xPort Tools for .NET is 100% managed .NET component that provides extremely fast export of the data from ADO.NET DataSet/DataTable/DataView into the native Microsoft Excel, Microsoft Excel XML, CSV or HTML formats without using Excel itself or any additional tools and providers. xPort Tools for .NET provides fast and simple way to transfer your data with the minimum efforts.

.NET Managed Reader for Microsoft Excel is a set of the classes, designed to read Microsoft Excel files from .NET applications. To provide familiar feel and look for the developers and allow future extension of the component, current version of the .NET Managed Reader for Microsoft Excel implemented as a .NET Managed Provider with the read-only capabilities and allows to read the data from the native Microsoft Excel files without using any additional providers or Microsoft Excel. .NET Managed Reader for Microsoft Excel is a 100% .NET managed code and designed to achieve the best performance with the minimal usage of the RAM.

http://xport.mvps.org/