The Repeater control relies heavily on ________ binding to display data.

  • Design-time
  • Run-time
  • Static
  • Dynamic
The Repeater control in ADO.NET relies heavily on dynamic binding to display data. Dynamic binding involves binding data to the control at runtime, allowing for flexibility in displaying different datasets without needing to modify the control's structure at design time. This makes it a versatile option for displaying various datasets in web applications.

In LINQ to DataSet, the where clause is used to ___________ elements based on a specified condition.

  • Filter
  • Sort
  • Join
  • Group
The correct option is 'Filter'. In LINQ to DataSet, the where clause is used to filter elements from the result set based on a specified condition. It allows you to include only those elements that satisfy the specified condition.

When dealing with complex inheritance scenarios in Entity Framework, which mapping strategy can be used to map entities to multiple related tables?

  • Table Per Concrete Class (TPC)
  • Table Per Entity (TPE)
  • Table Per Hierarchy (TPH)
  • Table Per Type (TPT)
Table Per Type (TPT) mapping strategy in Entity Framework is used for complex inheritance scenarios where each derived type is mapped to its own table, containing only the properties specific to that type. This approach ensures a normalized database schema and allows for efficient querying and data retrieval without redundancy. TPH maps all types in an inheritance hierarchy to a single table, leading to potential data integrity and performance issues. TPC maps each concrete class to its own table, resulting in redundant columns and denormalized data. TPE is not a standard mapping strategy in Entity Framework.

How does Entity Framework handle database schema changes in a Code-First approach?

  • Entity Framework automatically updates the database schema without requiring any manual intervention from developers.
  • Entity Framework generates a new database schema from scratch with each change, discarding existing data.
  • Entity Framework generates migration files that represent incremental changes to the database schemDevelopers can apply these migrations to update the database schema without losing data.
  • Entity Framework prompts developers to manually update the database schema by executing SQL scripts.
In a Code-First approach with Entity Framework, database schema changes are managed through migrations. When developers modify the application's data model, Entity Framework generates migration files that represent these changes. Developers can then apply these migrations to update the database schema incrementally. Entity Framework tracks the history of migrations applied to the database, allowing developers to roll back changes if needed. This approach enables developers to evolve the database schema alongside the application's data model while preserving existing data.

Data readers are typically used for which type of database operations?

  • Creating new database objects
  • Deleting database objects
  • Reading data from the database
  • Updating data in the database
Data readers in ADO.NET are primarily used for reading data from the database. They provide a lightweight and efficient way to sequentially retrieve query results, allowing applications to process large datasets without the overhead of loading the entire result set into memory. While data readers excel at data retrieval operations, they are not designed for updating or modifying data in the database, as they provide read-only access to query results.

The where clause in LINQ is used for ___________ elements based on specified criteria.

  • Aggregating
  • Filtering
  • Grouping
  • Sorting
The where clause in LINQ is primarily used for filtering elements based on specified criteria, allowing developers to select only those that meet certain conditions.

One of the advantages of data binding is that it helps in keeping the UI and ___________ in sync.

  • Business logic
  • Data manipulation
  • Database
  • Presentation
One of the advantages of data binding is that it helps in keeping the UI and presentation in sync with the underlying data, ensuring consistency between what is displayed and what is stored.

Scenario: In a LINQ to DataSet query, you encounter the concept of deferred execution. Explain what deferred execution means and provide an example of when it might be advantageous.

  • Execution of query happens after modifying the underlying data.
  • Execution of query happens in parallel with other operations.
  • Execution of query is immediate and results are generated as soon as the query is executed.
  • Execution of query is postponed until the results are actually requested or iterated over.
Deferred execution means that the execution of the LINQ query is delayed until the results are actually needed. This postponement allows for better performance optimization, especially when dealing with large datasets, as it avoids unnecessary computations until the results are required. For example, when dealing with complex queries or when the query result is not immediately needed, deferred execution can be advantageous in terms of resource utilization.

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?

  • DataSet
  • SqlConnection
  • SqlDataAdapter
  • SqlDataReader
The DataSet class in ADO.NET is designed to store and manage data in a tabular format, making it suitable for use in Windows Forms applications where data needs to be displayed and edited. It provides a disconnected architecture, allowing data to be manipulated independently of the database.

What does "EF" stand for in the context of ADO.NET?

  • Entity Facade
  • Entity Factory
  • Entity Flow
  • Entity Framework
Entity Framework (EF) stands for Entity Framework. It is an Object-Relational Mapping (ORM) tool provided by ADO.NET, facilitating developers to work with relational data as domain-specific objects, eliminating the need for most of the data access plumbing code.