HOTSPOT
You are implementing a library method that accepts a character parameter and returns a string.
If the lookup succeeds, the method must return the corresponding string value. If the lookup fails,
the method must return the value “invalid choice.”
You need to implement the lookup algorithm.
How should you complete the relevant code? (To answer, select the correct keyword in each dropdown list in the answer area.)

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?

You are modifying an application that processes leases. The following code defines the Lease class.
(Line numbers are included for reference only.)

Leases are restricted to a maximum term of 5 years. The application must send a notification
message if a lease request exceeds 5 years.
You need to implement the notification mechanism.
Which two actions should you perform? (Each correct answer presents part of the solution. Choose
two.)

You are developing an application that uses structured exception handling. The application includes
a class named ExceptionLogger.
The ExceptionLogger class implements a method named LogException by using the following code
segment:
public static void LogException(Exception ex)
You have the following requirements:
Log all exceptions by using the LogException() method of the ExceptionLogger class.
Rethrow the original exception, including the entire exception stack.
You need to meet the requirements.
Which code segment should you use?

You are developing an application that includes a class named UserTracker. The application includes
the following code segment. (Line numbers are included for reference only.)

You need to add a user to the UserTracker instance.
What should you do?

DRAG DROP

You develop an application that displays information from log files when errors occur. The
application will prompt the user to create an error report that sends details about the error and the
session to the administrator.
When a user opens a log file by using the application, the application throws an exception and
closes.
The application must preserve the original stack trace information when an exception occurs during
this process.
You need to implement the method that reads the log files.
How should you complete the relevant code? (To answer, drag the appropriate code segments to
the correct locations in the answer are
a. 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.)

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.)

DRAG DROP
You are developing an application that will include a method named GetDat
a. The GetData() method will retrieve several lines of data from a web service by using a
System.IO.StreamReader object.
You have the following requirements:
The GetData() method must return a string value that contains the first line of the response from the
web service.
The application must remain responsive while the GetData() method runs.
You need to implement the GetData() method.

How should you complete the relevant code? (To answer, drag the appropriate objects to the
correct locations in the answer area. Each object 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.)

You are adding a public method named UpdateScore to a public class named ScoreCard.
The code region that updates the score field must meet the following requirements:
It must be accessed by only one thread at a time.
It must not be vulnerable to a deadlock situation.
You need to implement the UpdateScore() method.
What should you do?

DRAG DROP
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:

The application includes a function named DoWork that throws .NET Framework exceptions and
custom exceptions.
The application contains only the following logging methods:

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 are
a. 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.)