Aspose.PDF for .NET 25.10

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET
private static void ManageLayerVisibility()
{
    // The path to the documents directory
    string dataDir = RunExamples.GetDataDir_AsposePdf_Layers();

    // Create a new PDF document
    using (Aspose.Pdf.Document doc = new Aspose.Pdf.Document())
    {
        // Add a page to the document
        Aspose.Pdf.Page page = doc.Pages.Add();
        page.SetPageSize(500, 500);

        // Load an image from a file stream
        using (Stream stream = new System.IO.FileStream(dataDir + "test.png", System.IO.FileMode.Open))
        {
            // Create a new layer with an ID and a name
            Aspose.Pdf.Layer layer = new Aspose.Pdf.Layer("1", "testlayer");

            // Set the initial visibility state of the layer to hidden
            layer.DefaultState = DefaultState.Hidden;

            // Add the image to the page's resources
            string imageName = page.Resources.Images.Add(stream);

            // Add operators to the layer's contents to display the image
            layer.Contents.Add(new Operators.GSave());
            layer.Contents.Add(new Operators.ConcatenateMatrix(500, 0, 0, 500, 0, 0));
            layer.Contents.Add(new Operators.Do(imageName));
            layer.Contents.Add(new Operators.GRestore());

            // Lock the layer to prevent its visibility from being changed in the PDF viewer
            layer.Lock();

            // Add the layer to the page
            page.Layers.Add(layer);
        }

        // Save the PDF document
        doc.Save(dataDir + "test_locked.pdf");
    }
}