Scenario: Your application uses parameterized queries, but you suspect it may still be vulnerable to SQL injection. What steps would you take to assess and improve its security?
- Implement input validation
- Perform code review to identify vulnerabilities
- Update database permissions
- Use a vulnerability scanner
Conducting a thorough code review can help identify any overlooked vulnerabilities in the application's usage of parameterized queries. Implementing input validation can supplement parameterized queries by ensuring that only expected data formats are accepted. While vulnerability scanners can be useful, they might not catch all potential issues. Updating database permissions can help limit the impact of successful attacks but does not directly address the vulnerability.
The IsolationLevel enumeration in ADO.NET provides options such as ReadCommitted and ___________.
- Serializable
- ReadUncommitted
- RepeatableRead
- Snapshot
The IsolationLevel enumeration in ADO.NET provides options such as ReadCommitted, which ensures that a transaction reads only committed data. RepeatableRead ensures that a transaction can reread data it has previously read.
Which ADO.NET class is commonly used to execute non-query commands?
- SqlCommand
- SqlConnection
- SqlDataAdapter
- SqlDataReader
The SqlCommand class in ADO.NET is commonly used to execute non-query commands such as INSERT, UPDATE, and DELETE. It represents a SQL statement or stored procedure to execute against a SQL Server database.
What is two-way data binding, and how does it differ from one-way data binding?
- It allows data to flow only from the UI control to the data source.
- It allows data to flow only from the data source to the UI control.
- It enables synchronization of data between the UI control and data source.
- It involves no synchronization between the UI control and data source.
Two-way data binding facilitates bidirectional communication between the UI control and the data source. Changes made in the UI control are reflected in the data source, and vice versa. In contrast, one-way data binding allows data to flow in only one direction, either from the data source to the UI control or vice versa, but not both simultaneously.
In ADO.NET, how can you establish relationships between multiple DataTables within a single dataset?
- Using DataConnections
- Using DataMappings
- Using DataMappings and DataConnections
- Using DataRelations
In ADO.NET, relationships between multiple DataTables within a single dataset are established using DataRelations. DataRelations represent relationships between DataTables and are defined by specifying parent and child columns. These relationships allow for navigation between related data tables and are essential for maintaining data integrity in a dataset.
ADO.NET provides the SqlConnection ___________ method to explicitly close a database connection.
- Disconnect()
- Close()
- Dispose()
- Release()
In ADO.NET, the SqlConnection class offers the Close() method to explicitly close a database connection. This method ensures that the connection to the database is properly terminated, releasing associated resources. Although there are methods like Dispose() and Disconnect(), they don't directly serve the purpose of closing the connection in the SqlConnection class. Therefore, "Close()" is the correct option.
What is the process of defining how entities in ADO.NET Entity Framework map to database tables called?
- Database Synchronization
- Entity Framework Design
- Entity Mapping
- Object-Relational Mapping (ORM)
Object-Relational Mapping (ORM)
Custom data providers can be developed to support ___________ databases in ADO.NET.
- MongoDB
- NoSQL
- Relational
- SQL
ADO.NET allows developers to create custom data providers to support various databases, including NoSQL databases like MongoDB. Custom providers can extend ADO.NET's functionality to work with different data storage systems.
The Entity Framework ___________ feature allows you to specify how entity classes are mapped to database tables.
- Code-First
- Code-Last
- Code-Only
- Code-Middle
The correct option is "Code-First." Code-First is a feature of Entity Framework that allows developers to define the domain model classes first, and then generate the database schema based on those classes. This approach provides flexibility and control over the database design while working primarily with object-oriented code.
What are some techniques for enhancing the performance of Repeater and DataList controls when dealing with large datasets?
- Enabling ViewState to persist control state across postbacks.
- Implementing paging to retrieve and display a subset of data at a time.
- Setting the DataList control's RepeatLayout property to Table to optimize rendering performance.
- Using nested controls within Repeater and DataList controls to reduce the number of iterations over the dataset.
One technique for improving performance with large datasets is to implement paging, which involves retrieving and displaying a subset of data at a time. This approach reduces the amount of data transferred between the server and client, leading to faster page load times and improved responsiveness. Additionally, using efficient data retrieval methods such as stored procedures or indexed queries can help minimize database load and improve overall performance. Caching frequently accessed data and optimizing data binding operations can also contribute to better performance when working with Repeater and DataList controls.