How can you create a filtered view of data from a DataSet using DataViews?
- Use the DataView.Filter method to apply a filter expression to the DataView.
- Use the DataView.RowFilter property to specify filter criteria based on column values.
- Use the DataView.RowStateFilter property to filter rows based on their state (e.g., Added, Modified, Deleted).
- Use the DataView.Select method to select specific rows from the DataView.
To create a filtered view of data from a DataSet using DataViews, you can use the RowFilter property of the DataView. This property allows you to specify filter criteria based on column values, thereby creating a filtered view of the data according to your requirements.
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.
In ADO.NET Entity Framework, the [Key] attribute is often used to specify the ___________ property of an entity.
- Foreign
- Identity
- Navigation
- Primary
The [Key] attribute in Entity Framework is commonly applied to specify the identity property of an entity, indicating the property that uniquely identifies each instance of the entity.
When multiple users are modifying the same data concurrently, ___________ can help ensure data integrity.
- Constraints
- Isolation
- Locking
- Transactions
In scenarios where multiple users are modifying the same data concurrently, concurrency control mechanisms such as locking can help ensure data integrity by preventing conflicting modifications from occurring simultaneously.
In DataGrid or DataGridView controls, you can enable data editing by setting the "___________" property.
- AllowEdit
- EditEnabled
- EditMode
- Editable
In DataGrid or DataGridView controls, you can enable data editing by setting the "EditMode" property to allow users to edit the data displayed in the control.
To optimize LINQ queries for performance, you can use the ___________ method to reduce the number of database calls.
- Aggregate
- AsQueryable
- Join
- Select
To optimize LINQ queries for performance, you can use the AsQueryable method to reduce the number of database calls. This method converts an IEnumerable collection to an IQueryable collection, allowing the query to be executed on the database server instead of in-memory. This can lead to significant performance improvements, especially when dealing with large datasets or complex queries.
To improve LINQ query performance, you can use the DataLoadOptions class to specify ___________ loading.
- Eager
- Lazy
- Deferred
- Immediate
Eager loading retrieves all related data at once, which can enhance performance by reducing the number of database calls. This is done using the LoadWith method of DataLoadOptions.