MCQs on Integration with .NET Libraries | Visual Basic .NET (VB.NET)

Enhance your knowledge of integrating with .NET libraries, working with System.IO, and understanding interoperability between .NET languages with these 30 multiple-choice questions. Perfect for developers looking to level up their skills in these essential areas of VB.NET programming.

Integration with .NET Libraries

1. Which namespace is primarily used for handling file input and output operations in VB.NET?
   • A) System.IO
   • B) System.Text
   • C) System.Net
   • D) System.Data
2. How do you access a specific class from the System.IO namespace?
   • A) System.IO.File()
   • B) IO.File()
   • C) File.Open()
   • D) File.ReadText()
3. What method is used to read all text from a file in VB.NET?
   • A) File.Read()
   • B) File.ReadAllText()
   • C) File.OpenText()
   • D) File.WriteAllText()
4. Which method in the FileStream class is used to write data to a file?
   • A) WriteByte()
   • B) Write()
   • C) Append()
   • D) Read()
5. Which class in the System.IO namespace is used for reading and writing text files in a buffered manner?
   • A) StreamReader
   • B) TextWriter
   • C) FileStream
   • D) StreamWriter
6. To append text to an existing file in VB.NET, which method is used?
   • A) File.AppendAllText()
   • B) File.WriteAllText()
   • C) File.Create()
   • D) File.Copy()
7. Which of the following is true about DirectoryInfo in System.IO?
   • A) It only deals with files
   • B) It allows you to query directory properties
   • C) It doesn’t support directory creation
   • D) It’s part of the System.Net namespace
8. What is the main difference between StreamReader and FileReader?
   • A) StreamReader is for binary files
   • B) StreamReader is used for text files only
   • C) FileReader doesn’t exist
   • D) StreamReader is slower
9. Which function checks whether a file exists before attempting to open it?
   • A) File.Exists()
   • B) File.CheckExist()
   • C) File.ExistsFile()
   • D) File.Verify()
10. In VB.NET, how would you create a new file and write to it?
    • A) File.CreateNew()
    • B) File.Create()
    • C) File.Open()
    • D) File.WriteText()

Using System.Diagnostics for Logging

11. Which class in the System.Diagnostics namespace is used for logging and diagnostics?
    • A) EventLog
    • B) Trace
    • C) Debug
    • D) All of the above
12. What method in the Trace class allows writing a message to the trace listener?
    • A) Trace.WriteLine()
    • B) Trace.Write()
    • C) Trace.Log()
    • D) Trace.Append()
13. What does the Debug class help with in VB.NET?
    • A) File handling
    • B) Writing logs for debugging purposes
    • C) Memory management
    • D) Error handling
14. Which of the following is a valid target for trace output in VB.NET?
    • A) Console
    • B) EventLog
    • C) Log file
    • D) All of the above
15. What method in the EventLog class can you use to write an entry to the Windows Event Log?
    • A) EventLog.Write()
    • B) EventLog.Log()
    • C) EventLog.WriteEntry()
    • D) EventLog.Append()
16. To write custom trace messages in a VB.NET application, you would use:
    • A) TraceListener
    • B) TraceWriter
    • C) DebugListener
    • D) EventLog
17. How do you start tracing for a specific condition in VB.NET?
    • A) Trace.Start()
    • B) Trace.Begin()
    • C) Trace.Listeners.Add()
    • D) Trace.Setup()
18. In System.Diagnostics, how do you stop collecting trace information?
    • A) Trace.Close()
    • B) Trace.Stop()
    • C) Trace.Listeners.Clear()
    • D) Trace.Clear()
19. What method is used to listen to trace output in an application?
    • A) AddListener()
    • B) ListenToTrace()
    • C) TraceListener()
    • D) TraceOutput()
20. Which of the following is NOT a valid trace listener?
    • A) TextWriterTraceListener
    • B) EventLogTraceListener
    • C) FileTraceListener
    • D) ConsoleTraceListener

Interoperability with Other .NET Languages

21. What feature of VB.NET allows interaction with other .NET languages like C#?
    • A) COM Interop
    • B) Cross-language inheritance
    • C) .NET CLR (Common Language Runtime)
    • D) Shared Libraries
22. Which of the following makes it possible for VB.NET to call C# code?
    • A) Using COM Interop
    • B) Using P/Invoke
    • C) Using the CLR
    • D) All of the above
23. How can VB.NET call a method in a C# library?
    • A) By using COM Interop
    • B) By referencing the C# assembly in the project
    • C) By creating a new C# object
    • D) Both B and C
24. Which .NET language is fully interoperable with VB.NET through the CLR?
    • A) C++
    • B) C#
    • C) F#
    • D) All of the above
25. How do you compile code in one .NET language and use it in another language?
    • A) Using assemblies
    • B) Using COM Interop
    • C) Using shared memory
    • D) Using P/Invoke
26. What does P/Invoke stand for in .NET?
    • A) Platform Invocation
    • B) Parallel Invocation
    • C) Private Invocation
    • D) Public Invocation
27. Which of the following helps ensure that code from different languages can run together?
    • A) IL (Intermediate Language)
    • B) CLR
    • C) JIT (Just-In-Time) compilation
    • D) All of the above
28. To use a .NET class from C++ in VB.NET, which of these is required?
    • A) COM Interop
    • B) Assembly reference
    • C) DLL binding
    • D) Native code integration
29. Which of the following is necessary for seamless language interoperability in the .NET framework?
    • A) Same data types
    • B) Same compiler
    • C) CLR
    • D) Similar syntax
30. What feature in .NET allows invoking methods from different programming languages?
    • A) Language-Independent Code
    • B) .NET Interoperability
    • C) COM Interop
    • D) All of the above

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