C# ADO.NET Connection

The Connection Object plays a pivotal role as an integral component of the ADO.NET Data Provider, facilitating a distinctive and individualized session with the designated Data Source. It acts as a conduit for the physical communication between the C# application and the Data Source.

Connection Object

The primary function of the Connection Object is to establish a connection to the specified Data Source, forging a vital link between the C# application and the underlying Data Source. This connection is established based on the parameters provided within the Connection String, which contains the essential information needed to establish a successful connection.

Once the connection is established, the Connection Object assumes the responsibility of executing SQL Commands. These commands, executed with the aid of the Connection Object, enable the retrieval or manipulation of data within the Data Source. The Connection Object acts as a bridge, facilitating the smooth transmission of SQL Commands and the subsequent handling of data between the C# application and the Data Source.


In C# the type of the Connection is depend on which Data Source system you are working with. The following are the commonly used Connections from the C# applications.

C# SQL Server Connection

C# OLEDB Connection

C# ODBC Connection

It is crucial to ensure that after the required database activities are completed, the Connection Object is closed. This action serves the purpose of releasing the valuable resources held by the Data Source. Properly closing the Connection Object guarantees the efficient management of system resources and helps maintain the overall stability and performance of the application.


The Connection Object within ADO.NET Data Provider establishes and manages the physical communication channel between the C# application and the Data Source. It is responsible for establishing connections, executing SQL Commands, and ensuring the proper release of Data Source resources upon completion of database activities.