How does a Dataset provide disconnected data access in ADO.NET?
- By storing data retrieved from a database in memory
- By directly querying the database
- By establishing a persistent connection to the database
- By executing stored procedures
A Dataset in ADO.NET provides disconnected data access by storing data retrieved from a database in memory. This allows applications to work with the data without maintaining a constant connection to the database server. The other options are incorrect as they do not describe how disconnected data access is achieved.
LINQ provides a unified and concise way to query and manipulate ___________ data.
- Object
- Relational
- SQL
- XML
LINQ, or Language Integrated Query, allows developers to query and manipulate objects in various data sources, including objects in memory.
In ADO.NET, the RowVersion column is used to track ___________.
- Data concurrency
- Data integrity
- Data synchronization
- Data validation
The RowVersion column in ADO.NET is used to track data concurrency, enabling efficient detection of changes and conflicts between different users.
In your ASP.NET application, you want to display a list of products from a database and allow users to edit them. What type of data binding would be suitable for this scenario, and why?
- Two-way data binding
- Data binding with LINQ to SQL
- Data binding with DataReader
- Data binding with DataList control
Two-way data binding would be suitable for this scenario. This type of data binding allows changes made in the UI to automatically update the underlying data source, and vice versa. In an ASP.NET application, this means users can edit the product list directly in the UI, and those changes will be reflected back to the database. Two-way data binding simplifies the development process and improves user experience by ensuring seamless interaction between the UI and the data source. The other options either lack support for bidirectional data flow or involve more complex implementations.
In Windows Forms, the ___________ event is commonly used to update the user interface after data changes.
- DataChanged
- DataUpdated
- DataSourceChanged
- DataBindingComplete
The correct option is DataBindingComplete. This event is commonly used in Windows Forms applications to update the user interface after data changes. It occurs after a data-binding operation has finished, allowing developers to perform additional tasks or updates to the user interface based on changes to the data source.
In ADO.NET, what is the purpose of the Connection Pooling feature?
- To automatically update database schemas
- To improve security by encrypting database connections
- To manage the connections between a .NET application and a database
- To optimize network bandwidth usage
Connection Pooling in ADO.NET is used to efficiently manage database connections between a .NET application and a database server. It helps in reusing existing connections, thus reducing the overhead of opening and closing connections frequently. This improves application performance and scalability by minimizing the time spent on establishing new connections.
ADO.NET Entity Framework is an Object-Relational Mapping (ORM) tool that helps in bridging the gap between ___________ and ___________.
- Application Layer and Database Layer
- Business Logic and Presentation Layer
- C# and SQL
- Object-Oriented Programming (OOP) and Database Management Systems (DBMS)
ADO.NET Entity Framework bridges the gap between Object-Oriented Programming (OOP) and Database Management Systems (DBMS). It allows developers to work with relational data using domain-specific objects, thus enhancing productivity and reducing development time by abstracting the complexity of database interaction.
In ADO.NET, what is the role of a DataTable within a dataset?
- Acts as a connection manager
- Holds data retrieved from a data source
- Represents a single table of data in memory
- Stores metadata about the data structure
A DataTable within a dataset serves as an in-memory representation of a single table retrieved from a data source. It holds the actual data rows along with metadata such as column names, data types, and constraints. This allows for disconnected access to data, enabling offline manipulation and processing.
In the context of DropDownList controls, what is the purpose of the DataTextField property?
- Defines the field that will be used to identify each item in the DropDownList
- Determines the field that will be used to populate the DropDownList with data
- Sets the text color of the items in the DropDownList
- Specifies the connection string to the database
The DataTextField property of a DropDownList control is used to specify the field from the data source that will be used to populate the control with data. This property helps determine which data field will be displayed as the text for each item in the DropDownList. It's crucial for ensuring that the DropDownList accurately reflects the data retrieved from the database or another data source.
Resource management in ADO.NET includes handling of connections, ___________, and other database-related resources.
- Indexes
- Queries
- Transactions
- Views
In addition to managing connections, ADO.NET also involves handling transactions, which are sets of operations that are treated as a single unit of work. Proper transaction management ensures data integrity and consistency in the database.