Microsoft 70-483 Online Practice Questions and Exam Preparation

Microsoft 70-483 Online Questions & Answers

• Question 131:

  You are developing an application by using C#.

  The application includes an object that performs a long running process.

  You need to ensure that the garbage collector does not release the object's resources until the process completes. Which garbage collector method should you use?

  A. WaitForFullGCComplete()
  B. WaitForFullGCApproach()
  C. KeepAlive()
  D. WaitForPendingFinalizers()
  C. KeepAlive()

  ---

  The GC.KeepAlive method references the specified object, which makes it ineligible for garbage collection from the start of the current routine to the point where this method is called.

  The purpose of the KeepAlive method is to ensure the existence of a reference to an object that is at risk of being prematurely reclaimed by the garbage collector. The KeepAlive method performs no operation and produces no side effects

  other than extending the lifetime of the object passed in as a parameter.

  Reference: GC.KeepAlive Method (Object)

  https://msdn.microsoft.com/en-us/library/system.gc.keepalive(v=vs.110).aspx

• Question 132:

  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?

  A. HMACSHA256
  B. RNGCryptoServiceProvider
  C. DES
  D. Aes
  A. HMACSHA256

  ---

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

• Question 133:

  You are creating an assembly named Assembly1 by using the Class Library project template in Microsoft Visual Studio. Assembly1 is used by a C# application named App1.

  You do not have access to the Visual Studio project for App1.

  You need to ensure that you can debug Assembly1.

  What should you configure in the project properties?

  A. On the Application page, set the Output type to Windows Application.
  B. On the Build page, click Allow unsafe code.
  C. On the Debug page, set the Start external program option for App1.
  D. On the Debug page, click Enable native code debugging.
  C. On the Debug page, set the Start external program option for App1.

  ---

  Reference: https://msdn.microsoft.com/en-us/library/2wcdezs5.aspx

• Question 134:

  You are developing an application that will convert data into multiple output formats.

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

  

  You are developing a code segment that will produce tab-delimited output. All output routines implement the following interface:

  

  You need to minimize the completion time of the GetOutput() method. Which code segment should you insert at line 06?

  

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

  ---

  A String object concatenation operation always creates a new object from the existing string and the new data. A StringBuilder object maintains a buffer to accommodate the concatenation of new data. New data is appended to the buffer if room is available; otherwise, a new, larger buffer is allocated, data from the original buffer is copied to the new buffer, and the new data is then appended to the new buffer. The performance of a concatenation operation for a String or StringBuilder object depends on the frequency of memory allocations. A String concatenation operation always allocates memory, whereas a StringBuilder concatenation operation allocates memory only if the StringBuilder object buffer is too small to accommodate the new data. Use the String class if you are concatenating a fixed number of String objects. In that case, the compiler may even combine individual concatenation operations into a single operation. Use a StringBuilder object if you are concatenating an arbitrary number of strings; for example, if you're using a loop to concatenate a random number of strings of user input. http:// msdn.microsoft.com/en-us/library/system.text.stringbuilder(v=vs.110).aspx

• Question 135:

  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?

  

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

  ---

  * XmlWriterTraceListener

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

• Question 136:

  You need to write a method that retrieves data from a Microsoft Access 2013 database.

  The method must meet the following requirements:

  Be read-only.

  Be able to use the data before the entire data set is retrieved. Minimize the amount of system overhead and the amount of memory usage.

  Which type of object should you use in the method?

  A. SqlDataAdapter
  B. DataContext
  C. DbDataAdapter
  D. OleDbDataReader
  D. OleDbDataReader

  ---

  OleDbDataReader Class

  Provides a way of reading a forward-only stream of data rows from a data source.

  Example:

  OleDbConnection cn = new OleDbConnection();

  OleDbCommand cmd = new OleDbCommand();

  DataTable schemaTable;

  OleDbDataReader myReader;

  //Open a connection to the SQL Server Northwind database. cn.ConnectionString = "Provider=SQLOLEDB;Data Source=server;User ID=login; Password=password;Initial Catalog=Northwind";

• Question 137:

  You are creating a console application named App1.

  App1 will validate user input for order entries. You are developing the following code segment (line numbers are included for reference only):

  

  You need to complete the code segment.

  The solution must ensure that prices are positive and have two decimal places.

  Which code should you insert at line 03?

  

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

  ---

  ^\d+(.\d\d)?$ only allows positive numbers.

  Incorrect:

  ^(-)?\d+(.\d\d)?$ allows for negative numbers because of the (-) group

• Question 138:

  HOTSPOT

  You have the following code:

  

  For each of the following statements, select Yes if the statement is true. Otherwise, select No.

  Hot Area:

  

  

• Question 139:

  You are creating a console application named Appl.

  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
  B. Option B

  ---

  JavaScriptSerializer().Deserialize

  Converts the specified JSON string to an object of type T.

  Example:

  string json = File.ReadAllText(Environment.CurrentDirectory + @"\JSON.txt");

  Company company = new

  System.Web.Script.Serialization.JavaScriptSerializer().Deserialize(

  Reference: C# - serialize object to JSON format using JavaScriptSerializer

  http://matijabozicevic.com/blog/csharp-net-development/csharp-serialize-object-to-json- format-using-javascriptserialization

• Question 140:

  You are developing an application by using C#. You provide a public key to the development team during development.

  You need to specify that the assembly is not fully signed when it is built.

  Which two assembly attributes should you include in the source code? (Each correct answer presents part of the solution. Choose two.)

  A. AssemblyKeyNameAttribute
  B. ObfuscateAssemblyAttribute
  C. AssemblyDelaySignAttribute
  D. AssemblyKeyFileAttribute
  C. AssemblyDelaySignAttribute
  D. AssemblyKeyFileAttribute

  ---

  *

  AssemblyDelaySignAttribute

  Specifies that the assembly is not fully signed when created.

  *

  The following code example shows the use of the AssemblyDelaySignAttribute attribute with the AssemblyKeyFileAttribute.

  using System;

  using System.Reflection;

  [assembly:AssemblyKeyFileAttribute("TestPublicKey.snk")] [assembly:AssemblyDelaySignAttribute(true)]

  namespace DelaySign

  {

  public class Test { }

  }

  Reference: http://msdn.microsoft.com/en-us/library/t07a3dye(v=vs.110).aspx