Description
ADO.NET Interview Topics Basic to Advanced, Real-time Scenario-based and Coding based
- Overview and Core Concepts — ADO.NET architecture, providers, connection objects, command objects, and the disconnected vs connected models.
- Connection Management — SqlConnection/OleDbConnection lifecycles, connection strings, pooling, and best practices for opening/closing connections.
- Commands and Parameters — SqlCommand, parameterized queries, stored procedure calls, command types, and preventing SQL injection.
- DataReader and DataSet — forward-only DataReader for high-performance reads; DataSet/DataTable for disconnected, in-memory relational data and relations.
- DataAdapter and DataBinding — DataAdapter role in filling datasets, update commands, and binding ADO.NET objects to UI controls.
- Transactions and Concurrency — local and distributed transactions, SqlTransaction, isolation levels, optimistic vs pessimistic concurrency.
- Asynchronous Programming — async ADO.NET patterns, ExecuteReaderAsync/ExecuteNonQueryAsync, cancellation tokens, and scalability implications.
- Performance and Tuning — query tuning, batching, command preparation, reader vs dataset tradeoffs, connection pooling tuning, and profiling techniques.
- Error Handling and Logging — robust exception handling, retry policies, transient-fault handling, and structured logging for DB operations.
- Security and Compliance — secure connection strings, integrated security, least-privilege accounts, encryption at rest/in transit, and auditing.
- Integration with ORMs and EF — when to use raw ADO.NET vs Entity Framework, performance considerations, and hybrid approaches.
- Advanced Topics for Senior Engineers — custom providers, bulk copy (SqlBulkCopy), streaming large BLOBs, building reusable data-access layers, testing strategies, and architecture reviews.
