Feature overview

Generates Excel files from WinForms, WebForms ASP.NET, PocketPC applications, webservices on the fly and fast with FlexCel Studio for .NET
Native .NET components (no additional OLE/dlls required) allowing to read, create and modify native Excel .XLS and .XLSX files without needing to have Excel installed.
Supported Excel 97 .XLS file format and Excel 2007/2010 .XLSX format
Native PDF file export
Exceptionally fast and solid hand tuned .XLS & .XLSX engine capable of generating thousands files per minute.
Able to modify .XLS files and keep almost everything existing on the original file, from macros to activex objects.
Recalculation of more than 200 Excel functions.
Ability to read and write encrypted .XLS files.
Completely written in C# 100% managed code, with NO interop and NO p/invokes!
Runs on .NET 2.0, .NET 3.0, .NET 3.5, .NET 4.0, Mono and the .NET Compact Framework (xlsx support requires .NET 3.5).
Templates can be stored inside your executable file, in a database or in any place from where you can access it as a stream.
Extensive API is available with which you can programmatically write and read files, with formatting info, images comments, etc.
Export to HTML in HTML 4.01 strict or XTHML 1.1 and fully standards compliant
Report Engine that allows to create complex reports using Excel as your report designer, so your final users can modify them. You can use images/comments/conditional formats/merged cells/pivot tables/charts and almost anything you can think of on those reports.