70-483: Programming in C#

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 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.)

Correct answer: To work with this question, an Exam Simulator is required.

Explanation:

StringReader - Implements a TextReader that reads from a string. StreamReader - Implements a TextReader that reads characters from a byte stream in a particular encoding. Once an exception is thrown, part of the information it carries is the stack trace. The stack trace is a list of the method call hierarchy that starts with the method that throws the exception and ends with the method that catches the exception. If an exception is re-thrown by specifying the exception in the throw statement, the stack trace is restarted at the current method and the list of method calls between the original method that threw the exception and the current method is lost. To keep the original stack trace information with the exception, use the throw statement without specifying the exception. References: http://msdn.microsoft.com/en-us/library/system.io.stringreader(v=vs.110).aspxhttp://msdn.microsoft.com/en-us/library/system.io.streamreader(v=vs.110).aspxhttp://msdn.microsoft.com/en-us/library/ms182363(v=vs.110).aspx

StringReader - Implements a TextReader that reads from a string.

StreamReader - Implements a TextReader that reads characters from a byte stream in a particular encoding.

Once an exception is thrown, part of the information it carries is the stack trace. The stack trace is a list of the method call hierarchy that starts with the method that throws the exception and ends with the method that catches the exception. If an exception is re-thrown by specifying the exception in the throw statement, the stack trace is restarted at the current method and the list of method calls between the original method that threw the exception and the current method is lost. To keep the original stack trace information with the exception, use the throw statement without specifying the exception.

References:

http://msdn.microsoft.com/en-us/library/system.io.stringreader(v=vs.110).aspx

http://msdn.microsoft.com/en-us/library/system.io.streamreader(v=vs.110).aspx

http://msdn.microsoft.com/en-us/library/ms182363(v=vs.110).aspx

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.)

Correct answer: To work with this question, an Exam Simulator is required.

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.

You are developing an application that will include a method named GetData. 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.)

Correct answer: To work with this question, an Exam Simulator is required.

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?

Option A
Option B
Option C
Option D

Correct answer: B

Explanation:

References: http://blogs.msdn.com/b/bclteam/archive/2004/01/20/60719.aspx

You are developing a C# application that has a requirement to validate some string input data by using the Regex class.

The application includes a method named ContainsHyperlink. The ContainsHyperlink() method will verify the presence of a URI and surrounding markup.

The following code segment defines the ContainsHyperlink() method. (Line numbers are included for reference only.)

The expression patterns used for each validation function are constant.

You need to ensure that the expression syntax is evaluated only once when the Regex object is initially instantiated.

Which code segment should you insert at line 04?

Correct answer: D

Explanation:

RegexOptions.Compiled - Specifies that the regular expression is compiled to an assembly. This yields faster execution but increases startup time. This value should not be assigned to the Options property when calling the CompileToAssembly method. References:http://msdn.microsoft.com/en-us/library/system.text.regularexpressions.regexoptions.aspxhttp://stackoverflow.com/questions/513412/how-does-regexoptions-compiled-work

RegexOptions.Compiled - Specifies that the regular expression is compiled to an assembly. This yields faster execution but increases startup time. This value should not be assigned to the Options property when calling the CompileToAssembly method.

References:

http://msdn.microsoft.com/en-us/library/system.text.regularexpressions.regexoptions.aspx

http://stackoverflow.com/questions/513412/how-does-regexoptions-compiled-work

You are developing an application by using C#.

You have the following requirements:

Support 32-bit and 64-bit system configurations.
Include pre-processor directives that are specific to the system configuration.
Deploy an application version that includes both system configurations to testers.
Ensure that stack traces include accurate line numbers.

You need to configure the project to avoid changing individual configuration settings every time you deploy the application to testers.

Which two actions should you perform? (Each correct answer presents part of the solution. Choose two.)

Update the platform target and conditional compilation symbols for each application configuration.
Create two application configurations based on the default Release configuration.
Optimize the application through address rebasing in the 64-bit configuration.
Create two application configurations based on the default Debug configuration.

Correct answer: BD

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 Counter1 is available for use in Windows Performance Monitor (PerfMon).

Which code segment should you insert at line 16?

CounterType = PerformanccCounterType.RawBase
CounterType = PerformanceCounterType.AverageBase
CounterType = PerformanceCounterType.SampleBase
CounterType = PerformanceCounterType.CounterMultiBase

Correct 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 %.References: http://msdn.microsoft.com/en-us/library/system.diagnostics.performancecountertype.aspx

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 %.

References: http://msdn.microsoft.com/en-us/library/system.diagnostics.performancecountertype.aspx

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?

HMACSHA256
RNGCryptoServiceProvider
DES
Aes

Correct answer: A

Explanation:

The .NET Framework provides the following classes that implement hashing algorithms:HMACSHA1. MACTripleDES. MD5CryptoServiceProvider. RIPEMD160. SHA1Managed. SHA256Managed. SHA384Managed. SHA512Managed. HMAC variants of all of the Secure Hash Algorithm (SHA), Message Digest 5 (MD5), and RIPEMD-160 algorithms. CryptoServiceProvider implementations (managed code wrappers) of all the SHA algorithms. Cryptography Next Generation (CNG) implementations of all the MD5 and SHA algorithms. http://msdn.microsoft.com/en-us/library/92f9ye3s.aspx#hash_values

The .NET Framework provides the following classes that implement hashing algorithms:

HMACSHA1.
MACTripleDES.
MD5CryptoServiceProvider.
RIPEMD160.
SHA1Managed.
SHA256Managed.
SHA384Managed.
SHA512Managed.

HMAC variants of all of the Secure Hash Algorithm (SHA), Message Digest 5 (MD5), and RIPEMD-160 algorithms.

CryptoServiceProvider implementations (managed code wrappers) of all the SHA algorithms.

Cryptography Next Generation (CNG) implementations of all the MD5 and SHA algorithms.

http://msdn.microsoft.com/en-us/library/92f9ye3s.aspx#hash_values

You are testing an application. The application includes methods named CalculateInterest and LogLine. The CalculateInterest() method calculates loan interest. The LogLine() method sends diagnostic messages to a console window.

You have the following requirements:

The CalculateInterest() method must run for all build configurations.
The LogLine() method must be called only for debug builds.

You need to ensure that the methods run correctly.

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.)

Correct answer: To work with this question, an Exam Simulator is required.

You are developing an assembly that will be used by multiple applications.

You need to install the assembly in the Global Assembly Cache (GAC).

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

Use the Assembly Registration tool (regasm.exe) to register the assembly and to copy the assembly to the GAC.
Use the Strong Name tool (sn.exe) to copy the assembly into the GAC.
Use Microsoft Register Server (regsvr32.exe) to add the assembly to the GAC.
Use the Global Assembly Cache tool (gacutil.exe) to add the assembly to the GAC.
Use Windows Installer 2.0 to add the assembly to the GAC.

Correct answer: DE

Explanation:

There are two ways to deploy an assembly into the global assembly cache:Use an installer designed to work with the global assembly cache. This is the preferred option for installing assemblies into the global assembly cache. Use a developer tool called the Global Assembly Cache tool (Gacutil.exe), provided by the Windows Software Development Kit (SDK). Note:In deployment scenarios, use Windows Installer 2.0 to install assemblies into the global assembly cache. Use the Global Assembly Cache tool only in development scenarios, because it does not provide assembly reference counting and other features provided when using the Windows Installer. References: http://msdn.microsoft.com/en-us/library/yf1d93sz%28v=vs.110%29.aspx

There are two ways to deploy an assembly into the global assembly cache:

Use an installer designed to work with the global assembly cache. This is the preferred option for installing assemblies into the global assembly cache.

Use a developer tool called the Global Assembly Cache tool (Gacutil.exe), provided by the Windows

Software Development Kit (SDK).

Note:

In deployment scenarios, use Windows Installer 2.0 to install assemblies into the global assembly cache. Use the Global Assembly Cache tool only in development scenarios, because it does not provide assembly reference counting and other features provided when using the Windows Installer.

References: http://msdn.microsoft.com/en-us/library/yf1d93sz%28v=vs.110%29.aspx

Vendor:	Microsoft
Exam Code:	70-483
Exam Name:	Programming in C#
Date:	Aug 26, 2018
File Size:	26 MB

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