I found a great post which summarizes aggregate functions in LINQ. It includes examples for Average, Sum, and Count. Check it out at http://www.dev102.com/2008/04/16/how-to-use-aggregate-functions-with-linq-to-sql/ . As always, you can test your functions
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Read the complete post at http://feeds.feedburner.com/~r/JasonNGaylord/~3/281508100/aggregate-functions-in-linq.aspx