What is the difference between typed and untyped dataset?

With typed datasets you are the one who tells what to do. You specify
exactly what you want, no matter if it is not exactly what you have in the
database.Typed datasets give you nice automatically-generated
classes with properties and method suited exactly for your needs.


With untyped dataset you have to follow the database structure. The database
tells you what to do. The select statements may return much more columns
that you need, or with different names.

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http://www.dotnetspider.com/kb/Article2891.aspx