Async and await keywords in C Sharp (C#) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare an asynchronous method.

C Sharp (C#)

public [1] Task<int> GetNumberAsync() {
    return Task.FromResult(5);
}

Drag options to blanks, or click blank then click option'

Aasync

Bawait

Cstatic

Dvoid

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'await' instead of 'async' in the method declaration.

Using 'void' as return type for async methods that return a value.

The async keyword marks a method as asynchronous, allowing use of await inside it.

2fill in blank

medium

Complete the code to wait for the asynchronous method to finish and get the result.

C Sharp (C#)

int result = [1] GetNumberAsync();

Drag options to blanks, or click blank then click option'

ATask

Basync

Cawait

Dreturn

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'async' instead of 'await' when calling the method.

Not using any keyword and trying to assign the Task directly to an int.

The await keyword waits for the asynchronous method to complete and returns its result.

3fill in blank

hard

Fix the error in the asynchronous method by completing the code.

C Sharp (C#)

public async Task<string> GetMessageAsync() {
    [1] Task.Delay(1000);
    return "Done";
}

Drag options to blanks, or click blank then click option'

Aasync

Bawait

Creturn

Dyield

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting to use 'await' before Task.Delay.

Using 'async' inside the method body instead of in the method signature.

The await keyword is needed to wait for the delay to complete before continuing.

4fill in blank

hard

Fill both blanks to create an asynchronous method that returns the length of a string after a delay.

C Sharp (C#)

public [1] Task<int> GetLengthAsync(string text) {
    [2] Task.Delay(500);
    return Task.FromResult(text.Length);
}

Drag options to blanks, or click blank then click option'

Aasync

Bawait

Cstatic

Dvoid

Attempts:

3 left

💡 Hint

Common Mistakes

Not marking the method as async.

Not awaiting the Task.Delay call.

The method must be marked async and use await to wait for the delay.

5fill in blank

hard

Fill all three blanks to create an async method that awaits a delay, then returns the uppercase version of a string.

C Sharp (C#)

public [1] Task<string> ConvertToUpperAsync(string input) {
    [2] Task.Delay(700);
    return Task.FromResult(input[3]);
}

Drag options to blanks, or click blank then click option'

Aasync

Bawait

C.ToUpper()

D.ToLower()

Attempts:

3 left

💡 Hint

Common Mistakes

Using .ToLower() instead of .ToUpper().

Forgetting to await the Task.Delay.

Not marking the method as async.

The method is marked async, uses await to wait for the delay, and calls .ToUpper() on the input string.