Basic of ADO.NET

1. ADO.NET

2. ADO .NET
• Active Data Objects
• Helps to connect database for CRUD
operations
C# / VB.Net etc. Database
DATA

3. Architecture
Database
SQL, MS-
ACCESS,
ORACLE
Connection Command
DB Connection
Object
Helps us to
execute Query/
Stored Proc
Data Reader
Connected Record Set
(Read Only)
(Sorting, Filtering etc.)
Data Adapter
Data Table
Disconnected Record Set
(Read / Write)
Required for CRUD operations.

4. Data Reader
• Connected
• Forward Only
• Read Only
• After closing connection object, we cannot get
data from data-reader object.

5. DataSet
• In-memory representation of data contained
in a database/XML
• We can perform CRUD operations on dataset,
That will update dataset, not the data source

6. DataTables
Data Table
Data Table 1
Data Table 2
Data Table N
Rows
Rows
Rows

7. Add New DB To Project
• Create new file in App_Data folder
• Select Data -> SQL SERVER DATABASE
• Name it as “ADONET”

8. Connection String
• In web.Config / app.Config add connection string element under <Configuration> :
<connectionStrings>
<add name="DefaultConnection" connectionString="Data
Source=(LocalDb)MSSQLLocalDB;AttachDbFilename=C:Rohit_BackupMYADO.NETADO.NETAp
p_DataADONET.mdf;Initial Catalog=ADONET;Integrated Security=True"
providerName="System.Data.SqlClient" />
</connectionStrings>

9. Connection String

10. • ExecuteReader :
– Select Statement
• ExecuteNonQuery :
– Insert
– Update
– Delete
• ExecuteScalar :
– Returns single value (First column & row)