Applications communicate with a database, firstly, to retrieve the data stored there and present it in a user-friendly way, and secondly, to update the database by inserting, modifying and deleting data. Microsoft ActiveX Data Objects.Net (ADO.Net) is a model, a part of the.Net framework that is used by the.Net applications for retrieving, accessing and updating data. ADO.Net Object Model ADO.Net object model is nothing but the structured process flow through various components. The object model can be pictorially described as − The data residing in a data store or database is retrieved through the data provider. Various components of the data provider retrieve data for the application and update data.

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An application accesses data either through a dataset or a data reader. • Datasets store data in a disconnected cache and the application retrieves data from it. • Data readers provide data to the application in a read-only and forward-only mode. Data Provider A data provider is used for connecting to a database, executing commands and retrieving data, storing it in a dataset, reading the retrieved data and updating the database.

The data provider in ADO.Net consists of the following four objects − Sr.No. Objects & Description 1 Connection This component is used to set up a connection with a data source.

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2 Command A command is a SQL statement or a stored procedure used to retrieve, insert, delete or modify data in a data source. 3 DataReader Data reader is used to retrieve data from a data source in a read-only and forward-only mode. 4 DataAdapter This is integral to the working of ADO.Net since data is transferred to and from a database through a data adapter.

It retrieves data from a database into a dataset and updates the database. When changes are made to the dataset, the changes in the database are actually done by the data adapter.

There are following different types of data providers included in ADO.Net • The.Net Framework data provider for SQL Server - provides access to Microsoft SQL Server. • The.Net Framework data provider for OLE DB - provides access to data sources exposed by using OLE DB. • The.Net Framework data provider for ODBC - provides access to data sources exposed by ODBC. • The.Net Framework data provider for Oracle - provides access to Oracle data source.

• The EntityClient provider - enables accessing data through Entity Data Model (EDM) applications. DataSet DataSet is an in-memory representation of data. It is a disconnected, cached set of records that are retrieved from a database. When a connection is established with the database, the data adapter creates a dataset and stores data in it. After the data is retrieved and stored in a dataset, the connection with the database is closed. This is called the 'disconnected architecture'. The dataset works as a virtual database containing tables, rows, and columns.