What is the significance of setting the Nested property of a DataRelation to true?
- It allows for multiple levels of nesting within the dataset
- It automatically updates the parent-child relationship when data changes
- It enables the creation of a nested XML structure when serializing the dataset
- It ensures that the child rows are sorted alphabetically
Setting the Nested property of a DataRelation to true enables the creation of multiple levels of nesting within the dataset. This is useful when dealing with complex hierarchical data structures.
How can you handle exceptions when executing non-query commands in ADO.NET?
- Using arrays
- Using conditional statements
- Using loops
- Using try-catch blocks
Exception handling in ADO.NET involves using try-catch blocks to capture and handle any exceptions that might occur during the execution of non-query commands. This ensures robust error management in database operations.
In LINQ to SQL, the DataContext class represents the ___________.
- Connection to the Database
- Object Model
- Query
- Table in the Database
The DataContext class in LINQ to SQL represents the connection to the database. It manages database connections and transactions and provides methods for querying and submitting changes to the database.
The DataAdapter's Update method is used to ___________ changes made to a dataset back to the database.
- Reflect
- Submit
- Propagate
- Transfer
The correct option is "Propagate". The Update method of DataAdapter propagates changes from the DataSet to the corresponding data source in the database.
In LINQ to Entities, what is the primary purpose of the DbContext class?
- Handles database connection and authentication
- Provides metadata about the database schema
- Represents a collection of database entities
- Represents a session with the database and provides CRUD operations on entities
In LINQ to Entities, the DbContext class serves as a bridge between the domain classes (entities) in the application and the database. It represents a session with the database and provides CRUD (Create, Read, Update, Delete) operations on entities, allowing developers to interact with the database using object-oriented principles.
In Entity Framework, what is the role of the DbContext class?
- Acts as a bridge between the domain/entity classes and the database
- Manages database connections and transactions
- Performs database migrations and updates
- Represents the conceptual model of the data
The DbContext class in Entity Framework acts as a bridge between the domain or entity classes and the database. It provides functionalities for querying, saving, updating, and deleting data from the database using LINQ to Entities. It also manages the database connection and transactions.
You need to execute a stored procedure in ADO.NET that inserts data into a database table. Which ADO.NET object would you use for this task, and how would you pass the necessary parameters?
- SqlCommand
- SqlDataAdapter
- SqlConnection
- SqlDataReader
SqlCommand is the correct option. It represents a Transact-SQL statement or stored procedure to execute against a SQL Server database. Parameters can be passed using the SqlCommand.Parameters collection. SqlDataReader is used for reading a forward-only stream of rows. SqlConnection represents a connection to a SQL Server database. SqlDataAdapter is used to fill a DataSet and update a SQL Server database.
Scenario: Your application needs to display user-generated content in a customizable format. You want to maximize performance while maintaining flexibility in layout design. Which ADO.NET control should you use, and how can you optimize it for performance?
- DataList
- GridView
- ListView
- Repeater
The ListView control in ADO.NET is the recommended choice for displaying user-generated content in a customizable format while maximizing performance. ListView offers flexibility in layout design through customizable templates, allowing you to define the presentation of data according to your requirements. Additionally, ListView provides built-in support for features like sorting, paging, and editing, offering a comprehensive solution for managing user-generated content. To optimize ListView for performance, consider implementing efficient data binding techniques, such as using data caching and optimizing database queries to minimize data retrieval overhead. Furthermore, optimizing the rendering process by reducing unnecessary markup and implementing client-side caching can help improve page load times and overall performance.
Handling data conflicts in ADO.NET involves strategies like ___________ resolution and ___________ resolution.
- Concurrency
- Locking
- Optimistic
- Pessimistic
In ADO.NET, handling data conflicts can be approached using two main strategies: Optimistic concurrency resolution, where the system assumes that conflicts between users are rare, and Pessimistic concurrency resolution, where the system locks data to prevent conflicts.
Parameterized queries help mitigate the risk of ________ attacks.
- Cross-site request forgery
- Cross-site scripting
- Denial-of-Service
- SQL injection
Parameterized queries play a crucial role in mitigating the risk of SQL injection attacks. SQL injection attacks occur when malicious SQL statements are inserted into input fields, potentially allowing attackers to execute unauthorized queries or manipulate data. By using parameterized queries, user input is treated as data rather than executable code, effectively preventing SQL injection by separating SQL logic from user input.