VB.NET continues to be a strong and versatile programming language, widely used for building Windows applications, web services, and more. Whether you’re preparing for a developer interview or refreshing your skills, mastering important VB.NET questions answers is key to success.
In this guide, we’ll cover the top VB.NET questions and answers you need to know, along with tips to tackle even tricky technical interviews with confidence.
📘 What is VB.NET?
VB.NET (Visual Basic .NET) is an object-oriented programming language developed by Microsoft. It runs on the .NET Framework and is known for its simplicity, ease of learning, and integration with Windows-based applications. VB.NET allows developers to create powerful desktop, web, and mobile apps efficiently.
1. What is VB.NET?
Answer:
VB.NET is an object-oriented programming language developed by Microsoft that runs on the .NET Framework. It is used to build Windows applications, web services, and websites.
2. What are the major differences between VB.NET and Visual Basic 6.0?
Answer:
VB.NET supports full object-oriented features, uses structured error handling, runs on the .NET Framework, and compiles code into MSIL, unlike VB6 which compiles into native code.
3. What is a Namespace in VB.NET?
Answer:
A Namespace is a container that holds classes, interfaces, and functions, helping to organize code and prevent naming conflicts.
4. Explain the use of “Option Explicit” and “Option Strict.”
Answer:
Option Explicitforces variable declaration.Option Strictrestricts implicit data conversions to prevent data loss and runtime errors.
5. What is a Property in VB.NET?
Answer:
A Property is a member that provides a flexible mechanism to read, write, or compute the values of private fields of a class.
6. Differentiate ByVal and ByRef in VB.NET.
Answer:
ByValpasses a copy of the value to the function.ByRefpasses the actual reference, allowing the function to modify the original variable.
7. What is Late Binding?
Answer:
Late binding means the method or property is called on an object during runtime rather than compile time, typically using Object type.
8. What is an Abstract Class?
Answer:
An Abstract Class cannot be instantiated and may contain abstract members that must be implemented by derived classes.
9. What is an Interface?
Answer:
An Interface defines a contract (method signatures) that implementing classes must fulfill without providing any implementation details.
10. Explain Try…Catch…Finally in VB.NET.
Answer:
It is used for structured exception handling:
Tryblock contains code that might throw an exception.Catchhandles the error.Finallyruns code after Try and Catch, regardless of whether an error occurred.
11. What is CLR in VB.NET?
Answer:
CLR (Common Language Runtime) manages memory, code execution, security, and other system services for .NET applications.
12. How do you define an Array in VB.NET?
Answer:
vb.netCopyEditDim numbers() As Integer = {1, 2, 3, 4, 5}
Arrays store multiple values of the same type.
13. What are Delegates in VB.NET?
Answer:
Delegates are type-safe pointers to methods. They allow methods to be passed as parameters.
14. Explain Overloading and Overriding in VB.NET.
Answer:
- Overloading: Same method name but different parameters.
- Overriding: Redefining a base class method in a derived class.
15. What is ADO.NET?
Answer:
ADO.NET is a part of .NET that provides access to data sources such as SQL Server and XML files in a disconnected architecture.
16. What are Shared Members?
Answer:
Shared members (variables, methods) belong to the class itself rather than an instance of the class.
Example:
vb.netCopyEditPublic Shared count As Integer
17. What is the use of “My” namespace in VB.NET?
Answer:
The “My” namespace provides easy and quick access to application-related properties and information such as file system, settings, and resources.
18. Explain Constructors in VB.NET.
Answer:
A Constructor is a special method that is automatically called when an object is created, used to initialize the object’s data.
Example:
vb.netCopyEditPublic Sub New()
' Initialization code
End Sub
19. How is Inheritance implemented in VB.NET?
Answer:
Inheritance allows a class (derived class) to acquire properties and behaviors (methods) from another class (base class) using the Inherits keyword.
Example:
vb.netCopyEditPublic Class ChildClass
Inherits ParentClass
End Class
20. What are Collections in VB.NET?
Answer:
Collections are classes designed to store, retrieve, and manage groups of related objects. Examples include List(Of T), ArrayList, and Dictionary.