Dataset

Typed DataSet are DataSets which are specialized for a certain database schema.

A Typed DataSet is always derived from the DataSet class, thus a Typed DataSet has all the members and method of an Untyped DataSet. For example: You can access the Tables and Relations properties, and the Rows property for each table.

However, you will be able to access the tables and columns by their names.
For example:
DataRow dr = ds.Tables["MyTable"].Rows(5);
MessageBox.Show(dr["Name"]);

instead of:
MessageBox.Show(((MyTableRow)ds.MyTable.Rows(5)).Name);

You get the benefits of the intellisense, and you get Type Safety features.

Using Strongly Typed objects is always a good OOP practice.

The Typed DataSet is auto generated by the .NET IDE (as Srinivasap article described), using an XML schema.

Hope this helps.