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A typed DataSet allows Intellisense to kick in for both your table names and your column names, which you don't get with just a regular DataSet.
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You know, I don't think I have ever seen such a clear and concise statement that both makes the case for typed data sets and illustrates the difference between the two types of datasets. Maybe I have been inundated with so much info, I have missed seeing it worded this way.

Unless one had to add tables/columns on the fly, I don't know why somebody would not want the data sets to be typed. I have not checked this, but are you precluded from dynamic changes with typed data sets?

There was a long, elaborate, and quite frankley overly-complicated in Visual Studio Magazine that discussed typed data sets, but never got to the core of the issue like you did here.

Thanks!