LINQ to SQL allows you to define relationships between entities using _______ associations.
- declarative
- navigational
- relational
- structural
LINQ to SQL allows the definition of relationships between entities using declarative associations, which are specified using attributes such as ForeignKeyAttribute and AssociationAttribute.
When might you use the ToTable() method on a DataView in ADO.NET?
- When you want to create a new DataTable from the DataView
- When you want to add a new table to the DataSet
- When you want to convert the DataView to an array
- When you want to remove duplicate rows from the DataView
The correct option is option 1, When you want to create a new DataTable from the DataView. The ToTable() method in ADO.NET is used to generate a new DataTable containing the same data as the DataView. This is helpful when you need to work with the DataView's data in a DataTable format for further processing or manipulation.
SQL injection is a security vulnerability that primarily affects which aspect of database operations?
- Data availability
- Data confidentiality
- Data integrity
- Data security
SQL injection primarily affects data security by allowing attackers to manipulate database queries to access, modify, or delete sensitive data unauthorizedly. This undermines the security of the application and compromises the confidentiality, integrity, and availability of data.
The WHERE clause in a SELECT statement is used to specify a ___________ condition for the retrieved data.
- Filtering
- Grouping
- Joining
- Sorting
The WHERE clause is used in SQL to filter rows based on a specified condition. It allows you to narrow down the result set by specifying criteria that rows must meet to be included in the output. This clause is essential for retrieving specific data that meets certain conditions from a database table.
Scenario: You are working on a Windows Forms application that requires displaying a large dataset in a tabular format with sorting and filtering options. Which control would you choose, DataGrid or DataGridView, and why?
- DataGrid
- DataGridView
- Either control can be used
- It depends on the specific requirements of the application
The DataGridView control is preferred over DataGrid for its enhanced features and flexibility. DataGridView offers built-in support for sorting, filtering, and customization of cell styles, making it more suitable for displaying large datasets with sorting and filtering options. Additionally, DataGridView provides better performance and scalability compared to DataGrid. Therefore, DataGridView would be the recommended choice for this scenario.
You are tasked with creating a .NET application that interacts with a SQL Server database. You want to use a DataAdapter to efficiently populate a DataTable with the result set of a complex SQL query. Which method of the DataAdapter would you use for this purpose?
- Fill
- FillSchema
- GetData
- Update
The Fill method of the DataAdapter is used to populate a DataTable or a DataSet with the result set of a SQL query. It efficiently retrieves data from the database and populates the specified DataTable with the result set, making it suitable for populating a DataTable with the result set of a complex SQL query in a .NET application.
Which method is used to create a DataView from a DataTable in ADO.NET?
- DataTable.CreateView()
- DataTable.DefaultView()
- DataView.CreateFromTable()
- DataView.Table()
The method used to create a DataView from a DataTable in ADO.NET is DataTable.DefaultView(). This method returns a DataView object representing a customized view of the DataTable, which can then be manipulated and used for various data operations such as sorting, filtering, and navigation. It provides a convenient way to work with subsets of data within a DataTable.
What are the common strategies for handling data conflicts in ADO.NET?
- Automatic conflict resolution strategy
- Last-writer-wins strategy
- Manual conflict resolution strategy
- Merge replication strategy
Common strategies for handling data conflicts in ADO.NET include implementing manual conflict resolution where the user is prompted to resolve conflicts, or automatic conflict resolution where predefined rules or custom logic resolve conflicts without user intervention.
In LINQ to Entities, what is an Entity Data Model (EDM)?
- A method for executing SQL queries directly on the database
- A programming language for querying databases
- A representation of the conceptual model of data in a database
- A tool for designing user interfaces
An Entity Data Model (EDM) in LINQ to Entities represents the conceptual model of data in a database. It defines the structure of the data and the relationships between entities. EDM provides a higher-level abstraction over the database schema, allowing developers to work with entities and relationships rather than tables and columns directly.
ADO.NET provides the ___________ event to customize conflict resolution logic.
- ConflictCustomized
- ConflictCustomizing
- ConflictHandling
- ConflictResolved
ADO.NET provides the ConflictHandling event to customize conflict resolution logic. This event allows developers to define custom conflict resolution strategies when updating data from a data source. By handling this event, developers can implement logic to resolve conflicts that arise when multiple users attempt to modify the same data concurrently.