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.
In WinForms, which event is often used to trigger data binding updates?
- ControlChanged
- DataBindingComplete
- DataBindingUpdated
- DataSourceUpdated
In WinForms, the DataSourceUpdated event is often used to trigger data binding updates. This event occurs after the data source has been updated with the new value from the control, allowing for additional processing or validation to be performed.
Which ADO.NET class represents a single table of in-memory data?
- DataTable
- SqlCommand
- SqlConnection
- SqlDataAdapter
The DataTable class in ADO.NET represents a single table of in-memory data. It provides methods and properties to manipulate and interact with the data stored in the table, such as adding rows, deleting rows, or performing queries. It is commonly used for data manipulation and caching within applications.
Scenario: You want to optimize a LINQ to Entities query to minimize the number of database round-trips. What technique or method can you use for this purpose?
- Eager Loading
- Lazy Loading
- Explicit Loading
- AsNoTracking
The correct option is 1. Eager Loading is a technique used in LINQ to Entities to optimize queries by retrieving related data along with the main query results in a single database round-trip. It preloads related entities in advance, reducing subsequent database calls and improving performance.
In Entity Framework, you can improve performance by using ___________ for executing raw SQL queries.
- DbSet
- LINQ
- Stored Procedures
- Entity Framework Core
The correct option is "Stored Procedures." Entity Framework allows developers to execute raw SQL queries for performance optimization. Utilizing stored procedures can offer several benefits, including reduced network traffic, precompiled execution plans, and enhanced security through parameterized queries.
What is the significance of the "Connection Lifetime" property in connection string settings?
- It defines the minimum time a connection must remain open before being reused, It controls the encryption level used for securing the connection, It specifies the maximum duration a connection can remain idle in the pool before being discarded, It determines the maximum number of connections allowed in the pool
- It determines the maximum number of connections allowed in the pool, It defines the minimum time a connection must remain open before being reused, It controls the encryption level used for securing the connection, It specifies the maximum duration a connection can remain idle in the pool before being discarded
- It determines the maximum number of connections allowed in the pool, It defines the minimum time a connection must remain open before being reused, It specifies the maximum duration a connection can remain idle in the pool before being discarded, It controls the encryption level used for securing the connection
- It specifies the maximum duration a connection can remain idle in the pool before being discarded, It determines the maximum number of connections allowed in the pool, It defines the minimum time a connection must remain open before being reused, It controls the encryption level used for securing the connection
The "Connection Lifetime" property in connection string settings specifies the maximum duration a connection can remain idle in the pool before being discarded, helping to manage resource usage and prevent stale connections.
Data binding in ADO.NET allows you to connect what to a user interface?
- Database records
- SQL queries
- Stored procedures
- User interface controls
Data binding in ADO.NET enables the connection of user interface controls, such as textboxes, labels, and datagrids, to database records. This linkage allows for automatic synchronization of data between the database and the user interface, simplifying data presentation and manipulation tasks within the application.
What is the primary purpose of a DataTable in ADO.NET?
- Represents a connection to the database
- Represents a query to be executed on the database
- Represents a single table of in-memory data
- Stores a collection of records from a database
A DataTable in ADO.NET represents an in-memory representation of a single table from a database. It allows manipulation of data locally without directly interacting with the database. This can be useful for caching data, performing calculations, or preparing data for display.
Scenario: You are designing a data-driven application, and you need to work with multiple related tables. Which ADO.NET feature will help you manage these relationships effectively?
- DataAdapter
- DataReader
- DataRelation
- DataSet
Detailed A DataRelation in ADO.NET helps in managing relationships between multiple related tables effectively. It allows defining parent-child relationships between DataTables, which facilitates operations like navigation, constraint enforcement, and maintaining data integrity. Utilizing DataRelations enables efficient querying and manipulation of data across related tables.
What does LINQ stand for?
- Language Integrated Query
- Linked Interaction Query
- Local Interconnected Query
- Longitudinal Inequality Query
LINQ stands for Language Integrated Query. It is a Microsoft .NET Framework component that adds native data querying capabilities to .NET languages. It allows developers to query different types of data sources in a uniform way.