1. Session 8
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Data Classes

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Module Introduction

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"DataAdapter" Class
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.
"SqlDataAdapter" 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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"SqlDataReader" Class
The SqlDataReader class is used to read data from a SQL Server database. It exists in the
System.Data.SqlClient namespace.
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
database.
+ Read the records by executing the Read() method.

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DataSet

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Typed Datasets
DataSet object can either be typed or untyped. A typed DataSet is a class derived from the
DataSet class.

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UnTyped Datasets
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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Navigating Records

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"DataTable" Class
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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"DataTableCollection" Class
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.

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Setting Relation between Tables

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"DataColumn" Class
The DataColumn class represents a column in a DataTable.

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"DataRow" Class
The DataRow class represents a row in a DataTable.

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"DataTableReader" Class