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Showing content from https://learn.microsoft.com/en-us/dotnet/framework/data/adonet/connecting-to-a-data-source below:

Connecting to a Data Source - ADO.NET

In ADO.NET, you use a Connection object to connect to a specific data source by supplying necessary authentication information in a connection string. The Connection object you use depends on the type of data source.

Each .NET Framework data provider included with the .NET Framework has a DbConnection object: the .NET Framework Data Provider for OLE DB includes an OleDbConnection object, the .NET Framework Data Provider for SQL Server includes a SqlConnection object, the .NET Framework Data Provider for ODBC includes an OdbcConnection object, and the .NET Framework Data Provider for Oracle includes an OracleConnection object.

Establishing the Connection
Describes how to use a Connection object to establish a connection to a data source.

Connection Events
Describes how to use an InfoMessage event to retrieve informational messages from a data source.

• Connection Strings
• Connection Pooling
• Commands and Parameters
• DataAdapters and DataReaders
• Transactions and Concurrency
• ADO.NET Overview

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