Exam 23: Asynchronous Programming With Async and Await

Executing asynchronous methods in separate threads on a dual-core computer typically ________ executing the same tasks sequentially.

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.

You cannot bind a LINQ query's result directly to a ListBox.You must first ________.

Task static method ________ enables you to wait for any one of several Tasks specified as arguments to complete-the method returns the Task that completes first.

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

Enumerable static method ________ creates a list of elements containing the first argument's value.The length of the list is specified by the second argument.

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 ________.

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

Task property ________ returns the value returned by a Task.

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.

An app that performs synchronous tasks on a single-core computer often takes longer to execute than on a multi-core computer,because ________.

Because ________,asynchronous Tasks are frequently used in GUI apps that invoke web services (or perform network communication in general)to ensure that the apps remain responsive.

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.

Handling short computations in the GUI thread ________.

WebClient's ________ method terminates its executing asynchronous task.

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

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.

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 Task promises to ________.

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