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Programming in C#

Question No: 51 – (Topic 1)

You are developing an application. The application converts a Location object to a string by using a method named WriteObject. The WriteObject() method accepts two parameters, a Location object and an XmlObjectSerializer object.

The application includes the following code. (Line numbers are included for reference only.)

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You need to serialize the Location object as a JSON object. Which code segment should you insert at line 20?

  1. New DataContractSerializer(typeof(Location))

  2. New XmlSerializer(typeof(Location))

  3. New NetDataContractSenalizer()

  4. New DataContractJsonSerializer(typeof(Location))

Answer: D Explanation:

The DataContractJsonSerializer class serializes objects to the JavaScript Object Notation (JSON) and deserializes JSON data to objects.

Use the DataContractJsonSerializer class to serialize instances of a type into a JSON document and to deserialize a JSON document into an instance of a type.

Question No: 52 – (Topic 1)

You are developing an application. The application includes classes named Mammal and Animal and an interface named IAnimal.

The Mammal class must meet the following requirements:

-> It must either inherit from the Animal class or implement the IAnimal interface.

-> It must be inheritable by other classes in the application.

You need to ensure that the Mammal class meets the requirements.

Which two code segments can you use to achieve this goal? (Each correct answer presents a complete solution. Choose two.)

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  1. Option A

  2. Option B

  3. Option C

  4. Option D

Answer: A,C Explanation:

When applied to a class, the sealed modifier prevents other classes from inheriting from it. http://msdn.microsoft.com/en-us/library/88c54tsw(v=vs.110).aspx

Question No: 53 – (Topic 1)

You are developing an application that will transmit large amounts of data between a client computer and a server. You need to ensure the validity of the data by using a cryptographic hashing algorithm. Which algorithm should you use?

  1. DES

  2. HMACSHA512

  3. RNGCryptoServiceProvider

  4. ECDsa

Answer: B

Question No: 54 – (Topic 1)

You are developing a method named CreateCounters that will create performance counters for an application.

The method includes the following code. (Line numbers are included for reference only.)

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You need to ensure that Counter1 is available for use in Windows Performance Monitor (PerfMon).

Which code segment should you insert at line 16?

  1. CounterType = PerformanccCounterType.RawBase

  2. CounterType = PerformanceCounterType.AverageBase

  3. CounterType = PerformanceCounterType.SampleBase

  4. CounterType = PerformanceCounterType.CounterMultiBase

Answer: C Explanation:

PerformanceCounterType.SampleBase – A base counter that stores the number of sampling interrupts taken and is used as a denominator in the sampling fraction. The sampling fraction is the number of samples that were 1 (or true) for a sample interrupt. Check that this value is greater than zero before using it as the denominator in a calculation of SampleFraction.

PerformanceCounterType.SampleFraction – A percentage counter that shows the average ratio of hits to all operations during the last two sample intervals. Formula: ((N 1 – N 0) / (D 1 – D 0)) x 100, where the numerator represents the number of successful operations during the last sample interval, and the denominator represents the change in the number of all operations (of the type measured) completed during the sample interval, using counters of type SampleBase. Counters of this type include Cache\Pin Read Hits %. http://msdn.microsoft.com/en-us/library/system.diagnostics.performancecountertype.aspx

Question No: 55 – (Topic 1)

You are creating a console application named App1.

App1 retrieves data from the Internet by using JavaScript Object Notation (JSON).

You are developing the following code segment (line numbers are included for reference only):

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You need to ensure that the code validates the JSON string. Which code should you insert at line 03?

  1. DataContractSerializer serializer = new DataContractSerializer();

  2. var serializer = new DataContractSerializer();

  3. XmlSerlalizer serializer = new XmlSerlalizer();

  4. var serializer = new JavaScriptSerializer();

Answer: D

Explanation: The JavaScriptSerializer Class Provides serialization and deserialization functionality for AJAX-enabled applications.

The JavaScriptSerializer class is used internally by the asynchronous communication layer to serialize and deserialize the data that is passed between the browser and the Web server. You cannot access that instance of the serializer. However, this class exposes a public API. Therefore, you can use the class when you want to work with JavaScript Object Notation (JSON) in managed code.

Question No: 56 DRAG DROP – (Topic 1)

You are developing an application that implements a set of custom exception types. You declare the custom exception types by using the following code segments:

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The application includes a function named DoWork that throws .NET Framework exceptions and custom exceptions.

The application contains only the following logging methods:

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The application must meet the following requirements:

-> When AdventureWorksValidationException exceptions are caught, log the information by using the static void Log (AdventureWorksValidationException ex) method.

-> When AdventureWorksDbException or other AdventureWorksException

exceptions are caught, log the information by using the static void I oq( AdventureWorksException ex) method.

You need to meet the requirements.

How should you complete the relevant code? (To answer, drag the appropriate code segments to the correct locations in the answer area. Each code segment may be used once, more than once, or not at all. You may need to drag the split bar between panes or scroll to view content.)

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Answer:

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Question No: 57 – (Topic 1)

You are developing an application that will process orders. The debug and release versions of the application will display different logo images.

You need to ensure that the correct image path is set based on the build configuration. Which code segment should you use?

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  1. Option A

  2. Option B

  3. Option C

  4. Option D

Answer: C Explanation:

There is no such constraint (unless you define one explicitly) RELEASE. http://stackoverflow.com/questions/507704/will-if-release-work-like-if-debug-does-in-c

Question No: 58 DRAG DROP – (Topic 1)

You are developing an application by using C#. The application will process several objects per second.

You need to create a performance counter to analyze the object processing.

Which three actions should you perform in sequence? (To answer, move the appropriate actions from the list of actions to the answer area and arrange them in the correct order.)

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Answer:

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Explanation:

Box 1:

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Box 2:

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Box 3:

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Note: Example:

CounterCreationDataCollection counterDataCollection = new CounterCreationDataCollection(); // Box1

// Add the counter. Box 1

CounterCreationData averageCount64 = new CounterCreationData(); averageCount64.CounterType = PerformanceCounterType.AverageCount64; averageCount64.CounterName = quot;AverageCounter64Samplequot;; counterDataCollection.Add(averageCount64);

// Add the base counter.

CounterCreationData averageCount64Base = new CounterCreationData(); averageCount64Base.CounterType = PerformanceCounterType.AverageBase; averageCount64Base.CounterName = quot;AverageCounter64SampleBasequot;; counterDataCollection.Add(averageCount64Base); // Box 2

// Create the category. Box 3 PerformanceCounterCategory.Create(quot;AverageCounter64SampleCategoryquot;, quot;Demonstrates usage of the AverageCounter64 performance counter type.quot;, PerformanceCounterCategoryType.SingleInstance, counterDataCollection);

Question No: 59 – (Topic 1)

You use the Task.Run() method to launch a long-running data processing operation. The data processing operation often fails in times of heavy network congestion.

If the data processing operation fails, a second operation must clean up any results of the first operation.

You need to ensure that the second operation is invoked only if the data processing operation throws an unhandled exception.

What should you do?

  1. Create a TaskCompletionSourcelt;Tgt; object and call the TrySetException() method of the object.

  2. Create a task by calling the Task.ContinueWith() method.

  3. Examine the Task.Status property immediately after the call to the Task.Run() method.

  4. Create a task inside the existing Task.Run() method by using the AttachedToParent option.

Answer: B

Question No: 60 – (Topic 1)

You use the Task.Run() method to launch a long-running data processing operation. The data processing operation often fails in times of heavy network congestion.

If the data processing operation fails, a second operation must clean up any results of the first operation.

You need to ensure that the second operation is invoked only if the data processing operation throws an unhandled exception.

What should you do?

  1. Create a task within the operation, and set the Task.StartOnError property to true.

  2. Create a TaskFactory object and call the ContinueWhenAll() method of the object.

  3. Create a task by calling the Task.ContinueWith() method.

  4. Use the TaskScheduler class to create a task and call the TryExecuteTask() method on the class.

Answer: C Explanation:

Task.ContinueWith – Creates a continuation that executes asynchronously when the target Task

completes.The returned Task will not be scheduled for execution until the current task has completed, whether it completes due to running to completion successfully, faulting due to an unhandled exception, or exiting out early due to being canceled. http://msdn.microsoft.com/en-us/library/dd270696.aspx

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