In ASP.NET, what control is often used for displaying and editing tabular data with data binding capabilities?
- DropDownList
- GridView
- ListBox
- Repeater
GridView control is commonly used for displaying and editing tabular data in ASP.NET applications. It offers powerful data-binding capabilities, allowing developers to easily bind data from various data sources and display it in a tabular format. It also supports features like sorting, paging, and editing, making it a preferred choice for working with tabular data.
The ___________ class is responsible for managing database connections efficiently.
- SqlCommand
- SqlConnection
- SqlConnectionFactory
- SqlDataAdapter
The SqlConnection class in ADO.NET is responsible for managing database connections efficiently. It represents a connection to a SQL Server database and provides methods for opening, closing, and managing transactions on the connection. SqlConnection is essential for establishing a connection to a database server and executing commands against it. It also handles connection pooling internally, which helps in optimizing connection usage and improving performance by reusing existing connections instead of creating new ones for each database operation. Understanding how to effectively work with SqlConnection is fundamental for building scalable and efficient database-driven applications in .NET.
How do you pass parameters to a stored procedure in ADO.NET?
- By embedding parameters in the procedure name
- Through direct SQL queries
- Using OleDbCommand parameters
- Using SqlParameter objects
In ADO.NET, parameters are passed to a stored procedure using SqlParameter objects. These objects allow for type-safe and secure parameter passing, helping prevent SQL injection attacks and ensuring correct data types.
Your team is debating whether to use Code-First or Database-First in Entity Framework for an upcoming project. What factors should you consider when making this decision?
- Development Speed, Code Control
- Existing Database Structure, Visual Modeling
- Performance Optimization, Code Reusability
- Project Complexity, Team Skillset
When deciding between Code-First and Database-First in Entity Framework, factors such as the existing database structure and the availability of visual modeling tools should be considered. Database-First is suitable when working with an existing database schema or when visual modeling is preferred. On the other hand, Code-First provides more control over the code and development process, making it suitable for projects where development speed and code control are essential.
You are designing a multi-tier application where data needs to be transferred between the presentation layer and the database. Which ADO.NET component plays a crucial role in managing data synchronization in this architecture?
- DataSet
- SqlCommand
- SqlConnection
- SqlDataAdapter
The DataSet plays a crucial role in managing data synchronization in a multi-tier application architecture. It acts as an in-memory cache of data retrieved from the database and provides a disconnected data model, allowing data to be transferred between the presentation layer and the database in a flexible and efficient manner.
The ___________ control in ADO.NET simplifies the process of binding to custom business objects.
- DataGrid
- ListView
- GridView
- ObjectDataSource
The ObjectDataSource control in ADO.NET streamlines the process of binding to custom business objects, hence the correct option is "ObjectDataSource".
When optimizing LINQ queries for performance, what is "query optimization"?
- Eliminating unnecessary data retrieval and processing to improve query efficiency
- Increasing the complexity of queries to achieve better results
- Reducing the number of joins in a query
- Using LINQ syntax exclusively without SQL
Query optimization in LINQ involves techniques such as using appropriate indexes, selecting only necessary columns, and minimizing data transfer between the database and application to improve performance. It aims to eliminate unnecessary data retrieval and processing, thus enhancing query efficiency.
When using Oracle databases, you would use the ___________ class as a command object.
- OracleCommand
- SqlCommand
- DbCommand
- OleDbCommand
The correct option is OracleCommand. When working with Oracle databases in .NET applications, the OracleCommand class is specifically designed to execute commands against an Oracle database. It provides methods and properties to facilitate database interactions, making it the appropriate choice as a command object for Oracle databases.
Scenario: Your application needs to retrieve data from a database and display it in a tabular format. Which ADO.NET control or component would be suitable for this purpose?
- DataGrid
- DataGridView
- ListBox
- TextBox
DataGridView is a versatile ADO.NET control used to display data in a tabular format. It provides features like sorting, filtering, and editing of data, making it suitable for displaying database query results in a tabular format within applications.
In Entity Framework, what does the Code-First approach emphasize?
- Code-based entity and database creation
- Database-first design
- Model-first development
- Database schema generation
The correct option is Code-based entity and database creation. The Code-First approach in Entity Framework emphasizes defining your domain model using plain CLR objects (POCO classes) and then creating the database from these classes.
Data binding to list controls simplifies the process of presenting ___________ from a data source to users.
- Hierarchical data
- Tabular data
- Structured data
- Unstructured data
The correct option is 2. Tabular data. Data binding to list controls simplifies the process of presenting tabular data from a data source to users, making it easier to display information in a structured and organized format.
How can you implement custom data binding in a WinForms application?
- Implement the IDataBinding interface, override the necessary methods, and manually bind data to controls
- Implement the INotifyPropertyChanged interface in the data source class, handle the PropertyChanged event, and update the bound controls accordingly
- Inherit from the Control class, override the DataBind method, and define custom binding logic
- Use the Binding class to create custom binding expressions, handle the DataBinding event, and manually update the controls
Custom data binding in WinForms can be implemented by making the data source class implement the INotifyPropertyChanged interface. This allows the data source to notify the UI controls when a property value changes, ensuring that the bound controls reflect the updated data.