internal static void CreatePhysicalFolderStructure(ClientContext context)
    {
        //get list of all folders from the zip file
        var allFolders = Globals.FolderStructure.Descendants().Where(n => n.FolderLevel > 1).ToList();

        //get reference to the list
        List list = context.Web.Lists.GetByTitle(Globals.DocLibName);

        CreateFolder(list, "Excel Files");
        CreateFolder(list, "Excel Files/2013");
        CreateFolder(list, "Excel Files/2013/PDF");

        'executes query
        context.ExecuteQuery();
    }
    internal static void CreateFolder(List list, string name)
    {
        var info = new ListItemCreationInformation
        {
            UnderlyingObjectType = FileSystemObjectType.Folder,
            LeafName = name
        };
        var newItem = list.AddItem(info);
        newItem["Title"] = name;
        newItem.Update();
    }

private static IEnumerable<string> GetListFolderStructure(ClientContext context, List list)
    {
        var results = new List<string>();

        //query to recursively loop through all folders
        var qry = new CamlQuery();
        qry.ViewXml = "<View Scope='RecursiveAll'>" +
                          "<Query>" +
                              "<Where>" +
                                    "<Eq>" +
                                         "<FieldRef Name='FSObjType' />" +
                                         "<Value Type='Integer'>1</Value>" +
                                    "</Eq>" +
                             "</Where>" +
                           "</Query>" +
                        "</View>";

        var allItems = list.GetItems(qry);
        context.Load(allItems, n => n.Include(x => x.DisplayName, x => x.Folder));
        context.ExecuteQuery();

        //retrieve default path that we will trim from our URL result
        //e.g. Result we get from query is:     /sites/RobertTest/MainFolder/TestFolder/Word Files
        //but we want to only return:           TestFolder/Word Files
        string sDefaultPath = new Uri(Globals.SiteURL).AbsolutePath + "/" + Globals.DocLibName + "/";

        //add results to our List
        foreach (var item in allItems)
        {
            results.Add(item.Folder.ServerRelativeUrl.Replace(sDefaultPath, ""));
        }

        return results;
    }