Suppose you have some page-level logic, like registering javascript blocks. You want to register all the javascripts with the Page and then render them all at the bottom of the page. Is it possible to access Page from ViewUserControl that is rendered using Html.RenderPartial?

dkl:

Is it possible to access Page from ViewUserControl that is rendered using Html.RenderPartial?

No, they are completely separate.

One way to do it is to use HttpContext.Items

public static void RegisterScript( this HtmlHelper helper, string scriptUrl ) {
  var items = helper.ViewContext.HttpContext.Items;
  if( items.ContainsKey("scripts") )
    (items["scripts"] as List<string>).Add( scriptUrl );
  else
    items.Add( "scripts", new List<string>{ scriptUrl } );
}

public static string OutputScripts( this HtmlHelper helper ) {
  var items = helper.ViewContext.HttpContext.Items;
  if( !items.ContainsKey("scripts") )
    return string.Empty;
  var scripts = items["scripts"] as List<string>;
  // generate and return <script> tags
}

So you can call Html.RegisterScript( "~/Content/scripts/abc.js" ) from anywhere, in any view, as long as it's part of the same request.

I would use something other than "scripts" tho, to avoid naming collisions.