70-316 Developing and Implementing Windows-based Applications with Microsoft Visual C# .NET Practice Tests

Demo Question 4.

You are the .Net Consultant for CKBank. CKBank wants to allow existing users of their ATM machines to apply for Internet Banking through their ATM machines. To do this, you use Visual Studio .NET to create a component named ValidateValidATMUser to verify if the user is a valid ATM customer. This component includes a method named AcceptValidateValidATMUser, which tries to process new user ValidateValidATMUsers for services. AcceptValidateValidATMUser calls a private function named Validate. You must ensure that any exceptions encountered by Validate are bubbled up to the parent form of ValidateValidATMUser. The parent form will then be responsible for handling the exceptions. You want to accomplish this goal by writing the minimum amount of code. What should you do?

A. Use the following code segment in AcceptValidateValidATMUser: Me.Validate()
B. Use the following code segment in AcceptValidateValidATMUser: Try { Me.Validate() } Catch Exception ex { Throw ex }
C. Use the following code segment in AcceptValidateValidATMUser: Try { Me.Validate() } Catch Exception ex { Throw new Exception ("Exception in AcceptValidateValidATMUser", ex) }
D. Create a customer Exception class named ValidateValidATMUserException by the following code segment: Public Class ValidateValidATMUserException Inherits System.ApplicationException Public New(){ } Public New (String message){ MyBase.New(message) } Public New (String message, Exception inner){ MyBase.New(message, inner) } } In addition, use the following code segment in AcceptValidateValidATMUser: Try { Catch Exception ex { Throw new ValidateValidATMUserException("Exception in _ AcceptValidateValidATMUser", ex); }


Display Answer

Answer: B The unhandled exception automatically will be thrown to the client application. This solution meets the requirement that the least amount of code should be used. We must throw the exception as it is.

Explanation: