ADO.NET FUNDAMENTALSBEGINNING ASP.NET 3.5 IN C#

WHAT IS ADO.NET

• ADO.NET is the technology that .NET applications use to interact with database.

• Data binding is a powerful and practical feature

• Not easy, must have solid grasp of ADO.NET fundamentals

UNDERSTANDING DATA MANAGEMENT

THE ROLE OF THE DATABASE

• Adding database to VS2013

ADO.NET BASICS

TWO GROUPS OF CLASSES

• Contain and manage data

• DataSet, DataTable, DataRow, and DataRelation

• Generic

• Connect to specific data source

• Connection, Command, and DataReader

• Data providers

DATA NAMESPACES

DATA PROVIDER CLASSES

• Data classes can’t accomplish much

• Data access is needed see table below

DIRECT DATA ACCESS

• The easiest to connect to the database

• Steps1. Create Connection, Command, and DataReader objects.

2. Use the DataReader to retrieve information from the database, and display it in a control on a web form.

3. Close your connection.

4. Send the page to the user. At this point, the information your user sees and the information in the database no longer have any connection, and all the ADO.NET objects have been destroyed.

To add or update information, follow these steps:

5. Create new Connection and Command objects.

6. Execute the Command (with the appropriate SQL statement).

NAMESPACES NEEDED

using System.Data;

using System.Data.SqlClient;

CREATING A CONNECTION

• SQL Server through the OLE DB provider

• Using SqlConnection object from the SQL Server

THE CONNECTION STRING

• Data source – name of the server

• Initial catalog – name of the database

• Integrated security – using Windows user account, SSPI (security support provider interface) or SQL server user id and password

• Connection Timeout – how long your code will wait before generating an error

STORING THE CONNECTION STRING

• Using a constructor

• Store in web.config

• Import it

GRIDVIEW EXAMPLE WITH MDF FILE

Drag GridView

Bind a data source

Download the file from douap.uap.asia

The name to be added in the web.config

Shows the columns of the database table

Test the connection

Adding/modifying the properties

• Adding theme and AutoGenerateEditButton="true"

EXERCISE

• Add insert to the GridView

• Add UpdateCommand

• Add DeleteCommand

PROBLEM SET

• Modify the order menu to use mdf files and add CRUD