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Define types of Datasets in ADO.Net?
There are two type of dataset in Ado.net: 
1.Typed DataSet: Typed DataSet is derived from the base DataSet class and then uses information in an XML Schema file (.xsd file) in order to generate a new class. 
Create a typed DataSet without designer - manually
a.Call the command prompt (cmd) at the location of the XSD schema file. 
b.Use the XSD.EXE utility to create the class for the typed DataSet.

2.Untyped DataSet : Untyped DataSet is not defined by a schema, instead, you have to add tables, columns and other elements to it yourself, either by setting properties at design time or by adding them at run time. 
Posted By: Name:Rajesh Kr URL: Define types of Datasets in ADO.Net?