Spire.PDF for .NET 3.6
pire.PDF for .NET enables your .NET applications to generate, open, draw, edit, protect, save and convert PDF documents without using Adobe Acrobat. It enables developers to build any WinForm or Web applications in C# and VB.NET to manipulate PDF documents. The featured function: conversion enables developers to convert HTML, Image and TXT files to PDF with high fidelity. Now it newly supports to convert PDF document into word document.
More details, http://www.e-iceblue.com/Introduce/pdf-for-net-introduce.html