> For the complete documentation index, see [llms.txt](https://docs.apryse.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.apryse.com/uwp/bookmarks/outline.md).

# Navigate PDF outline tree in UWP

Learn how to navigate and manipulate PDF outlines and bookmarks with a full code sample. Understand the structure of outline trees in PDF documents for interactive navigation. The Apryse uwp SDK strea

To navigate an outline tree and print its result.

{% tabs %}
{% tab title="C#" %}
{% code lineNumbers="true" %}

```csharp
void PrintIdent(Bookmark item)
{
  int ident = item.GetIdent() - 1;
  for (int i=0; i < ident; ++i) {
    Console.Write("  ");
  }
}
void PrintOutlineTree(Bookmark item)
{
  for (; item.IsValid(); item=item.GetNext()) {
    PrintIdent(item);
    Console.Write("{0:s}{1:s} ACTION -> ", (item.IsOpen() ? "- " : "+ "), item.GetTitle());
    if (item.HasChildren()) {
      PrintOutlineTree(item.GetFirstChild());
    }
  }
}
PDFDoc doc = new PDFDoc(filename);
Bookmark root = doc.GetFirstBookmark();
PrintOutlineTree(root);
```

{% endcode %}
{% endtab %}
{% endtabs %}

[Read, add, edit PDF outlines and bookmarks](/uwp/get-started/samples.md#bookmarks) Full code sample which illustrates how to read and edit existing outline items and create new bookmarks using the high-level API.

## About outline tree

A PDF document may display a document outline on the screen, allowing the user to navigate interactively from one part of the document to another. The outline consists of a tree-structured hierarchy of Bookmarks (sometimes called outline items), which serve as a "visual table of contents" to display the document's structure to the user.

Each Bookmark has a title that appears on screen, and an Action that specifies what happens when a user clicks on the Bookmark. The typical Action for a user-created Bookmark is to move to another location in the current document — although any Action can be specified.


---

# Agent Instructions
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```
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