ASP.NET FO PDF Report Server Control
FO PDF is similar to ASP.NET Server Controls, written in C#. It takes DataTable and few other params to generate the XSL FO and renders a DataGrid like PDF Report using NFOP (Apache FOP Port in J#) PDF Formatter. More tags to generate XSL FO will be added.

iTextSharp
iText# (iTextSharp) is a port of the iText open source java library written entirely in C# for the .NET platform. iText# is a library that allows you to generate PDF files on the fly. It is implemented as an assembly.

Report.NET
Report.NET is a powerful library that will help you to generate PDF documents in a simple and flexible manner. The document can be created with data that have been retrieved from any ADO.NET data set. The Report.NET library is available for free under the LGPL license.

SharpPDF
SharpPDF is a C# library that implements different objects for the creation of PDF documents with few steps. It is created for .NET framework 1.1 and it can create 100% compatible PDF (tested with Acrobat Reader, Ghostscript , JAWS PDF Editor and other PDF readers). The most important goal of this library is the simple way of use.