The IsolationLevel enumeration in ADO.NET provides options such as ReadCommitted, which ensures that a transaction reads only committed data. RepeatableRead ensures that a transaction can reread data it has previously read.

Object-Relational Mapping (ORM)

ADO.NET allows developers to create custom data providers to support various databases, including NoSQL databases like MongoDB. Custom providers can extend ADO.NET's functionality to work with different data storage systems.

The correct option is "Code-First." Code-First is a feature of Entity Framework that allows developers to define the domain model classes first, and then generate the database schema based on those classes. This approach provides flexibility and control over the database design while working primarily with object-oriented code.

One technique for improving performance with large datasets is to implement paging, which involves retrieving and displaying a subset of data at a time. This approach reduces the amount of data transferred between the server and client, leading to faster page load times and improved responsiveness. Additionally, using efficient data retrieval methods such as stored procedures or indexed queries can help minimize database load and improve overall performance. Caching frequently accessed data and optimizing data binding operations can also contribute to better performance when working with Repeater and DataList controls.

In LINQ to DataSet, the Where clause is used for filtering data based on specified criteria. It allows you to specify conditions to filter the data and retrieve only the records that match those conditions. For this scenario, using the Where clause enables you to filter sales records based on the product category, thus achieving the desired result.

Stored procedures are commonly used in database applications for several reasons. They improve performance by reducing network traffic, as only the name of the stored procedure and any parameters need to be transmitted instead of the full SQL statements. They promote code reuse by encapsulating frequently used logic, reducing redundancy and making maintenance easier. Stored procedures also enhance security by controlling access to database objects and enforcing data integrity rules. Additionally, they can simplify application development by providing a standardized interface to complex business logic.

The Repeater control in ADO.NET allows developers to dynamically generate HTML or other markup for each item in a dataset. This means that the markup can be generated based on the data retrieved from the dataset, providing flexibility in the presentation of the data.

The correct option is CommandTimeout. In ADO.NET, the CommandTimeout property of a command object allows you to specify the maximum amount of time (in seconds) that a command can execute before it is terminated. This property is useful in scenarios where you want to control the execution time of commands, preventing long-running queries from affecting application performance or causing timeouts.

The size of the connection pool in ADO.NET can be configured by setting the "Max Pool Size" property in the connection string, specifying the maximum number of connections allowed in the pool.