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Exam Code: exam 70 483 dumps (Practice Exam Latest Test Questions VCE PDF)
Exam Name: Programming in C#
Certification Provider: Microsoft
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Q91. DRAG DROP – (Topic 1) 

You are developing an application by using C#. The application will process several objects per second. 

You need to create a performance counter to analyze the object processing. 

Which three actions should you perform in sequence? (To answer, move the appropriate actions from the list of actions to the answer area and arrange them in the correct order.) 

Answer: 

Q92. – (Topic 2) 

You are implementing a new method named ProcessData. The ProcessData() method calls a third-party component that performs a long-running operation to retrieve stock information from a web service. 

The third-party component uses the IAsyncResult pattern to signal completion of the long-running operation so that the UI can be updated with the new values. 

You need to ensure that the calling code handles the long-running operation as a System.Threading.Tasks.Task object to avoid blocking the UI thread. 

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

A. Create a TaskCompletionSource<T> object. 

B. Call the component by using the TaskFactory.FromAsync() method. 

C. Apply the following attribute to the ProcessData() method signature: [Methodlmpl(MethodlmplOptions.Synchronized)] 

D. Apply the async modifier to the ProcessData() method signature. 

Answer: A,B 

Explanation: A: In many scenarios, it is useful to enable a Task<TResult> to represent an external asynchronous operation. TaskCompletionSource<TResult> is provided for this purpose. It enables the creation of a task that can be handed out to consumers, and those consumers can use the members of the task as they would any other. However, unlike most tasks, the state of a task created by a TaskCompletionSource is controlled explicitly by the methods on TaskCompletionSource. This enables the completion of the external asynchronous operation to be propagated to the underlying Task. The separation also ensures that consumers are not able to transition the state without access to the corresponding TaskCompletionSource. 

B: TaskFactory.FromAsync Method 

Creates a Task that represents a pair of begin and end methods that conform to the 

Asynchronous Programming Model pattern. Overloaded. 

Example: 

TaskFactory.FromAsync Method (IAsyncResult, Action<IAsyncResult>) 

Creates a Task that executes an end method action when a specified IAsyncResult completes. 

Note: 

* System.Threading.Tasks.Task Represents an asynchronous operation. 

Q93. HOTSPOT – (Topic 2) 

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

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

Answer: 

Q94. – (Topic 1) 

You are developing an application that includes a class named Order. The application will store a collection of Order objects. 

The collection must meet the following requirements: 

Use strongly typed members. 

Process Order objects in first-in-first-out order. 

Store values for each Order object. 

. Use zero-based indices. 

You need to use a collection type that meets the requirements. 

Which collection type should you use? 

A. Queue<T> 

B. SortedList 

C. LinkedList<T> 

D. HashTable 

E. Array<T> 

Answer:

Explanation: 

Queues are useful for storing messages in the order they were received for sequential processing. Objects stored in a Queue<T> are inserted at one end and removed from the other. http://msdn.microsoft.com/en-us/library/7977ey2c.aspx 

Q95. – (Topic 2) 

You are implementing a new method named ProcessData. The ProcessData() method calls a third-party component that performs a long-running operation. 

The third-party component uses the IAsyncResult pattern to signal completion of the long-running operation. 

You need to ensure that the calling code handles the long-running operation as a System.Threading.Tasks.Task object. 

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

A. Call the component by using the TaskFactory.FromAsync() method. 

B. Create a TaskCompletionSource<T> object. 

C. Apply the async modifier to the method signature. 

D. Apply the following attribute to the method signature: [MethodImpl(MethodImplOptions.Synchronized)] 

Answer: A,B 

Explanation: A: TaskFactory.FromAsync Method 

Creates a Task that represents a pair of begin and end methods that conform to the 

Asynchronous Programming Model pattern. Overloaded. 

Example: 

TaskFactory.FromAsync Method (IAsyncResult, Action<IAsyncResult>) 

Creates a Task that executes an end method action when a specified IAsyncResult 

completes. 

B: In many scenarios, it is useful to enable a Task<TResult> to represent an external asynchronous operation. TaskCompletionSource<TResult> is provided for this purpose. It enables the creation of a task that can be handed out to consumers, and those consumers can use the members of the task as they would any other. However, unlike most tasks, the state of a task created by a TaskCompletionSource is controlled explicitly by the methods on TaskCompletionSource. This enables the completion of the external asynchronous operation to be propagated to the underlying Task. The separation also ensures that consumers are not able to transition the state without access to the corresponding TaskCompletionSource. 

Note: 

* System.Threading.Tasks.Task Represents an asynchronous operation. 

Q96. – (Topic 2) 

You need to write a console application that meets the following requirements: 

. If the application is compiled in Debug mode, the console output must display Entering debug mode. . If the application is compiled in Release mode, the console output must display Entering release mode. 

Which code should you use? 

A. Option A 

B. Option B 

C. Option C 

D. Option D 

Answer:

Explanation: When the C# compiler encounters an #if directive, followed eventually by an #endif directive, it will compile the code between the directives only if the specified symbol is defined. Unlike C and C++, you cannot assign a numeric value to a symbol; the #if statement in C# is Boolean and only tests whether the symbol has been defined or not. For example, #define DEBUG // … #if DEBUG Console.WriteLine("Debug version"); #endif 

Q97. – (Topic 2) 

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. DbDataAdapter 

B. unTyped DataSet 

C. OleDbDataAdapter 

D. DbDataReader 

Answer:

Explanation: The DbDataReader class reads a forward-only stream of rows from a data source. 

Reference: DbDataReader Class 

https://msdn.microsoft.com/en-us/library/system.data.common.dbdatareader(v=vs.110).aspx 

Q98. – (Topic 1) 

You are creating an application that manages information about your company's products. The application includes a class named Product and a method named Save. 

The Save() method must be strongly typed. It must allow only types inherited from the Product class that use a constructor that accepts no parameters. 

You need to implement the Save() method. Which code segment should you use? 

A. Option A 

B. Option B 

C. Option C 

D. Option D 

Answer:

Explanation: 

When you define a generic class, you can apply restrictions to the kinds of types that client 

code can use for type arguments when it instantiates your class. If client code tries to instantiate your class by using a type that is not allowed by a constraint, the result is a compile-time error. These restrictions are called constraints. Constraints are specified by using the where contextual keyword. http://msdn.microsoft.com/en-us/library/d5x73970.aspx 

Q99. – (Topic 2) 

You are developing an application that contains a class named TheaterCustomer and a method named ProcessTheaterCustomer. The ProcessTheaterCustomer() method accepts a TheaterCustomer object as the input parameter. 

You have the following requirements: 

. Store the TheaterCustomer objects in a collection. 

. Ensure that the ProcessTheaterCustomer() method processes the TheaterCustomer objects in the reverse order in which they are placed into the collection. 

You need to meet the requirements. 

What should you do? 

A. Create a System.Collections.Queue collection. Use the Enqueue() method to add TheaterCustomer objects to the collection. Use the Dequeue() method to pass the objects to the ProcessTheaterCustomer() method. 

B. Create a System.Collections.ArrayList collection. Use the Insert() method to add TheaterCustomer objects to the collection. Use the Remove() method to pass the objects to the ProcessTheaterCustomer() method. 

C. Create a System.Collections.Stack collection. Use the Push() method to add TheaterCustomer objects to the collection. Use the Pop() method to pass the objects to the ProcessTheaterCustomer() method. 

D. Create a System.Collections.Queue collection. Use the Enqueue() method to add TheaterCustomer objects to the collection. Use the Peek() method to pass the objects to the ProcessTheaterCustomer() method. 

Answer:

Explanation: A stack is the appropriate collection here. In computer science, a stack or LIFO (last in, first out) is an abstract data type that serves as a collection of elements, with two principal operations: push, which adds an element to the collection, and pop, which removes the last element that was added. 

Reference: https://en.wikipedia.org/wiki/Stack_(abstract_data_type) 

Q100. – (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 D: 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. 

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