How do you apply sorting to a DataView in ADO.NET?
- By using the Sort property
- By using the Select method with an ORDER BY clause
- By using the Sort method
- By setting the OrderBy property
The correct option is option 3, By using the Sort method. The Sort method allows you to specify the column(s) and the sort order(s) for the DataView. This enables you to arrange the data in the desired sequence, facilitating easier data manipulation and presentation.
Scenario: You need to read data from a large SQL Server database. Which ADO.NET data reader should you use, and why?
- DbDataReader
- OleDbDataReader
- OracleDataReader
- SqlDataReader
SqlDataReader provides the most efficient way to read data from a SQL Server database due to its optimized design specifically for SQL Server. It provides a forward-only, read-only stream of data, reducing memory consumption and increasing performance when dealing with large datasets. OleDbDataReader is used for OLE DB data sources, OracleDataReader is specific to Oracle databases, and DbDataReader is the base class for all ADO.NET data readers, providing more generic functionality.
How can you manage the state of a database connection in ADO.NET?
- By opening and closing the connection manually
- By setting the ConnectionState property
- By using connection pooling
- By using transactions
The state of a database connection in ADO.NET can be managed by setting the ConnectionState property of the SqlConnection object. This property indicates whether the connection is open, closed, connecting, executing a command, or fetching results. By checking and setting this property, developers can ensure that connections are used appropriately and efficiently throughout the application.
Entity Framework allows developers to work with databases using ___________ instead of SQL queries.
- C# (C Sharp)
- JSON (JavaScript Object Notation)
- LINQ (Language Integrated Query)
- XML (eXtensible Markup Language)
Entity Framework allows developers to work with databases using LINQ (Language Integrated Query) instead of SQL queries. LINQ provides a consistent query syntax to work with various data sources, including databases, collections, and XML. It allows developers to write queries using familiar C# syntax, which are then translated into SQL queries by Entity Framework.
When working with optimistic concurrency, ADO.NET uses ___________ columns to track changes made to rows.
- Tracking
- Revision
- Version
- Identification
The correct option is "Version". ADO.NET uses version columns to track changes made to rows when working with optimistic concurrency.
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.