Scenario: You are building a high-performance application that requires reading a large dataset from a database. How can you efficiently achieve this using a data reader?
- Use DataSet to retrieve the entire dataset at once and then process it in memory, ensuring faster access to data without repeated database calls.
- Use Entity Framework for object-relational mapping, which abstracts the database interactions and provides a more intuitive way to work with data but may introduce overhead in high-performance scenarios.
- Use LINQ to SQL for querying the database, enabling seamless integration of database operations with C# code, but may not be as efficient for large datasets as SqlDataReader.
- Use SqlDataReader with the appropriate SQL query and optimize database interactions by fetching only the necessary columns and rows, minimizing network overhead.
By utilizing SqlDataReader along with optimized SQL queries, you can efficiently retrieve large datasets from the database while minimizing network overhead and memory consumption. Other approaches like using DataSet or Entity Framework may introduce additional overhead or may not be as efficient for high-performance scenarios compared to SqlDataReader.
Which Entity Framework feature allows you to define the structure of your database in code?
- Code-First
- Database-First
- Model-First
- Schema-First
Code-First is an Entity Framework feature that allows developers to define the structure of the database using code, typically through the use of Plain Old CLR Objects (POCO) classes. With Code-First approach, developers define their domain classes first and then generate the database schema from these classes. It offers flexibility and control over the database design and is suitable for scenarios where developers prefer to work primarily with code rather than visual designers.
LINQ to Objects is primarily used for querying data from ___________.
- Arrays
- Collections
- Databases
- XML
LINQ to Objects is used for querying in-memory data structures such as collections, arrays, or XML. It provides a convenient way to query and manipulate data.
The Fill method of a DataAdapter is used to populate a ___________ with data.
- DataCommand
- DataReader
- DataSet
- DataTable
The Fill method of a DataAdapter is employed to populate a DataSet with data retrieved from a data source. It executes a command and fills the DataSet with the result set returned by the command.
What is the purpose of DataRelations in ADO.NET when working with hierarchical data?
- Defining relationships between tables
- Establishing connections between tables
- Modifying data within a dataset
- Organizing data within a single table
DataRelations in ADO.NET serve the purpose of defining relationships between tables in a hierarchical dataset. They enable navigation and manipulation of related data across multiple tables.
The SqlDataAdapter is used to fill a ________ with data from a database.
- DataGrid
- DataReader
- DataSet
- DataTable
The SqlDataAdapter is primarily used to populate a DataSet with data retrieved from a database. It acts as a bridge between the database and the DataSet, allowing data to be fetched and stored in a structured format.
Which ADO.NET control is commonly used for data binding in Windows Forms applications?
- ComboBox
- DataGridView
- ListBox
- TextBox
The DataGridView control is extensively used for data binding in Windows Forms applications. It provides a powerful and flexible way to display and manipulate tabular data, offering features such as sorting, filtering, and editing. With its rich functionality, the DataGridView control simplifies the process of presenting data from a data source to users in a structured format.
Which ADO.NET class or object is commonly used to create parameterized queries?
- SqlCommand
- SqlConnection
- SqlDataAdapter
- SqlDataReader
The SqlCommand class in ADO.NET is commonly used to create parameterized queries. It allows developers to define parameter placeholders in SQL queries and then assign values to these parameters programmatically, helping to prevent SQL injection attacks and improve query performance.
The ObjectContext class is responsible for ___________ with the underlying database.
- Connecting
- Interfacing
- Mapping
- Querying
The ObjectContext class in Entity Framework is responsible for interfacing with the underlying database. It manages connections, tracks changes, and orchestrates queries and updates to the database. It acts as a bridge between the application and the database, providing a set of methods and properties to interact with entity data models and database objects effectively.
The Entity Framework enables developers to work with data using a ___________-first approach.
- Code
- Data
- Database
- Model
The Entity Framework enables developers to work with data using a code-first approach. In this approach, you define your model classes first, and then the database schema is generated based on those classes.