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- content: "What is the purpose of using the `async` and `await` keywords in C# for file I/O operations?"
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choices:
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- content: "To create asynchronous methods that can perform file I/O operations without blocking the main thread."
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isCorrect: true
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explanation: "Correct. The `async` and `await` keywords allow for the creation of asynchronous methods that perform file I/O operations without blocking the main thread, improving application performance and responsiveness."
explanation: "Incorrect. The `async` and `await` keywords are used to perform operations asynchronously, not synchronously."
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- content: "To block the main thread until the file I/O operation is complete."
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isCorrect: false
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explanation: "Incorrect. The `async` and `await` keywords are used to perform operations without blocking the main thread."
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- content: "What is the purpose of the `HttpClient` class in C#?"
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choices:
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- content: "To make nonblocking calls to web resources asynchronously."
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isCorrect: true
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explanation: "Correct. The `HttpClient` class in C# is designed for asynchronous use, allowing nonblocking calls to web resources."
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- content: "To create multiple instances for each request to web resources."
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isCorrect: false
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explanation: "Incorrect. Creating a single instance of `HttpClient` and using it throughout the application is recommended."
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- content: "To block the UI thread while making calls to web resources."
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isCorrect: false
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explanation: "Incorrect. The `HttpClient` class is designed for asynchronous use, allowing nonblocking calls to web resources."
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- content: "What is the purpose of the Task Parallel Library (TPL) in C#?"
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choices:
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- content: "To provide a set of public types and APIs for managing database connections."
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isCorrect: false
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explanation: "Incorrect. The TPL doesn't manage database connections. It simplifies the process of adding parallelism and concurrency to applications."
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- content: "To provide a set of public types and APIs in the `System.Threading` and `System.Threading.Tasks` namespaces that simplify the process of adding parallelism and concurrency to applications."
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isCorrect: true
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explanation: "Correct. The TPL is designed to make developers more productive by simplifying the process of adding parallelism and concurrency to applications."
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- content: "To provide a set of public types and APIs for handling user interface events."
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isCorrect: false
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explanation: "Incorrect. The TPL isn't designed for handling user interface events. It's used for simplifying the process of adding parallelism and concurrency to applications."
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- content: "What is a common pitfall in data and task parallelism?"
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choices:
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- content: "Avoiding writing to shared memory locations."
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isCorrect: false
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explanation: "Incorrect. Writing to shared memory locations in parallel tasks can lead to race conditions and should be avoided."
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- content: "Assuming parallel is always faster."
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isCorrect: true
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explanation: "Correct. It's a common pitfall to assume that parallel tasks always run faster than sequential ones."
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- content: "Assuming parallel is always slower."
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isCorrect: false
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explanation: "Incorrect. It's a common misconception that parallel is always faster, not slower."
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- content: "What is the purpose of using `Parallel.ForEachAsync` and `Task.WhenAll` in a C# application?"
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choices:
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- content: "To connect the application to a database."
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isCorrect: false
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explanation: "Incorrect. These methods aren't used for database connections, but for managing tasks."
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- content: "To implement data parallelism."
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isCorrect: true
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explanation: "Correct. `Parallel.ForEachAsync` and `Task.WhenAll` are used to manage multiple tasks concurrently, implementing data parallelism."
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- content: "To create a user interface for the application."
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isCorrect: false
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explanation: "Incorrect. These methods aren't used for creating user interfaces, but for managing tasks."
Asynchronous and parallel programming are powerful techniques that can enhance the performance and responsiveness of your applications. In C#, these techniques are made simpler and more accessible through the use of keywords like `async` and `await`, and libraries like the Task Parallel Library (TPL).
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Imagine you're signed up to help a non-profit company with a software project. Before the project kicks off, you decide to update your programming skills by developing a banking app. To practice your asynchronous programming skills, you're going implement asynchronous versions of helper classes that implement file backup and restore processes.
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The topics covered in this module include:
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- Introduction to asynchronous programming in C#.
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- Implementing asynchronous file input and output in C#.
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- Asynchronous access to web resources using `HttpClient` in C#.
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- Implementing parallel programming and asynchronous tasks in C#.
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- Managing and handling exceptions in asynchronous and parallel tasks in C#.
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- Implementing data parallelism in C# using `Parallel.ForEachAsync` and `Task.WhenAll`.
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After completing this module, you’ll be able to:
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- Implement asynchronous programming in C# using the `async` and `await` keywords.
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- Perform asynchronous file input and output operations and access web resources asynchronously in C#.
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- Use the Task Parallel Library (TPL) in C# for parallel programming and managing concurrent data structures.
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- Identify common pitfalls in parallel programming and handle exceptions in async and parallel tasks.
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- Implement data parallelism in a C# application as part of a hands-on exercise.
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