You work as the developer in an IT company. Recently your company has a big customer. The customer runs a large supermarket chain. You're appointed to provide technical support for the customer. Now according to the customer requirement, you are creating an application. Custom authentication and role-based security will be used by the application. In order to make the runtime assign an unauthenticated principal object to each running thread, you have to write a code segment. In the options below, which code segment should you use?

• A. AppDomain domain = AppDomain.CurrentDomain;domain.SetPrincipalPolicy(PrincipalPolicy.WindowsPrincipal);
• B. AppDomain domain = AppDomain.CurrentDomain;domain.SetThreadPrincipal(new WindowsPrincipal(null));
• C. AppDomain domain = AppDomain.CurrentDomain;domain.SetPrincipalPolicy( PrincipalPolicy.UnauthenticatedPrincipal);
• D. AppDomain domain = AppDomain.CurrentDomain; domain.SetAppDomainPolicy( PolicyLevel.CreateAppDomainLevel());

You have just graduated from college, now you are serving the internship as the software developer in an international company. According to the requirements of the company CIO, you are creating a class. The class uses unmanaged resources and maintains references to managed resources on other objects. You must make sure that when the class instance cease to be needed, users of this class can explicitly release resources. what should you do? (choose more than one)

• A. You should create a Dispose method that releases unmanaged resources and calls methods on other objects to release the managed resources.
• B. You should define the class such that it inherits from the WeakReference class.
• C. You should create a class destructor that releases the unmanaged resources.
• D. You should create a Dispose method that calls System.GC.Collect to force garbage collection.
• E. You should define the class such that it implements the IDisposable interface.
• F. You should create a class destructor that calls methods on other objects to release the managed resources.

You have just graduated from college, now you are serving the internship as the software developer in an international company. According to the requirements of the company CIO, you create a personalized home page. You plan to enable users to choose from a selection of daily headlines from different news providers. You create a series of custom user controls each of which points to a different news provider. You have to add these controls to the personalized home page. What should you do?

• A. The controls should be added to a WebPartZone.
• B. The controls should be added to a CatalogZone.
• C. The controls should be added to a PageCatalogPart.
• D. The controls should be added to a WebPartManager.

You have just graduated from college, now you are serving the internship as the software
developer in an international company. There's an SQL query that takes one minute to execute. You execute the SQL query asynchronously by using the following code:
Dim ar As IAsyncResult = cmd.BeginExecuteReader()
When you're executing the SQL query is executing, you have to execute a method named DoWork(). It takes one second for the method to execute. When the SQL query is executing, DoWork() must run as many times as possible.
In the options below, which code segment should you use?

• A. While Not ar.AsyncWaitHandle.WaitOne() DoWork()End Whiledr = cmd.EndExecuteReader(ar)
• B. While Thread.CurrentThread.ThreadState = ThreadState.Running DoWork()End Whiledr = cmd.EndExecuteReader(ar)
• C. While ar.AsyncWaitHandle Is Nothing DoWork()End Whiledr = cmd.EndExecuteReader(ar)
• D. While Not ar.IsCompleted DoWork()End Whiledr = cmd.EndExecuteReader(ar)