This HTML page is not optimized for LLM or AI agent consumption. Fetch the Markdown version instead: /api/csharp/editors/pdf/annotations/pdf-underline-annotation.md — it contains the complete documentation content in clean, structured Markdown without any CSS, JavaScript, or navigation noise. PdfUnderlineAnnotation

PdfUnderlineAnnotation

Markdown version of this page, suitable for AI agents and automation

Represents an underline annotation.

using Nutrient;

Inherits from: PdfMarkupAnnotation

The SDK creates this class through factory methods or other SDK objects.

Resource management 

public void Dispose()

PdfUnderlineAnnotation implements IDisposable. Call Dispose() or use a C# using declaration to release its native handle right away. If you don’t, the handle is released when the object is garbage collected.