DRAG DROP
You are developing an application that includes a class named Kiosk. The Kiosk class includes a static property named Catalog. The Kiosk class is defined by the following code segment. (Line numbers are included for reference only.)

You have the following requirements:
Initialize the _catalog field to a Catalog instance.

Initialize the _catalog field only once.

Ensure that the application code acquires a lock only when the _catalog object must be instantiated.

You need to meet the requirements.
Which three code segments should you insert in sequence at line 09? (To answer, move the appropriate code segments from the list of code segments to the answer area and arrange them in the correct order.) Select and Place:

Correct Answer:

Explanation/Reference:
Explanation:
After taking a lock you must check once again the _catalog field to be sure that other threads didn't instantiated it in the meantime.

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You are creating a console application by using C#. You need to access the application assembly. Which code segment should you use?

• A.Assembly.GetAssembly(this);
• B.This.GetType();
• C.Assembly.Load();
• D.Assembly.GetExecutingAssembly();

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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.)

You need to ensure that Counter2 is available for use in Windows Performance Monitor (PerfMon).
Which code segment should you insert at line 16?

• A.CounterType = PerformanceCounterType.RawBase
• B.CounterType = PerformanceCounterType.AverageBase
• C.CounterType = PerformanceCounterType.SampleBase
• D.CounterType = PerformanceCounterType.CounterMultiBase

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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):

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

• A.Option A
• B.Option B
• C.Option C
• D.Option D

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You are modifying an existing application that manages employee payroll. The application includes a class named PayrollProcessor. The PayrollProcessor class connects to a payroll database and processes batches of paychecks once a week.
You need to ensure that the PayrollProcessor class supports iteration and releases database connections after the batch processing completes.
Which two interfaces should you implement? (Each correct answer presents part of the complete solution.
Choose two.)

• A.IEquatable
• B.IEnumerable
• C.IDisposable
• D.IComparable

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