Question 1

________ programming is a technique for writing apps containing tasks that can execute asynchronously,which can improve app performance and GUI responsiveness in apps with long-running or compute-intensive tasks.
A) synchronous
B) object-oriented
C) task-oriented
D) Asynchronous

Accepted Answer

Asynchronous programming

Question 2

Class Task is part ofNET's Task Parallel Library (TPL)for asynchronous programming.Task static method Run receives a ________ as an argument and executes a method in a separate thread.The method returns a Task< TResult > where TResult represents the type of value returned by the method being executed. A) callback B) Func< TResult > delegate C) Task D) thread

Accepted Answer

Func< TResult > delegate

Question 3

The _________ delegate represents any method that takes no arguments and returns a result.
A) Func< TResult >
B) async
C) task
D) TResult

Accepted Answer

Func< TResult >.

Question 4

When an async method encounters an await expression: If the asynchronous task has already completed,________.
A) the async method simply continues executing
B) the async method splits off another thread
C) the await method is called
D) the async method terminates

Accepted Answer

the async method simply continues executing

Question 5

The async ________ and await _________ greatly simplify asynchronous programming,reduce errors and enable your apps to take advantage of the processing power in today's multicore computers,smartphones and tablets.
A) modifier, operator
B) modifier, modifier
C) operator, operator
D) operator, modifier

Accepted Answer

modifier,operator

Question 6

The async modifier indicates that a method or ________ expression contains at least one await expression.
A) attribute
B) lambda
C) property
D) iterator

Accepted Answer

lambda

Question 7

The async and await mechanism does not create new threads.The method that you call to start an asynchronous task on which you ________ the results is responsible for creating any threads that are used to perform the asynchronous task.
A) await
B) process
C) discard
D) save

Accepted Answer

The correct choice is A, as it is the only option that fits with the statement. The 'await' keyword does not create new threads, but waits for the completion of the asynchronous task and returns the results. The other options are irrelevant to the statement.

Question 8

If a long-running calculation were to be performed synchronously in a GUI app,________.
A) the GUI app would split off the long-running calculation into a separate thread.
B) the GUI would freeze until the calculation completed and the user would not be able to interact with the app
C) the app would terminate
D) the app would deadlock

Accepted Answer

the GUI would freeze until the calculation completed and the user would not be able to interact with the app.

Question 9

Today's ________ computers,smartphones and tablets enable computers to perform tasks truly concurrently.
A) large memory
B) multiscreen
C) soft keyboard
D) multicore

Accepted Answer

Multicore computers have multiple processors on a single chip, allowing them to perform tasks simultaneously, or concurrently. This enables tasks such as running multiple applications or processing large amounts of data to be done more efficiently. Large memory, multiscreen, and soft keyboard do not directly enable concurrent task performance.

Question 10

Many classes for web access,file processing,networking,image processing and more contain methods that return ________ objects for use with async and await,so you can take advantage of the asynchronous programming model.
A) threads
B) Task
C) Transient
D) Token

Accepted Answer

The correct answer is B) Task. Many classes in .NET contain methods that return Task objects for use with async and await, allowing developers to take advantage of the asynchronous programming model. A Task represents an asynchronous operation that can be awaited and allows the caller to continue with other work while waiting for the operation to complete.

Question 11

A method is declared async to indicate to the compiler that the method will ________.
A) wait for a callback
B) perform a synchronous activity
C) create multiple threads
D) await an asynchronous task

Accepted Answer

await an asynchronous task

Question 12

When you await a Task,if that Task has already completed,execution simply continues.Otherwise,control returns to ________ until the result of the Task is available.Once the Task completes,the async method continues execution.
A) the async method
B) the await clause
C) the async method's caller
D) the await method's caller

Accepted Answer

the async method's caller

Question 13

Only computers that have ________ can truly execute multiple asynchronous tasks concurrently.
A) a processor
B) multiple processors or cores
C) very large memories
D) two of each type of I/O device

Accepted Answer

multiple processors or cores

Question 14

Visual C# apps can have multiple threads of execution,where each thread has its own ________ stack,allowing it to execute concurrently with other threads while sharing with them application-wide resources such as memory and processors.This capability is called multithreading.
A) method-call
B) attribute
C) memory
D) application

Accepted Answer

method-call

Question 15

A Task promises to ________.
A) behave itself
B) run to completion
C) create multiple threads
D) return a result at some point in the future

Accepted Answer

return a result at some point in the future.

Question 16

An async method executes its body in ________.
A) the calling method
B) the called method
C) the main method
D) the same thread as the calling method

Accepted Answer

the same thread as the calling method

Question 17

The mechanisms for determining whether to return control to the async method's caller or continue executing the async method,and for continuing the async method's execution when the asynchronous task completes are handled by ________.
A) a .NET library routine
B) a user-defined method
C) a custom interface
D) code that's written for you by the compiler

Accepted Answer

code that's written for you by the compiler

Question 18

Tasks that proceed independently of one another are said to execute ________ and are referred to as ________ tasks.
A) synchronously, synchronous
B) independently, independent
C) asynchronously, asynchronous
D) intensively, intensive

Accepted Answer

asynchronously,asynchronous

Question 19

Task property ________ returns the value returned by a Task.
A) Result
B) Value
C) TaskReturn
D) TaskValue

Accepted Answer

Result.

Question 20

In effect,an async method allows you to write code that looks like it executes ________,while the compiler deals with the complicated issues of managing asynchronous execution.
A) efficiently
B) outside any method
C) sequentially
D) repeatedly

Accepted Answer

sequentially.

Quiz 23: Asynchronous Programming With Async and Await

________ programming is a technique for writing apps containing tasks that can execute asynchronously,which can improve app performance and GUI responsiveness in apps with long-running or compute-intensive tasks.

The _________ delegate represents any method that takes no arguments and returns a result.

When an async method encounters an await expression: If the asynchronous task has already completed,________.

The async and await _ greatly simplify asynchronous programming,reduce errors and enable your apps to take advantage of the processing power in today's multicore computers,smartphones and tablets.

The async modifier indicates that a method or ________ expression contains at least one await expression.

The async and await mechanism does not create new threads.The method that you call to start an asynchronous task on which you ________ the results is responsible for creating any threads that are used to perform the asynchronous task.

If a long-running calculation were to be performed synchronously in a GUI app,________.

Today's ________ computers,smartphones and tablets enable computers to perform tasks truly concurrently.

Many classes for web access,file processing,networking,image processing and more contain methods that return ________ objects for use with async and await,so you can take advantage of the asynchronous programming model.

A method is declared async to indicate to the compiler that the method will ________.

When you await a Task,if that Task has already completed,execution simply continues.Otherwise,control returns to ________ until the result of the Task is available.Once the Task completes,the async method continues execution.

Only computers that have ________ can truly execute multiple asynchronous tasks concurrently.

Visual C# apps can have multiple threads of execution,where each thread has its own ________ stack,allowing it to execute concurrently with other threads while sharing with them application-wide resources such as memory and processors.This capability is called multithreading.

A Task promises to ________.

An async method executes its body in ________.

The mechanisms for determining whether to return control to the async method's caller or continue executing the async method,and for continuing the async method's execution when the asynchronous task completes are handled by ________.

Tasks that proceed independently of one another are said to execute and are referred to as tasks.

Task property ________ returns the value returned by a Task.

In effect,an async method allows you to write code that looks like it executes ________,while the compiler deals with the complicated issues of managing asynchronous execution.