Knowing to work with the offline ADO.NET classes such as DataSet and DataTable, is the Alpha and the Omega in ADO.NET before actually start queering real database data. You need to understand that ADO.NET divides it's classes in two major categories. The Connected and the Disconnected classes. The Connected classes are those that lets your retrieve and update data in your data sources. The most important classes of that category are the Connection, DataReader, DataAdapter classes. The Disconnected category classes, are those that lets you access and manipulate offline the data you have retrieved using the Connected classes. When you decide, you can synchronize the changes you made to the Disconnected classes, using the Connected ones again. The most important Disconnected classes are the DataSet, DataTable, DataColumn, DataRow, DataRelation classes. This is the second post of the series in ADO.NET category and I hope you have already read the first one, Introduction to ADO.NET.


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