DbConnection

DbConnection is a class in the .NET Framework that serves as the base class for all database connection classes. It is part of the System.Data.Common namespace and provides a common interface for connecting to a database. This class is abstract and cannot be instantiated directly; instead, it is inherited by specific database connection classes such as SqlConnection for SQL Server, OracleConnection for Oracle databases, and others.

The DbConnection class provides a set of properties and methods that are common to all database connections. Key properties include ConnectionString, which specifies the connection parameters, and State, which indicates the current state of the connection (e.g., open, closed, or broken). Methods include Open, which establishes a connection to the database, and Close, which closes the connection.

DbConnection also supports transactions through the BeginTransaction method, which returns a DbTransaction object. This allows for the execution of multiple commands within a single transaction, ensuring data integrity.

Error handling is managed through exceptions. For example, if a connection attempt fails, a DbException is thrown. This class is part of the broader ADO.NET architecture, which is used for data access in .NET applications.