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From BucketSoft]
Data Comparisons is a .NET 3.5 application built in WPF that allows you to visually compare data between two SQL database tables. New in this release is improved multi-threading, a progress bar, and the ability to cancel a comparison if it's taking too long. Also new is the ability to choose your own columns to key a comparison off of.
The article continues at
http://www.bucketsoft.com/Data_Comparisons/