> 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/xamarin/layers-ocgs/add-layer.md).

# Add a new PDF Layer in Xamarin

Learn how to add a PDF layer or OCG (optional content group) to a new document with full sample code for creating, extracting, and rendering PDF layers. Master PDF optimization now! The Apryse Xamarin

To add a PDF layer or OCG (optional content group) to a new document.

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

```csharp
PDFDoc doc = new PDFDoc();
ElementBuilder builder = new ElementBuilder(); // ElementBuilder is used to build new Element objects
ElementWriter writer = new ElementWriter(); // ElementWriter is used to write Elements to the page

// Create a layer
Group image_layer = Group.Create(doc, "Image Layer");
Config cfg = Config.Create(doc, true);
cfg.SetName("Default");

// Add the new OCG to the list of layers that should appear in PDF viewer GUI.
Obj layer_order_array = doc.CreateIndirectArray();
cfg.SetOrder(layer_order_array);
layer_order_array.PushBack(image_layer.GetSDFObj());

// Start a new page
Page page = doc.PageCreate();
writer.Begin(page);	// begin writing to this page

// Add new content to the page and associate it with the layer.
Image img = Image.Create(doc.GetSDFDoc(), imagename);
img.GetSDFObj().Put("OC", image_layer.GetSDFObj());
writer.WritePlacedElement(builder.CreateImage(img, 300, 600, 200, -150));
writer.End();    // save changes to the current page
doc.PagePushBack(page);
```

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

[PDF layers (OCG)](/xamarin/get-started/samples.md#pdflayers) Full sample code which demonstrates how to create, extract, render PDF layers.


---

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