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.Net programming Interviews Questions


ADO.NET question and answers

Q.1.What is ADO.NET?

ADO.NET is a data access technology in the .NET Framework that provides a set of classes for interacting with data sources, such as databases, in a disconnected manner.

Q.2 What are the primary components of ADO.NET?

The primary components are Connection, Command, DataReader, DataAdapter, and DataSet.

Q.3 What is the role of the Connection object in ADO.NET?

The Connection object is used to establish and manage a connection to a data source, such as SQL Server or Oracle.


Q.4 describe the purpose of the Command object in ADO.NET

The Command object is used to execute SQL queries and commands against a data source, including SELECT, INSERT, UPDATE, and DELETE operations

Q.5 What is a DataReader in ADO.NET

DataReader is a forward-only, read-only cursor used to efficiently retrieve data from a data source in a fast and lightweight manner


Q.6

Explain the difference between DataSet and DataTable in ADO.NET.

Answer: DataSet is an in-memory representation of data that can contain multiple DataTable objects, while DataTable represents a single table of in-memory data.

Q.7 What is the purpose of the DataAdapter class in ADO.NET?

Answer: The DataAdapter class acts as a bridge between a DataSet and a data source, facilitating the retrieval and updating of data.

What is connection pooling in ADO.NET?

Answer: Connection pooling is a technique used to manage database connections efficiently by reusing active connections instead of creating new ones for each request, improving performance

Q.9 How does ADO.NET handle transactions?

Answer: ADO.NET handles transactions using the SqlTransaction class, allowing multiple operations to be executed as a single unit of work, with methods like BeginTransaction, Commit, and Rollback.

Q.10 What are the advantages of using ADO.NET in a .NET application?

The advantages include efficient data management, support for disconnected data architecture, strong type safety, integration with XML, and robust transaction management.




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