.NET component to convert DOC, DOCX, PDF, RTF, HTML, XLS, XLSX, PPT using C#, VB.Net. UseOffice .Net is a robust .NET component to convert between DOC, DOCX, XLS, RTF, PPT, PDF and HTML formats with tables, images, fonts, colors etc. Our component is just a class library, it requires Microsoft Office installed. You can install any version of MS Office from: 2000, XP, 2003, 2007, 2010, 2013, 2016 or 2019.