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DataAdapter class forms the base class for all data adapters. ADO.NET implements various
data adapters. These data adapters are inherited from the DbDataAdapter class.
The SqlDataAdapter serves as a link between a DataSet and the SQL Server database for
retrieving and saving data.
The SqlDataAdapter class exists in the System.Data.SqlClient namespace.
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The SqlDataReader class is used to read data from a SQL Server database. It exists in the
For retrieving data from the database:
+ First connect to SQL Server database using SqlConnection.
+ Call the ExecuteReader() method of the SqlCommand class to retrieve records from the
+ Read the records by executing the Read() method.
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DataSet object can either be typed or untyped. A typed DataSet is a class derived from the
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An untyped dataset does not have a built-in schema
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Fetching XML Data Using Datasets
DataSet objects can fetch data from an XML file.
+ ReadXml() method contains the path of the XML file. This method reads the XML data
including the schema of the XML file.
+ Can make changes to the XML data in the DataSet and update
the changes to the XML source file using the WriteXml() method.
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A DataTable class represents a table in the DataSet. It is used to store data from a data
source. It contains a set of rows and columns to organize data in a tabular format.
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The DataTableCollection class is a collection of tables for a DataSet. It enables you to
access the collection of DataTable objects and navigate through the tables in the DataSet.