To update data in Entity Framework, you typically modify the properties of an ___________.
- DbContext
- Entity Object
- SQL Query
- Stored Procedure
In Entity Framework, you update data by modifying the properties of an Entity Object, which represents a database record. This allows for object-oriented manipulation of data.
Scenario: Your application is experiencing a high volume of database requests. How can you optimize the connection management to handle this load efficiently?
- Connection Pooling
- Increase Connection Timeout
- Disable Connection Pooling
- Increase Max Pool Size
Option 1, "Connection Pooling," is the correct choice. Implementing connection pooling allows your application to reuse existing connections rather than creating new ones for each request. This helps in efficiently managing resources and improving performance, especially in scenarios with a high volume of database requests. By keeping a pool of established connections, the overhead of creating and tearing down connections is minimized, resulting in better scalability and responsiveness of the application.
Scenario: You are developing a Windows Forms application that needs to display and edit data from a database. Which ADO.NET component would you use to store and manage the data in a tabular format?
- SqlConnection
- SqlDataAdapter
- SqlDataReader
- DataTable
DataTable is the correct option. It represents one table of in-memory data. It can be used to store and manage data retrieved from a database or any other data source. SqlConnection is used to establish a connection to a database. SqlDataAdapter is used to populate DataTables with data from the database. SqlDataReader is used to read data from a database in a forward-only, read-only manner.
You need to make changes to the database schema while keeping the existing data intact. Which feature of Entity Framework Code-First should you use?
- Code Migrations
- Data Annotations
- Database Initializer
- Fluent API
Code Migrations is the feature of Entity Framework Code-First that allows you to make changes to the database schema while preserving the existing data. Code Migrations automatically updates the database schema based on changes made to the C# classes, making it easy to evolve the database schema over time without losing data.
LINQ to SQL is specifically designed for working with ___________ data sources.
- File-based
- NoSQL
- Relational
- Web-based
LINQ to SQL is tailored for working with relational databases. It provides an object-relational mapping (ORM) framework to map database objects to .NET objects, enabling seamless interaction with relational data sources.
The SqlCommand.Parameters collection allows you to define and manage ___________ for your parameterized queries.
- data types
- database connections
- query parameters
- stored procedures
The SqlCommand.Parameters collection in ADO.NET allows developers to define and manage query parameters for parameterized SQL queries. This helps prevent SQL injection attacks by separating SQL code from user input data.
Which ADO.NET class is used to execute SQL queries and stored procedures?
- SqlCommand
- SqlConnection
- SqlDataAdapter
- SqlDataReader
The SqlCommand class is used to execute SQL queries and stored procedures in ADO.NET.
How does a DataAdapter facilitate interaction between a database and a DataSet?
- By automatically synchronizing changes between the database and the DataSet
- By creating a direct connection between the DataSet and the database
- By executing SQL queries directly on the DataSet
- By providing methods to fill a DataSet with data from a database and update the database
A DataAdapter in ADO.NET facilitates interaction between a database and a DataSet by providing methods to fill a DataSet with data from a database using the Fill method, and to update the database with changes made in the DataSet using the Update method.
Scenario: In a high-traffic application, you notice that some database connections remain open indefinitely. How can you ensure proper resource management for these connections?
- Implement a mechanism to close connections after a specified idle time
- Increase the timeout setting for database connections
- Manually close connections after each database operation
- Use connection pooling to automatically manage and recycle connections
Implementing a mechanism to close connections after a specified idle time ensures proper resource management by releasing unused connections back to the pool. This prevents connections from remaining open indefinitely, reducing resource contention and improving overall application performance.
Scenario: You are developing a .NET application that needs to connect to a SQL Server database securely. Which attribute in the connection string would you use to achieve this?
- Integrated Security
- Encrypt
- TrustServerCertificate
- Connection Timeout
The correct option is "Encrypt." By setting the Encrypt attribute to true in the connection string, you can ensure that the data exchanged between the .NET application and the SQL Server database is encrypted, enhancing security. This is crucial for protecting sensitive information during transit. Integrating security through encryption helps in safeguarding the confidentiality and integrity of data.