Export your excel data to .XLS or .XLSX file formats. 

Based on the Infragistics.Excel compiled assembly, Infragistics' implementation of the XLS/XLSX file format runs in partial-trust environments.
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Obtain a high-fidelity rendition of the WebDataGrid or WebHierarchicalDataGrid™ in your own Excel workbooks.
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The exported grid looks the same in the Excel worksheet. 
Export data in one method call. 

Export from any event handler. Grid data can be exported in one call to the Export method.
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Support for writing Excel 2007 Template files (XLTX), Macro-enabled Template files (XLTM) and Excel 97-2003 Template files (XLT).
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Write Excel template files.