Scenario: You need to display a list of products from a database, and you want full control over the HTML markup for each product item. Which ADO.NET control would you choose, and why?
- DataList
- GridView
- ListBox
- Repeater
The Repeater control in ADO.NET would be the optimal choice for this scenario. It offers the highest level of flexibility in defining the HTML markup for each item in the list. Unlike other controls like DataList or GridView, the Repeater control does not impose any predefined structure on the output, allowing you to have full control over the generated HTML. This makes it ideal for scenarios where custom HTML markup is required, such as displaying products with specific styling or layout requirements.
Explain how Entity Framework handles database migrations and versioning.
- Entity Framework Code First Migrations
- Manually altering database schema
- Using stored procedures
- Using third-party migration tools
Entity Framework Code First Migrations is a feature that automates the process of incrementally updating the database schema to match changes in the application's data model. It tracks changes to the entity classes and generates SQL scripts to apply those changes to the database. This approach allows developers to evolve the database schema over time without losing data or disrupting the application's functionality. Manually altering the database schema can be error-prone and time-consuming, while using stored procedures for migration limits flexibility and maintainability. Third-party migration tools may offer additional functionality but may require extra setup and integration.
What does LINQ stand for in the context of C# and .NET?
- Language-Integrated Query
- Lightweight Integration Query
- Linear Interpolated Query
- Linking Interactive Query
LINQ stands for Language-Integrated Query. It provides a set of features that allow for querying data directly from C# or VB.NET code, making it easier to interact with various data sources such as databases, XML, and collections.
In a LINQ query, the orderby clause is used to ___________ the elements in the result set.
- Arrange
- Filter
- Sort
- Group
The "orderby" clause in a LINQ query is used to sort the elements in the result set based on specified criteria. Hence, it sorts the elements, not arranges or filters them. "Sort" is the correct option.
Which part of an Entity Data Model (EDM) is responsible for mapping entity properties to database columns?
- Conceptual Layer
- Mapping Layer
- Presentation Layer
- Storage Layer
Mapping Layer
Scenario: You are developing a financial application, and you need to create a filtered view of transactions that occurred in the last quarter of the year. What methods and properties of DataViews would you use to achieve this?
- FindRows() method
- RowStateFilter property
- Sort property
- RowFilter property
The correct option is "RowFilter property". To create a filtered view of transactions that occurred in the last quarter of the year, you can use the RowFilter property of the DataView. By setting the RowFilter property to a condition that filters transactions based on the date range corresponding to the last quarter, you can obtain the desired filtered view.
Scenario: In a hierarchical dataset representing a company's organizational structure, you need to find all employees reporting to a specific manager. Which ADO.NET feature would you utilize to achieve this?
- DataAdapter
- DataRelations
- DataView
- Hierarchical Data Binding
To find all employees reporting to a specific manager in a hierarchical dataset representing a company's organizational structure, you would utilize DataRelations. DataRelations allow establishing relationships between tables in a dataset, enabling the traversal of hierarchical data. By defining relationships between tables, you can navigate through parent-child relationships to access related data efficiently. DataViews provide a customized view of a DataTable but do not directly handle hierarchical relationships. DataAdapters are used for database operations and do not inherently deal with hierarchical data. Hierarchical Data Binding is a concept related to UI frameworks for displaying hierarchical data structures.
Which LINQ operator is used for filtering data in LINQ to Entities queries?
- Join
- OrderBy
- Select
- Where
The Where operator is used for filtering data in LINQ to Entities queries. It allows developers to specify criteria to select only the elements from the data source that satisfy the given condition. This operator is essential for retrieving subsets of data based on specific criteria, such as filtering by certain property values or conditions.
What is LINQ an abbreviation for in the context of programming?
- Language Integrated Query
- Lightweight Interface Query
- Limited Integration Query
- Linked Interaction Query
LINQ stands for Language Integrated Query. It is a feature of .NET that provides a unified way of querying data from different data sources using a SQL-like syntax directly within C# or VB.NET code. It allows developers to write queries against collections, databases, XML, and other data sources.
What is the key difference between executing a SELECT command and executing a DELETE command in ADO.NET?
- DELETE command removes data
- DELETE command updates data
- SELECT command manipulates data
- SELECT command retrieves data
In ADO.NET, a SELECT command is used to retrieve data from a database table based on specified criteria, whereas a DELETE command is used to remove data from a table based on certain conditions. Therefore, the key difference lies in their actions: SELECT retrieves data, while DELETE removes data from the table. Understanding this fundamental distinction is crucial in database manipulation using ADO.NET.