You need to read the entire contents of a file named Message.txt into a single string variable.Which code segment should you use?（）

You are writing an application that uses isolated storage to store user preferences.
The application uses multiple assemblies.
Multiple users will use this application on the same computer.
You need to create a directory named Preferences in the isolated storage area that is scoped to the current Microsoft Windows identity and assembly.
Which code segment should you use?（）

You are creating a class that performs complex financial calculations.
The class contains a method named GetCurrentRate that retrieves the current interest rate and a variable named currRate that stores the current interest rate.
You write serialized representations of the class.
You need to write a code segment that updates the currRate variable with the current interest rate
when an instance of the class is deserialized.
Which code segment should you use?（）

You are writing an application that uses SOAP to exchange data with other applications.
You use a Department class that inherits from ArrayList to send objects to another application.
The Department object is named dept.
You need to ensure that the application serializes the Department object for transport by using SOAP.
Which code should you use?（）