Anyone knows how to display OrderByDescending according to the latest media folder updated?

I have the following code in my cshtml file but want to orderBy latest UpdateDate

   if(docFolder.ChildCount > 0){
                    var file = "";
                      var d = umbraco.library.DateDiff(docFolder.CreateDateTime.ToString("s"), Model.UpdateDate.ToString("s"), "m");
                   
foreach (dynamic doc in docFolder.GetChildMedia().OrderByDescending(x=>x.CreateDateTime).Where(y=>y.ContentType.Alias =="File").Take(1))
                    {
 <strong>@doc.Parent.Text</strong>
                            @doc
}