单击列表框中的项目时获取项目的完整路径

Question

在ListBox中添加目录，当用户点击项目时，获取项目的完整路径，有人修改代码！

BindingSource listboxsource = null;
public Form1()
{
    InitializeComponent();
    listboxsource = new BindingSource(Properties.Settings.Default.listboxitems, "");
    someListbox.DataSource = listboxsource;

}

//Add Folder in Listbox
private void button57_Click(object sender, EventArgs e)
{

    FolderBrowserDialog dialog = new FolderBrowserDialog();

    dialog.Description = "Please Select Folder";

    if (dialog.ShowDialog() == DialogResult.OK)
    {

        string folderName = dialog.SelectedPath;

        string s = Path.GetFileName(folderName);
        listboxsource.Add(s);

        Properties.Settings.Default.Save();
        listboxsource = new BindingSource(Properties.Settings.Default.listboxitems, "");
        someListbox.DataSource = listboxsource;    
    }
}