async void GetRootFolder (LoginOptions options)
        {
            tableView.Source = null;
            tableView.ReloadData ();

            try {
                var profile = await Services.Dropbox.GetProfileAsync (options: options);
                new UIAlertView ("Profile", profile.ToString (), null, "OK").Show ();
            } catch (UriFormatException) {
                new UIAlertView ("Specify your API keys", "Open Services.cs and specify your API keys for each provider.", null, "OK").Show ();
                return;
            } catch {
                Console.WriteLine ("Failed to retrieve Dropbox profile. (Maybe we're logged out?)");
                return;
            }

            DropboxManager.Metadata metadata;
            try {
                metadata = await Services.Dropbox.GetMetadataAsync ("/", includeContent: true, hash: null, options: options);
            } catch {
                Console.WriteLine ("Failed to retrieve Dropbox metadata");
                return;
            }

            if (tableView.Source == null) {
                var source = new MetadataSource (metadata.Contents) {
                    Controller = new WeakReference (this)
                };
                tableView.Source = source;
            } else {
                ((MetadataSource)tableView.Source).Add (metadata.Contents);
            }

            tableView.ReloadData ();
        }

 public MySqlDbContext(
     string connection,
     BackendConfiguration backendConfiguration,
     MetadataSource metadataSource)
     : base(connection, backendConfiguration, metadataSource)
 {
 }

 public WorkflowDurableInstancingDataContext(string connectionString, BackendConfiguration backend, MetadataSource metadataSource)
     : base(connectionString, backend, metadataSource)
 {
     var schemaHandler = GetSchemaHandler();
     string script = null;
     if (schemaHandler.DatabaseExists())
     {
         script = schemaHandler.CreateUpdateDDLScript(null);
     }
     else
     {
         schemaHandler.CreateDatabase();
         script = schemaHandler.CreateDDLScript();
     }
     if (!String.IsNullOrEmpty(script))
     {
         schemaHandler.ExecuteDDLScript(script);
     }
 }

		public EntitiesModel(string connection, MetadataSource metadataSource)
			:base(connection, backend, metadataSource)
		{ }

		public Northwind(string connection, MetadataSource metadataSource)
			:base(connection, backend, metadataSource)
		{ }

		public SupermarketMySqlContext(string connection, BackendConfiguration backendConfiguration, MetadataSource metadataSource)
			:base(connection, backendConfiguration, metadataSource)
		{ }

		public OpenAccessMySQL(string connection, MetadataSource metadataSource)
			:base(connection, backend, metadataSource)
		{ }

		public OpenAccessMySqlSupermarketEntityModel(string connection, BackendConfiguration backendConfiguration, MetadataSource metadataSource)
			:base(connection, backendConfiguration, metadataSource)
		{ }

		public ClinicsMySQLContext(string connection, BackendConfiguration backendConfiguration, MetadataSource metadataSource)
			:base(connection, backendConfiguration, metadataSource)
		{ }

		public PermissionsModel(string connection, BackendConfiguration backendConfiguration, MetadataSource metadataSource)
			:base(connection, backendConfiguration, metadataSource)
		{ }

		public SupermarketModel(string connection, MetadataSource metadataSource)
			:base(connection, backend, metadataSource)
		{ }

		public TelerikAcademyModels(string connection, MetadataSource metadataSource)
			:base(connection, backend, metadataSource)
		{ }

        public PharmacyMySqlModel(string connection, BackendConfiguration backendConfiguration, MetadataSource metadataSource)
			:base(connection, backendConfiguration, metadataSource)
		{ }

		public SupermarketMySqlEntities(string connection, MetadataSource metadataSource)
			:base(connection, backend, metadataSource)
		{ }

		public ProductsDBModel(string connection, BackendConfiguration backendConfiguration, MetadataSource metadataSource)
			:base(connection, backendConfiguration, metadataSource)
		{ }

		public CatalogEntities(string connection, MetadataSource metadataSource)
			:base(connection, backend, metadataSource)
		{ }

		public TelerikAcademyEntities(string connection, BackendConfiguration backendConfiguration, MetadataSource metadataSource)
			:base(connection, backendConfiguration, metadataSource)
		{ }

		public CorridaModel(string connection, MetadataSource metadataSource)
			:base(connection, backend, metadataSource)
		{ }

		public CentaurFactoryModel(string connection, BackendConfiguration backendConfiguration, MetadataSource metadataSource)
			:base(connection, backendConfiguration, metadataSource)
		{ }

		public ElectronicStoreMySQLFluentModel(string connection, BackendConfiguration backendConfiguration, MetadataSource metadataSource)
			:base(connection, backendConfiguration, metadataSource)
		{ }