Validated 70-483 Study Guides 2021

NEW QUESTION 1
You are creating an application that reads from a database.
You need to use different databases during the development phase and the testing phase by using conditional compilation techniques.
What should you do?

• A. Configure the Define TRACE constant setting in Microsoft Visual Studio.
• B. Specify the /define compiler option.
• C. Run the Assembly Linker tool from the Windows Software Development Kit (Windows SDK).
• D. Decorate the code by using the [assembly:AssemblyDelaySignAttribute(true)] attribute.

Answer: B

Explanation: You can specify the compiler settings for your application in several ways:
* The property pages
* The command line
* #CONST (for Visual Basic) and #define (for C#)
Note: You can have either the Trace or Debug conditional attribute turned on for a build, or both, or neither. Thus, there are four types of build: Debug, Trace, both, or neither. Some release builds for production deployment might contain neither; most debugging builds contain both.
Incorrect answers:
Not A: TRACE is used to enable tracing. It is not used for conditional compilation. Reference: How to: Compile Conditionally with Trace and Debug https://msdn.microsoft.com/en-us/library/64yxa344(v=vs.110).aspx

NEW QUESTION 2
DRAG DROP
You need to validate whether string strJson is a valid JSON string.

How should you complete the code? To answer, drag the appropriate code elements to the correct targets in the answer area. Each code element 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.

Answer:

Explanation: serializer = new DataContractJsonSerializer();
var result = serializer.ReadObject<Dictionary<string, object>>(StrJson);

NEW QUESTION 3
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?

• A. Create a TaskCompletionSource<T> object and call the TrySetException() method of the object.
• B. Create a task by calling the Task.ContinueWith() method.
• C. Examine the Task.Status property immediately after the call to the Task.Run() method.
• D. Create a task inside the existing Task.Run() method by using the AttachedToParent optio

Answer: B

Explanation: Task.ContinueWith - Creates a continuation that executes asynchronously when the target Task completes.The returned Task will not be scheduled for execution until the current task has completed, whether it completes due to running to completion successfully, faulting due to an unhandled exception, or exiting out early due to being canceled.
http://msdn.microsoft.com/en-us/library/dd270696.aspx

NEW QUESTION 4
You are developing an application that includes methods named ConvertAmount and TransferFunds. You need to ensure that the precision and range of the value in the amount variable is not lost when the TransferFunds() method is called.
Which code segment should you use?

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

Answer: C

Explanation: Simply use float for the TransferFunds parameter. Note:
* The float keyword signifies a simple type that stores 32-bit floating-point values.
* The double keyword signifies a simple type that stores 64-bit floating-point values

NEW QUESTION 5
HOTSPOT
You define a class by using the following code:

To answer, complete each statement according to the information presented in the code.

Answer:

Explanation:

NEW QUESTION 6
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

Answer: B

Explanation: 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

NEW QUESTION 7
You are developing a class named EmployeeRoster. The following code implements the EmployeeRoster class. (Line numbers are included for reference only.)

You create the following unit test method to test the EmployeeRoster class implementation:

You need to ensure that the unit test will pass. What should you do?

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

Answer: B

NEW QUESTION 8
You need to write a method that combines an unknown number of strings. The solution must minimize the amount of memory used by the method when the method executes.
What should you include in the code?

• A. The String.Concat method
• B. The StringBuilder.Append method
• C. The + operator
• D. The += operator

Answer: B

Explanation: StringBuilder is the best method when there are an unknown number of strings. Incorrect:
Not A: Compared to the StringBuilder.Append method, the String.Concat method uses more resources.
String concatenation creates a new string, needing more memory, and is generally considered slow. Not D: += is not used to append strings.

NEW QUESTION 9
HOTSPOT
You have the following C# code. (Line numbers are included for reference only.)

For each of the following statements, select Yes if the statement is true. Otherwise, select False. NOTE: Each correct selection is worth one point.

Answer:

Explanation:

NEW QUESTION 10
DRAG DROP
You need to write code that will display value1, and then value2 in the console. You write the following code:

How should you complete the code? To answer, drag the appropriate code elements to the correct targets. Each code element 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.
NOTE: Each correct selection is worth one point.

Answer:

Explanation: Target 1: string
Target 2: in
Target 3: Split
Target 4: ";"

NEW QUESTION 11
You are developing an application that includes the following code segment. (Line numbers are included for reference only.)

The GetAnimals() method must meet the following requirements: Connect to a Microsoft SQL Server database.
Create Animal objects and populate them with data from the database. Return a sequence of populated Animal objects.
You need to meet the requirements.
Which two actions should you perform? (Each correct answer presents part of the solution. Choose two.)

• A. Insert the following code segment at line 16: while(sqlDataReader.NextResult())
• B. Insert the following code segment at line 13: sqlConnection.Open();
• C. Insert the following code segment at line 13: sqlConnection.BeginTransaction();
• D. Insert the following code segment at line 16: while(sqlDataReader.Read())
• E. Insert the following code segment at line 16: while(sqlDataReader.GetValues())

Answer: BD

Explanation: B: SqlConnection.Open - Opens a database connection with the property settings specified by the ConnectionString.
Reference: http://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqlconnection.open.aspx D: SqlDataReader.Read - Advances the SqlDataReader to the next record. Reference: http://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqldatareader.read.aspx

NEW QUESTION 12
You are developing an application that will read data from a text file and display the file contents. You need to read data from the file, display it, and correctly release the file resources.
Which code segment should you use?

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

Answer: A

Explanation: The StreamReader object must be part of the using statement.

NEW QUESTION 13
DRAG DROP
You are developing a class named ExtensionMethods.
You need to ensure that the ExtensionMethods class implements the IsEmail() method on string objects.
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.)

Answer:

Explanation: Extensions must be in a static class as it kind of a shared source of extension methods. You do not instantiate the class.
The key word “this” is simply a syntax how you tell the compiler, that your method IsUrl is extension for the String object

NEW QUESTION 14
You are troubleshooting an application that uses a class named FullName. The class is decorated with the DataContractAttribute attribute. The application includes the following code. (Line numbers are included for reference only.)

You need to ensure that the entire FullName object is serialized to the memory stream object. Which code segment should you insert at line 09?

• A. binary.WriteEndElement();
• B. binary.NriteEndDocument();
• C. ms.Close() ;
• D. binary.Flush();

Answer: D

Explanation: Example:
MemoryStream stream2 = new MemoryStream();
XmlDictionaryWriter binaryDictionaryWriter = XmlDictionaryWriter.CreateBinaryWriter(stream2); serializer.WriteObject(binaryDictionaryWriter, record1);
binaryDictionaryWriter.Flush(); Incorrect:
Not A: throws InvalidOperationException.
Reference: https://msdn.microsoft.com/en-us/library/ms752244(v=vs.110).aspx

NEW QUESTION 15
You are developing a Windows Forms (WinForms) application. The application displays a TreeView that has 1,000 nodes.
You need to ensure that if a user expands a node, and then collapses the TreeView, the node object is kept in memory unless the Garbage Collector requires additional memory.
Which object should you use to store the node?

• A. GC
• B. Handle
• C. Cache
• D. Wea kReference

Answer: D

Explanation: References: https://msdn.microsoft.com/en-us/library/ms404247.aspx

NEW QUESTION 16
You write the following method (line numbers are included for reference only):

You need to ensure that the method extracts a list of URLs that match the following pattern:
@http://(www.)?([^.]+).com;
Which code should you insert at line 07?

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

Answer: A

Explanation: The MatchCollection.GetEnumerator method returns an enumerator that iterates through a collection.
Note:
The MatchCollection Class represents the set of successful matches found by iteratively applying a regular expression pattern to the input string.
Incorrect:
Not B: The ICollection.SyncRoot property gets an object that can be used to synchronize access to the ICollection.
Reference: MatchCollection.GetEnumerator Method https://msdn.microsoft.com/enus/ library/system.text.regularexpressions.matchcollection.getenumerator(v=vs.110).aspx

NEW QUESTION 17
You are creating a class library that will be used in a web application. You need to ensure that the class library assembly is strongly named. What should you do?

• A. Use the gacutil.exe command-line tool.
• B. Use the xsd.exe command-line tool.
• C. Use the aspnet_regiis.exe command-line tool.
• D. Use assembly attributes.

Answer: D

Explanation: The Windows Software Development Kit (SDK) provides several ways to sign an assembly with a strong name:
* Using the Assembly Linker (Al.exe) provided by the Windows SDK.
* Using assembly attributes to insert the strong name information in your code. You can use either the AssemblyKeyFileAttribute or the AssemblyKeyNameAttribute, depending on where the key file to be used is located.
* Using compiler options such /keyfile or /delaysign in C# and Visual Basic, or the /KEYFILE or
/DELAYSIGN linker option in C++. (For information on delay signing, see Delay Signing an Assembly.)

NEW QUESTION 18
DRAG DROP
You have an application that contains the following class definitions.

You need to ensure that the Customers class can be initialized by using the following code.

Which code should you add to the application? To answer, drag the appropriate values to the correct targets. Each value 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.
NOTE: Each correct selection is worth one point.

Answer:

Explanation: Target 1: AddCustomer
Target 2: AddItem