Generate Excel sheet from datatable

I have the datatable with data. Some cells have null values. I want to c开发者_开发技巧reate the excel sheet from this datatable in C# + asp.net . I am using VS 2008.

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OfficeWriter is a third party API product designed for this task:

http://www.officewriter.com

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If you don't care about formatting you can just write it out as a tab-delimited file.