private void buttonMoveDocument_Click(object sender, RoutedEventArgs e) { if (ExplorerTree.SelectedItem != null && ((TreeViewItem)ExplorerTree.SelectedItem).Tag.ToString().EndsWith(".txt")) { MoveFileDialog movDia = new MoveFileDialog(); movDia.SelectedItem = (TreeViewItem)ExplorerTree.SelectedItem; movDia.ShowDialog(); controller.MoveFileToFolder(movDia.FromPath, movDia.ToPath); } }