Populate server side dropdown with folder list from specific library

Question

I have one application page with one dropdownlist which needs to be filled with the folders from one document library

The library has this structure

Folder1

    Folder1.1

   Folder1.2

Folder2

    Folder2.1

       Folder2.1.1

       Folder2.1.2

I would like to fill a dropdown list with the folder list in a hierarchical way if possible. It has to be server side code, not client side code.

I found something might be useful to me but it wont return the results as I want http://ranaictiu-technicalblog.blogspot.com/2010/03/sharepoint-2010-manage.html

Any idea what should I do?

Answer 1

Just get all subfolders recursively and populate a dropdownlist with them

var dropdownList...
var list....
var folder = list.RootFolder;
PopulateDropDownList(folder);
private void PopulateDropDownList(SPFolder folder) {
  dropdownList.Items.Add(new ListItem(folder.Name, folder.UniqueId));
  foreach(var subfolder in folder.SubFolders) {
    PopulateDropDownList(subfolder); //recursively invoke each self
  }
}

I haven't tested this code. I have just written down what I think should work.

Answer 2

I've used the tree view control for something like this.