MCQs on Advanced Error Handling | Visual Basic .NET (VB.NET)
Enhance your VB.NET expertise with 30 advanced multiple-choice questions on error handling, custom exception classes, logging errors, and global exception handling. Perfect for developers seeking to master error management techniques.
Advanced Error Handling
- What is the purpose of error handling in VB.NET?
- Which statement is used to catch exceptions in VB.NET?
- What type of errors does the
Try...Catch...Finallyblock handle? - How can you re-throw an exception after it’s been caught in VB.NET?
- Which of the following is used for creating custom error messages in VB.NET?
- How does the
Finallyblock behave in exception handling? - What type of exception handling model does VB.NET use?
- What is the purpose of the
Throwstatement in error handling? - How can multiple exceptions be handled in a single
Catchblock? - Which exception class is the base class for all exceptions in VB.NET?
Custom Exception Classes
- How do you create a custom exception class in VB.NET?
- Which keyword is used to define a custom exception class in VB.NET?
- When should you use custom exceptions in your application?
- What is the purpose of overriding the
Messageproperty in a custom exception class? - How can custom exception classes enhance error handling in complex applications?
- What is the minimum required constructor for a custom exception class in VB.NET?
- Which base class does a custom exception class inherit from in VB.NET?
- How can a custom exception class be thrown in VB.NET?
- How do you access the inner exception in a custom exception class?
- Which method is typically overridden when defining custom exception behavior?
Logging Errors
- What is the primary purpose of logging errors in VB.NET?
- Which library can be used for logging errors in VB.NET applications?
- What does the
EventLogclass in VB.NET do? - How can you log error details to a file in VB.NET?
- What is the benefit of logging error messages instead of just displaying them to the user?
- Which logging level is typically used to log critical errors?
- What is the role of a
Loggerclass in error logging? - What should be logged when an exception occurs in a VB.NET application?
Global Exception Handling
- Which method is used to handle unhandled exceptions globally in a VB.NET application?
- How can you enable global exception handling in a Windows Forms application?
Answers
| Qno | Answer (Option with the text) |
|---|---|
| 1 | Error handling allows the program to recover from unexpected situations, ensuring smooth operation and preventing crashes. |
| 2 | Catch |
| 3 | Runtime errors or exceptions |
| 4 | Throw |
| 5 | Throw New Exception("Your message here") |
| 6 | The Finally block runs regardless of whether an exception was thrown or not, and is used for cleanup. |
| 7 | Structured exception handling |
| 8 | To explicitly throw an exception for handling in the Catch block or elsewhere. |
| 9 | By using multiple Catch blocks or pattern matching within a single Catch. |
| 10 | Exception |
| 11 | By creating a class that inherits from Exception. |
| 12 | Inherits Exception |
| 13 | When the existing exceptions do not adequately describe the error or provide sufficient detail. |
| 14 | To provide a customized error message when the exception is thrown. |
| 15 | They can provide specific context for errors that may not fit into standard exception types. |
| 16 | A constructor that calls the base class constructor. |
| 17 | System.Exception |
| 18 | By using the Throw keyword within the custom class. |
| 19 | By accessing the InnerException property. |
| 20 | ToString |
| 21 | To track and review the application’s errors and issues for debugging and analysis. |
| 22 | log4net or NLog |
| 23 | It allows writing event logs to the Windows Event Viewer, useful for tracking application issues. |
| 24 | By using StreamWriter or other file handling techniques to write exception details to a log file. |
| 25 | Logging allows for persistence, tracking of error details over time, and avoiding overloading the user interface. |
| 26 | Error |
| 27 | It organizes and manages the process of recording and storing error information. |
| 28 | Exception message, stack trace, and inner exception details should be logged. |
| 29 | Application.ThreadException |
| 30 | By subscribing to the Application.ThreadException event or handling AppDomain.UnhandledException globally. |