Beginners Guide: 70 483 programming in c# pdf

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Q101. - (Topic 2) 

You are modifying an existing application. 

The application includes a Loan class and a Customer class. The following code segment defines the classes. 

You populate a collection named customer-Collection with Customer and Loan objects by using the following code segment: 

You create a largeCustomerLoans collection to store the Loan objects by using the following code segment: 

Collection<Loan> largeCustomerLoans = new Collection<Loan>(); 

All loans with an Amount value greater than or equal to 4000 must be tracked. 

You need to populate the largeCustomerLoans collection with Loan objects. 

Which code segment should you use? 

A. Option A 

B. Option B 

C. Option C 

D. Option D 

Answer:

Explanation: Must add to the largeCustomerLoans collection, not the customerLoanCollection. 

We iterate through each customer in customerCollection and check each loan belonging to this customer. 


Q102. DRAG DROP - (Topic 2) 

You are adding a function to a membership tracking application- The function uses an integer named memberCode as an input parameter and returns the membership type as a string. 

The function must meet the following requirements: 

Return "Non-Member" if the memberCode is 0. 

Return "Member" if the memberCode is 1. 

Return "Invalid" if the memberCode is any value other than 0 or 1. 

You need to implement the function to meet the requirements. 

How should you complete the relevant code? (To answer, drag the appropriate statements to the correct locations in the answer area. Each statement 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: 


Q103. HOTSPOT - (Topic 1) 

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 drop-down list in the answer area.) 

Answer: 


Q104. - (Topic 2) 

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 assembly metadata to use the pre-existing public key for the assembly identity by using the AssemblySignatureKeyAttribute attribute. 

B. Disable the strong-name bypass feature of Microsoft .NET Framework in the registry. 

C. Configure the Define DEBUG constant setting in Microsoft Visual Studio. 

D. Decorate the code by using the [assembly:AssemblyDelaySignAttribute(true)] attribute. 

Answer:

Explanation: Use one debug version to connect to the development database, and a standard version to connect to the live database. 


Q105. - (Topic 2) 

You have the following code. (Line numbers are included for reference only). 

You need to complete the WriteTextAsync method. The solution must ensure that the code is not blocked while the file is being written. 

Which code should you insert at line 12? 

A. Option A 

B. Option B 

C. Option C 

D. Option D 

Answer:

Explanation: await sourceStream.WriteAsync(encodedText, 0, encodedText.Length); 

The following example has the statement await sourceStream.WriteAsync(encodedText, 0, 

encodedText.Length);, which is a contraction of the following two statements: 

Task theTask = sourceStream.WriteAsync(encodedText, 0, encodedText.Length); 

await theTask; 

Example: The following example writes text to a file. At each await statement, the method immediately exits. When the file I/O is complete, the method resumes at the statement that follows the await statement. Note that the async modifier is in the definition of methods that use the await statement. 

public async void ProcessWrite() 

string filePath = @"temp2.txt"; 

string text = "Hello World\r\n"; 

await WriteTextAsync(filePath, text); 

private async Task WriteTextAsync(string filePath, string text) 

byte[] encodedText = Encoding.Unicode.GetBytes(text); 

using (FileStream sourceStream = new FileStream(filePath, 

FileMode.Append, FileAccess.Write, FileShare.None, 

bufferSize: 4096, useAsync: true)) 

await sourceStream.WriteAsync(encodedText, 0, encodedText.Length); 

}; 

Reference: Using Async for File Access (C# and Visual Basic) 

https://msdn.microsoft.com/en-us/library/jj155757.aspx 


Q106. - (Topic 1) 

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. RSA 

B. Aes 

C. HMACSHA256 

D. DES 

Answer:


Q107. - (Topic 2) 

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:

Explanation: * 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. 

* List<T>.Add Method Adds an object to the end of the List<T>. Incorrect: Not A: ICollection.SyncRoot Property For collections whose underlying store is not publicly available, the expected implementation is to return the current instance. Note that the pointer to the current instance might not be sufficient for collections that wrap other collections; those should return the underlying collection's SyncRoot property. 


Q108. - (Topic 2) 

You are developing an application that produces an executable named MyApp.exe and an assembly named MyApp.dll. 

The application will be sold to several customers. 

You need to ensure that enough debugging information is available for MyApp.exe, so that if the application throws an error in a customer's environment, you can debug the error in your own development environment. 

What should you do? 

A. Digitally sign MyApp.dll. 

B. Produce program database (PDB) information when you compile the code. 

C. Compile MyApp.exe by using the /unsafe compiler option. 

D. Initializes a new instance of the AssemblyDelaySignAttribute class in the MyApp.dll constructor. 

Answer:


Q109. DRAG DROP - (Topic 1) 

You are implementing a method that creates an instance of a class named User. The User class contains a public event named Renamed. The following code segment defines the Renamed event: 

Public event EventHandler<RenameEventArgs> Renamed; 

You need to create an event handler for the Renamed event by using a lambda expression. 

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: 


Q110. - (Topic 2) 

You have an application that accesses a Web server named Server1. 

You need to download an image named Imagel.jpg from Server1 and store the image locally as Filel.jpg. 

Which code should you use? 

A. Option A 

B. Option B 

C. Option C 

D. Option D 

Answer: