MCTS Application Development & Programming 3

Question 1

Which design pattern ensures a class has only one instance and provides a global access point to it?

Accepted Answer

Singleton

Answer

The Singleton pattern restricts instantiation of a class to one object and provides a static method to access that instance.

Question 2

In C#, what is boxing?

Accepted Answer

Converting a value type to an object reference type

Answer

Boxing is the implicit conversion of a value type (like int) to type object, which allocates heap memory for the value.

Question 3

Which WCF binding is most appropriate for communication between two .NET applications on the same machine?

Accepted Answer

NetNamedPipeBinding

Answer

NetNamedPipeBinding uses named pipes for inter-process communication on the same machine, offering the best performance in that scenario.

Question 4

In LINQ, what does the 'deferred execution' concept mean?

Accepted Answer

The query is executed only when results are iterated

Answer

LINQ queries with deferred execution are not evaluated until the query variable is iterated, enabling dynamic composition.

Question 5

Which ASP.NET mechanism allows you to store user-specific data across multiple requests without a database?

Accepted Answer

Session State

Answer

Session State stores per-user data server-side and associates it with the user's browser session via a session ID cookie.

(MCTS) Microsoft Certified Technology Specialist Practice Test