You are developing a class named Account that will be used by several applications.
The applications that will consume the Account class will make asynchronous calls to the Account class to
execute several different methods.
You need to ensure that only one call to the methods is executed at a time.
Which keyword should you use?

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.)

You are developing an application that uses several objects. The application includes the following code
segment. (Line numbers are included for reference only.)

You need to evaluate whether an object is null.
Which code segment should you insert at line 03?

You have the following code:

You need to retrieve all of the numbers from the items variable that are greater than 80.
Which code should you use?

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?

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?

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?

You are developing an assembly.
You plan to sign the assembly when the assembly is developed.
You need to reserve space in the assembly for the signature.
What should you do?

You are developing a C# application. The application references and calls a RESTful web service named
EmployeeService. The EmployeeService web service includes a method named GetEmployee, which accepts
an employee ID as a parameter. The web service returns the following JSON data from the method.
{“Id”:1,”Name”:”David Jones”>
The following code segment invokes the service and stores the result:

You need to convert the returned JSON data to an Employee object for use in the application.
Which code segment should you use?

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?