I have a site that's now running 4.9.2. I took the release.config and changed the connections and validation keys. I found that I needed to add some assemblies and controls to the web.config to allow the ListVIew to work. Unfortunately when I do now the listview works, but any click generates a scripts error: "a runtime error has occured DO you wish to debug? Line 44 Object expected."

function initSearch()
{
  var searchIcon = $get('SearchIcon'); <-- this is the error line
  if (dnn.getVar('SearchIconSelected') == 'S')
  {
    searchIcon.style.backgroundImage=dnn.getVar('SearchIconSiteUrl');
  }
  else
  {
    searchIcon.style.backgroundImage=dnn.getVar('SearchIconWebUrl');

Anyone have any guidelines how to get 3.5 features like Listview working in DNN 4.9.2?

 Look at Michael Washington's tutorial on LINQ (One of the thread's pinned in this forum). There's a good description of what needs to change.