RadSpreadProcessing is a library allowing import (to its internal model) of XLSX, CSV and TXT documents and export of the model (to file, stream or string) in XLSX, CSV, TXT and PDF formats. That said, the library is not intended for importing in controls like RadGridView. In fact, there is a UI component in the Silverlight suite that is capable of visualizing the supported formats - the RadSpreadsheet control. I suggest you check the demos for the component: http://demos.telerik.com/silverlight/#Spreadsheet/FirstLook
. Additionally, please refer to the Formats and Conversion section
of the documentation for examples on how to import and export.
Note that although RadSpreadsheet has a grid-like UI, it is rather different than RadGridView. While RadSpreadsheet is designed for creation and manipulation of spreadsheet documents, RadGridView is meant for data-bound scenarios.
I hope this information is useful.
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