How do you use Excel server-side?

Question

A client wants to \"Web-enable\" a spreadsheet calculation -- the user to specify the values of certain cells, then show them the resulting values in other cells.

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Answer 1

Let me be more adamant than others have been: do not use Excel server-side. It is intended to be used as a desktop application, meaning it is not intended to be used from random different threads, possibly multiple threads at a time. You're better off writing your own spreadsheet than trying to use Excel (or any other Office desktop product) form a server.

This is one of the reasons that Excel Services exists. A quick search on MSDN turned up this link: http://blogs.msdn.com/excel/archive/category/11361.aspx. That's a category list, so contains a list of blog posts on the subject. See also Microsoft.Office.Excel.Server.WebServices Namespace.