The DeleteOnSubmit method is used to mark an entity for ___________.

  • Deletion
  • Updating
  • Insertion
  • Deletion or Removal
The correct option is 'Deletion or Removal'. The DeleteOnSubmit method in LINQ to SQL is used to mark an entity for deletion. It does not immediately delete the entity from the database but rather flags it for deletion. The actual deletion occurs when the SubmitChanges method is called on the DataContext. This method is commonly used to prepare objects for deletion before committing changes to the database.

What are some considerations for optimizing database table mappings in Entity Framework for better performance?

  • Avoid over-fetching data by projecting only required columns in queries.
  • Implement proper indexing on frequently queried columns to improve query performance.
  • Minimize round trips to the database by batching multiple operations into a single transaction.
  • Use eager loading to fetch related entities upfront instead of lazy loading.
When optimizing database table mappings in Entity Framework for better performance, it's essential to avoid over-fetching data by projecting only the required columns in queries. This reduces network overhead and improves query execution time. Additionally, using eager loading instead of lazy loading can help fetch related entities upfront, reducing the number of subsequent database calls. Implementing proper indexing on frequently queried columns enhances query performance by facilitating faster data retrieval. Minimizing round trips to the database by batching multiple operations into a single transaction reduces latency and improves overall throughput. These considerations help optimize the performance of Entity Framework applications by efficiently managing database interactions.

When dealing with Entity Framework performance, it's important to consider the ___________ of database queries generated by the mappings.

  • Execution Plan
  • LINQ Queries
  • Lazy Loading
  • SQL Queries
When dealing with Entity Framework performance, it's important to consider the "SQL Queries" of database queries generated by the mappings. Entity Framework translates LINQ queries into SQL queries to interact with the database. Understanding and optimizing the SQL queries generated by Entity Framework can significantly improve the performance of your application.

The ___________ method in Entity Framework allows you to specify custom logic to resolve concurrency conflicts.

  • ApplyCurrentValues
  • DetectChanges
  • ResolveConflicts
  • SaveChanges
In Entity Framework, the ApplyCurrentValues method allows you to specify custom logic to resolve concurrency conflicts. This method is typically used when you need to apply changes from a detached entity to the context.

Scenario: You are working with a dataset containing customer orders and order details in a hierarchical structure. How would you use DataRelations to retrieve order details for a specific customer's orders?

  • Set the Nested property to true
  • Set the RelationName property to "OrderDetails"
  • Use the GetChildRows method
  • Use the GetParentRow method
To retrieve order details for a specific customer's orders using DataRelations, you would use the GetChildRows method to obtain the child rows related to the customer's orders. This method allows accessing the related child rows based on the specified parent row. The GetParentRow method is used to retrieve the parent row from a child row. Setting the Nested property to true enables navigating through hierarchical data. Setting the RelationName property to "OrderDetails" specifies the relation to use for retrieving order details. This approach leverages the hierarchical structure defined by DataRelations to efficiently access related data.

You are designing a multi-tier application where data needs to be transferred between the presentation layer and the database. Which ADO.NET component plays a crucial role in managing data synchronization in this architecture?

  • DataSet
  • SqlCommand
  • SqlConnection
  • SqlDataAdapter
The DataSet plays a crucial role in managing data synchronization in a multi-tier application architecture. It acts as an in-memory cache of data retrieved from the database and provides a disconnected data model, allowing data to be transferred between the presentation layer and the database in a flexible and efficient manner.

Your team is debating whether to use Code-First or Database-First in Entity Framework for an upcoming project. What factors should you consider when making this decision?

  • Development Speed, Code Control
  • Existing Database Structure, Visual Modeling
  • Performance Optimization, Code Reusability
  • Project Complexity, Team Skillset
When deciding between Code-First and Database-First in Entity Framework, factors such as the existing database structure and the availability of visual modeling tools should be considered. Database-First is suitable when working with an existing database schema or when visual modeling is preferred. On the other hand, Code-First provides more control over the code and development process, making it suitable for projects where development speed and code control are essential.

How do you pass parameters to a stored procedure in ADO.NET?

  • By embedding parameters in the procedure name
  • Through direct SQL queries
  • Using OleDbCommand parameters
  • Using SqlParameter objects
In ADO.NET, parameters are passed to a stored procedure using SqlParameter objects. These objects allow for type-safe and secure parameter passing, helping prevent SQL injection attacks and ensuring correct data types.

The ___________ class is responsible for managing database connections efficiently.

  • SqlCommand
  • SqlConnection
  • SqlConnectionFactory
  • SqlDataAdapter
The SqlConnection class in ADO.NET is responsible for managing database connections efficiently. It represents a connection to a SQL Server database and provides methods for opening, closing, and managing transactions on the connection. SqlConnection is essential for establishing a connection to a database server and executing commands against it. It also handles connection pooling internally, which helps in optimizing connection usage and improving performance by reusing existing connections instead of creating new ones for each database operation. Understanding how to effectively work with SqlConnection is fundamental for building scalable and efficient database-driven applications in .NET.

In ASP.NET, what control is often used for displaying and editing tabular data with data binding capabilities?

  • DropDownList
  • GridView
  • ListBox
  • Repeater
GridView control is commonly used for displaying and editing tabular data in ASP.NET applications. It offers powerful data-binding capabilities, allowing developers to easily bind data from various data sources and display it in a tabular format. It also supports features like sorting, paging, and editing, making it a preferred choice for working with tabular data.