Plugins/Views/Webilan/Content/Main.css") %>' 
            rel="stylesheet" 
            type="text/css">
<link rel="stylesheet" type="text/css" media="screen" 
        href='<%= VirtualPathUtility.ToAbsolute(
                    string.Format("~/Content/{0}/css/Site.css", 
                    PostSystem.ThemeName )) %>' />