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Programming in C#

Question No: 171 – (Topic 2)

You are implementing a method named GetValidPhoneNumbers. The GetValidPhoneNumbers() method processes a list of string values that represent phone numbers.

The GetValidPhoneNumbers() method must return only phone numbers that are in a valid format.

You need to implement the GetValidPhoneNumbers() method.

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

1. Option A

2. Option B

3. Option C

4. Option D

Answer: A,B

Explanation: * Regex.Matches

Searches an input string for all occurrences of a regular expression and returns all the matches.

• MatchCollection

  Represents the set of successful matches found by iteratively applying a regular expression pattern to the input string.

  The collection is immutable (read-only) and has no public constructor. The Regex.Matches method returns a MatchCollection object.

• Listlt;Tgt;.Add Method

Adds an object to the end of the Listlt;Tgt;.

Question No: 172 – (Topic 2)

You are developing an application that will process personnel records. The application must encrypt highly sensitive data.

You need to ensure that the application uses the strongest available encryption. Which class should you use?

1. System.Security.Cryptography.DES

2. System.Security.Cryptography.Aes

3. System.Security.Cryptography.TripleDES

4. System.Security.Cryptography.RC2

Answer: B

Question No: 173 – (Topic 2)

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

Loans are restricted to a maximum term of 10 years. The application must send a notification message if a loan request exceeds 10 years.

You need to implement the notification mechanism.

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

1. Option A

2. Option B

3. Option C

4. Option D

Answer: B,D

Question No: 174 – (Topic 2)

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.)

1. IEquatable

2. IEnumerable

3. IDisposable

4. IComparable

Answer: B,C Explanation: IEnumerable IDisposable Interface

Exposes an enumerator, which supports a simple iteration over a non-generic collection.

Defines a method to release allocated resources.

The primary use of this interface is to release unmanaged resources.

Question No: 175 – (Topic 2)

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

You need to ensure that if an exception occurs, the exception will be logged. Which code should you insert at line 28?

1. Option A

2. Option B

3. Option C

4. Option D

Answer: B

Explanation: * XmlWriterTraceListener

Directs tracing or debugging output as XML-encoded data to a TextWriter or to a Stream, such as a FileStream.

* TraceListener.TraceEvent Method (TraceEventCache, String, TraceEventType, Int32) Writes trace and event information to the listener specific output.

Syntax: [ComVisibleAttribute(false)] public virtual void TraceEvent( TraceEventCache eventCache, string source,

TraceEventType eventType, int id

)

Question No: 176 – (Topic 2)

You have the following class (line numbers are included for reference only):

ServiceProxy is a proxy for a web service. Calls to the Update method can take up to five seconds. The Test class is the only class the uses Class1.

You run the Execute method three times, and you receive the following results: 213

312

231

You need to ensure that each value is appended to the Value property in the order that the Modify methods are invoked.

What should you do?

1. Option A

2. Option B

3. Option C

4. Option D

Answer: B

Question No: 177 – (Topic 2)

You are developing an application.

The application contains the following code segment (line numbers are included for reference only):

When you run the code, you receive the following error message: quot;Cannot implicitly convert type #39;object#39;#39; to #39;inf. An explicit conversion exists (are you missing a cast?).quot;

You need to ensure that the code can be compiled. Which code should you use to replace line 05?

1. var2 = ((Listlt;intgt;) array1) [0];

2. var2 = array1[0].Equals(typeof(int));

3. var2 = Convert.ToInt32(array1[0]);

4. var2 = ((int[])array1)[0];

Answer: A

Explanation: Make a list of integers of the array with = ( (Listlt;intgt;)arrayl) then select the first item in the list with [0].

Question No: 178 DRAG DROP – (Topic 2)

You have the following code.

string MessageString = 鈥淭his is the original message!鈥?

You need to store the SHA1 hash value of MessageString in a variable named HashValue.

Which code should you use? Develop the solution by selecting and arranging the required code blocks in the correct order. You may not need all of the code blocks.

Answer:

Explanation:

UnicodeEncode UE = new UnicodeEncoding(); byte[] MessageBytes = UE.GetBytes(MesageString); SHA1Managed SHhash = new SHA1Managed();

byte[] HashValue = SHhash.ComputeHash(MessageBytes);

Question No: 179 – (Topic 2)

You are implementing a method named ProcessFile that retrieves data files from web servers and FTP servers. The ProcessFile () method has the following method signature:

Public void ProcessFile(Guid dataFileld, string dataFileUri)

Each time the ProcessFile() method is called, it must retrieve a unique data file and then save the data file to disk.

You need to complete the implementation of the ProcessFile() method. Which code segment should you use?

1. Option A

2. Option B

3. Option C

4. Option D

   Answer: D

   Explanation: * WebRequest.Create Method (Uri)

   Initializes a new WebRequest instance for the specified URI scheme.

   • Example:

     1. To request data from a host server

        Create a WebRequest instance by calling Create with the URI of the resource. C#

        WebRequest request = WebRequest.Create(quot;http://www.contoso.com/quot;);

     2. Set any property values that you need in the WebRequest. For example, to enable authentication, set the Credentials property to an instance of the NetworkCredential class. C#

        request.Credentials = CredentialCache.DefaultCredentials;

     3. To send the request to the server, call GetResponse. The actual type of the returned

        WebResponse object is determined by the scheme of the requested URI. C#

        WebResponse response = request.GetResponse();

     4. To get the stream containing response data sent by the server, use the GetResponseStream method of the WebResponse.

        C#

        Stream dataStream = response.GetResponseStream ();

        Question No: 180 – (Topic 2)

        You are developing an application that uses a .config file. The relevant portion of the .config file is shown as follows:

        

        You need to ensure that diagnostic data for the application writes to the event log by using the configuration specified in the .config file.

        What should you include in the application code?

        

        1. Option A

        2. Option B

        3. Option C

        4. Option D

Answer: A

Explanation: Explanation

http://msdn.microsoft.com/en-us/library/vstudio/system.diagnostics.eventlogtracelistener Public static void Main(string[] args) {

Create a trace listener for the event log. EventLogTraceListener myTraceListener = new EventLogTraceListener(quot;myEventLogSourcequot;); Add the event log trace listener to the collection. Trace.Listeners.Add(myTraceListener);

// Write output to the event log. Trace.WriteLine(quot;Test outputquot;);

}

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