Practical Database Programming With Visual Basi... Official

Always wrap connections in a Using block. This ensures that the connection is properly closed and disposed of, even if an error occurs, preventing "connection leaks" that can crash a server. 2. Executing Commands Safely

Once connected, the application interacts with data using SQL commands (SELECT, INSERT, UPDATE, DELETE). A common pitfall for beginners is string concatenation—building a query like "SELECT * FROM Users WHERE ID = " & userInput . This opens the door to attacks. Practical Database Programming with Visual Basi...

The foundation of any database application is the connection string. Using the System.Data.SqlClient or System.Data.OleDb namespaces, a developer creates a pipe between the VB application and the database (such as SQL Server or MS Access). Always wrap connections in a Using block