public DocumentListPage(string search, string selectedFolderName, string parentName, string updatePath)
        {
            ViewModel = new BaseViewModel {};
            BindingContext = ViewModel;
            _updatePath = updatePath;
			_selectedFolderName = selectedFolderName;
            Title = string.IsNullOrEmpty(parentName) ? "" : parentName;
            _documentListView = new DocumentListView();
            
            _documentListView.ItemTapped += async (sender, e) =>
            {
                try
                {

                    if (CrossConnectivity.Current.IsConnected == false)
                    {
                        await DisplayAlert("Error", "Please check internet connectivity.", "OK");
                        return;
                    }

                    if (_documentListView.AcquireTapLock())
                    {
                        var selectedItem = (Document) e.Item;
                        if (!selectedItem.IsFolder)
                        {
                            int index = selectedItem.Name.LastIndexOf(".");

                            if (index > 0)
                            {
                                var fileExt = selectedItem.Name.Substring(index + 1);
                                if (ImageHelper.SuportedExtension.Contains(fileExt.ToLower()))
                                {
                                    await
                                        Navigation.PushAsync(new ContentPageXaml(selectedItem, _selectedFolderName,
                                            this.Navigation));
                                }
                                else
                                {
                                    await DisplayAlert("Error", "This file type is not suported for preview.", "OK");
                                }
                            }
                            else
                            {
                                await DisplayAlert("Error", "This file type is not suported for preview.", "OK");
                            }
                        }
                        else
                        {
                            string tempSelectedFolderName = selectedItem.Name;
                            string path = selectedItem.RelativePath + "/" + selectedItem.Name;

                            await
                                Navigation.PushAsync(
                                    new DocumentListPage(path, tempSelectedFolderName, _selectedFolderName, path), true);
                        }
                        _documentListView.ReleaseTapLock();
                        ((ListView) sender).SelectedItem = null;
                    }
                }
                catch (Exception ex)
                {
                    DisplayAlert("Error", "An exception occurred.", "OK");
                }
                


            };

            _documentListView.Refreshing += async (sender, e) =>
            {
                try
                {
                    _documentListView.IsRefreshing = true;
                    lstDocuments = await Task.Run(() => GetUpdatedDocuments(search));
                    if (lstDocuments.Count > 0)
                    {
                        _documentListView.ItemsSource = null;
                        _documentListView.ItemsSource = lstDocuments;
                    }
                }
                catch (Exception ex)
                {
                   if (ex.Message.ToUpper().Equals(Constants.INVALID_TOKEN_MSG.ToUpper()))
                   {
                       DisplayAlert("Error","Your session has expired,please relogin.", "OK");
                       Application.Current.MainPage = new LoginPage();
                   }
                   else
                   {
                       DisplayAlert("Error","An exception occurred.", "OK");
                   }
                }
                finally
                {
                    _documentListView.EndRefresh();
                    _documentListView.IsRefreshing = false;
                }
            };
            
            Content = GetDocumentPage(_documentListView, "");
            Device.BeginInvokeOnMainThread(() => BindList(search));


        }
        private StackLayout GetDocumentPage(DocumentListView lsDocumentListView, string labelName)
        {

            _myLabel = new Label
            {
                Text = labelName,
                FontSize = Device.GetNamedSize(NamedSize.Medium, typeof(Label)),
                VerticalOptions = LayoutOptions.Center,
                XAlign = TextAlignment.Center,
                YAlign = TextAlignment.Center,
            };

            var activityIndicator = new ActivityIndicator
            {
                Color = Color.Black
            };
            activityIndicator.SetBinding(ActivityIndicator.IsVisibleProperty, "IsBusy");
            activityIndicator.SetBinding(ActivityIndicator.IsRunningProperty, "IsBusy");

            var stack = new StackLayout()
            {
                Children = {
					_myLabel,
                    activityIndicator,
					lsDocumentListView
				}
            };

            return stack;
        }