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http://stackoverflow.com/questions/5203150/openxml-spreadsheat-save-as

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https://docs.microsoft.com/en-us/aspnet/mvc/overview/older-versions/getting-started-with-ef-5-using-mvc-4/implementing-the-repository-and-unit-of-work-patterns-in-an-asp-net-mvc-application#implement-a-generic-repository-and-a-unit-of-work-class

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https://www.codeproject.com/Tips/344604/Export-to-EXCEL-from-Datatable-in-Csharp-Net http://www.neerajcodesolutions.com/2014/04/export-datatable-to-excel-in-aspnet-c.html

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