Add New Links to PDF via .NET SDK

	public static async Task AddLink()
	{
	    const string localPdfDocument = @"C:\Samples\sample.pdf";
	    const string storageFileName = "sample.pdf";
	    const string localFolder = @"C:\Samples";
	    const string resultFileName = "output_add_link.pdf";
	    const string storageTempFolder = "YourTempFolder";
	    const int pageNumber = 2;
	    const string newLinkAction = "https://reference.aspose.cloud/pdf/";

	    // Get your AppSid and AppSecret from https://dashboard.aspose.cloud (free registration required). 
	    var pdfApi = new PdfApi(AppSecret, AppSid);

	    using var file = File.OpenRead(localPdfDocument);
	    await pdfApi.UploadFileAsync(Path.Combine(storageTempFolder, storageFileName), file);
	
	    LinkAnnotation newLink = new LinkAnnotation(
	        Links: new List<Link>() { new Link(newLinkAction) },
	        ActionType: LinkActionType.GoToURIAction,
	        Action: newLinkAction,
	        Highlighting: LinkHighlightingMode.Invert,
	        Color: new Color(A: 0xFF, R: 0xAA, G: 0x00, B: 0x00),
	        Rect: new Rectangle(LLX: 238, LLY: 488.622, URX: 305, URY: 498.588)
	    );

	    AsposeResponse response = await pdfApi.PostPageLinkAnnotationsAsync(storageFileName, pageNumber, new List<LinkAnnotation>() { newLink }, folder: storageTempFolder);

	    if (response == null)
	        Console.WriteLine("LinksAdd(): Unexpected error!");
	    else if (response.Code < 200 || response.Code > 299)
	        Console.WriteLine("LinksAdd(): Failed to add link to the document.");
	    else {
	        using Stream downloadStream = await pdfApi.DownloadFileAsync(Path.Combine(storageTempFolder, storageFileName));
	        using FileStream localStream = File.Create(Path.Combine(localFolder, resultFileName));
	        await downloadStream.CopyToAsync(localStream);
	        Console.WriteLine("LinksAdd(): link '{0}' successfully appended to the document '{1}.", newLinkAction, resultFileName);
	    }
	}