Here are 45+ of the most common VB.Net interview questions and answers that will help you pass one of the most difficult interviews.
1. What does.NET Framework mean?
Microsoft made it so that it works on any platform and in any language. It lets you use different programming languages, like VB.NET, C#, VBScript, Jscript, and managed C++ Codes, on different platforms, like LINUX, Mac OS, Windows, and UNIX. It also gives the user access to different libraries that make the development of applications faster, cheaper, and easier.
2. What does CTS mean?
Common Type System is what CTS stands for. It is a part of the Common Language Specification. Microsoft has set up a Common Tpe System that every language must use. This makes sure that all languages in the same.NET programme are treated the same and have the same meaning.
3. In VB.NET, what is a Constructor?
A Constructor is a special member function or method whose job is to set up new objects of its class. It has the same name as its class. It\’s called a \”function Object() { [native code] }\” because it builds up the values of the class\’s data members. When an object of its associated class is made, the function Object() { [native code] } is called.
4. VB.NET\’s Public Access Modifier is hard to understand.
The Public keyword in the declaration statement says that the element can be accessed from code anywhere in the same project, from other projects that link to the project, and from any assembly built from the project.
Example:
Public Class demoPublicClass
A Public Class, on the other hand, can only be used at the module, interface, or namespace level.
5. VB.NET\’s Windows Forms Controls can be used to select data from a list.
Here are the Windows Forms Controls you can use to choose data from a list:
1. CheckedListBox
2. ComboBox
3. DomainUpDown
4. List Box
5. List View
6. What is the size of a VB.NET integer by default?
In VB.NET, the default size of an integer is 32 bits.
7. Example of a Hello World programme in VB.NET.
The HelloWorld module
Sub Main ()
Console.
WriteLine(“Hello World”)
End Sub
End Module
8. What does CLS mean?
CLS stands for Common Language Standard. It is more or less a subset of all the features that the CLR can support.
9. What is an Object-Oriented Programming Approach?
Object-oriented programming gives you a way to break up programmes into smaller parts called modules. It does this by creating separate memory areas for functions and data that can be used as models to make copies of modules on demand. OOP lets you break up a problem into many parts, which are called \”objects.\” Then, it uses these objects to build data and functions.
10. What does it mean to pick up trash?
Most of the time, Garbage Collection is used for Memory Management. The.NET Framework\’s Garbage Collection handles how memory is given to and taken away from your apps. When garbage collection is done, the garbage collector looks in the managed heap for objects that are no longer being used by applications.
11. Tell me about VB.NET\’s Protected Friend Access Modifier.
Together, the keywords Protected and Friend in the declaration statement tell the computer that the elements are either in the same assembly or are friends.
Example:
Demo of Protected Friend
String As String
It can only be used at the class level, not at the Source File or Namespace level or inside an Interface, Module, Structure, or Procedure.
12. How do Shared Assemblies work?
Shared Assembly is what you call a private assembly that has been put in the Global Assembly Cache. It doesn\’t make a physical copy, and once the Assembly is installed in GAC, any.NET application can use it.
13. List some things that C# has that VB.NET doesn\’t.
Some things that VB doesn\’t have but C# does are:
1. For better performance, unsafe code blocks can be used in C#.
2. C# also supports static classes and comments with more than one line.
3. Anonymous methods and Partially defined interfaces
14. What does \”framework\” mean?
A framework is a structure with different layers that shows what kinds of programmes can or should be built and how they would work together.
Some frameworks also include actual programmes, define computer programming interfaces, and provide programming tools for using the frameworks. It is mainly a set of ideas or a plan that is meant to help the growth of something that will make the structure into something useful.
15. What is Object?
In an object-oriented system, objects are the most important Run-Time entities. They can stand for a place, a person, or a bank account. Objects are basically variables of the Class type.
16. What does MSIL mean?
The letters MSIL stand for Microsoft Intermediate Language. It\’s like the Java Byte Code. Its main goal is to make a code that works on any platform. Just in Time Compiler must turn MSIL into a code that the CPU can understand before a code can be run.
17. What are sets of data?
Datasets are objects that have data tables where you can temporarily store data to use in an application. You can load data into a dataset if your application needs to work with data. You can also run commands or change data in the dataset when it\’s not online.
18. What is Manifest Assembly?
An Assembly Manifest is part of every Assembly. It has the following parts:
1. What the Assembly Is (Name and Version)
2. File Table is a list of all the other files in the assembly.
3. Assembly Reference List with information about dependencies from outside the assembly.
4. Global Objects
19. Describe how .NET is put together.
1. Code from the source is turned into code that can be managed (IL).
2. The CLR turns IL into code that works on a specific platform.
3. MSIL describes a set of portable instructions that can run on any CPU.
20. Garbage Collection Methods in the.NET Framework should be used.
These are the ways that the.NET Framework collects trash:
1. Dispose
2. Finalize
21. What is a VB.NET Message Box?
A message box is a dialogue box that shows the user information about an application. Message boxes can also be used to ask users for information.
22. What does Class mean?
With a class, all of an object\’s data and code can be turned into a user-defined data type. Objects are Class type variables. Once a Class is defined, we can make many Objects of that type. A Class is a group of Objects that are all the same type.
23. Describe the types of assembly.
All Assemblies and type libraries must be registered as COM Clients in the Windows registry in order to use managed types. Assembly is mostly one of the following:
1. Common Meetings
2. Gatherings in Private
24. What\’s the point of New Keyword?
A New keyword is used to create a New Object or set it up for the first time. It\’s used to set a variable to a certain type of data. With the New keyword, you can set up a new object variable.
Example:
object1 should be set to New SqlDataAdapter.
25. What does CLR stand for?
Common Language Runtime is what CLR stands for. It is one of the.NET Framework\’s most important pieces. It manages and runs code written in the.NET architecture. It works the same way as the Java Virtual Machine. The CLR version of.NET is the software version.
26. What is an Assembly?
Applications that use the.NET Framework are made up of parts called assemblies. It makes a basic unit for deployment, version control, reuse, activation scoping, and security permissions. It is a group of Types and Resources that are made to work together and make a logical unit of functionality.
27. How do you tell VB.NET what a Class is?
Example:
Demo in class
Public Name as a String
Finish Class
28. List the different kinds of data validation.
1. Checking the code
2. Data Type Validation
3. Complex Validation
4. Checking the range
29. What are \”private Assemblies\”?
By default, assemblies are set to Private. When you use it in one of the .NET programmes, a hard copy of it is made. If you try to change where the output file is saved, the programme will give you an error. We use Shared Assembly in Global Assembly Cache to get around this problem.
30. What\’s the difference between sub-routines and functions?
In VB.NET, functions can send information back to the place that called them. If you compare it to C++ or Java, it is also known as the Function Return method. Only one thing is different about Sub-Routines: they can\’t return values.
31. Why is Global Assembly Cache important?
Global Cache is the name of the machine-wide code cache that is on every computer where the Common Language Runtime is used. It keeps assemblies that need to be shared by more than one programme on the computer.
32. VB.NET\’s Private Access Modifier is hard to understand.
The Public keyword in the declaration statement means that the elements can only be changed or worked on from within the same module, class, or structure.
Example:
Private Number Integer
Only at the module level can private be used. This means that you can declare a private element inside a module, class, or structure, but not inside a source file or namespace, an interface, or a procedure.
33. Get a list of the Dialog Boxes used in VB.NET Windows Forms.
Here\’s what the Windows Forms Dialog Boxes look like:
1. ColorDialog
2. FontDialog
3. OpenFileDialog
4. PrintDialog
5. PrintPreviewDialog
6. SaveFileDialog
34. List the things that all.NET languages have in common.
Garbage Collection is a feature that all.NET languages have in common. The Garbage Collection feature stops the programme for a few seconds before starting it back up again. The.NET Framework\’s Garbage Collection handles how memory is given to and taken away from your apps.
35. What does the VB.NET Redim variable do?
In VB.NET, Redim is used to change the Array and re-declare it. Once we declare an Array with a size of 10, we can use the ReDim function to change the size if we need to.
36. How does polymorphism work?
It is the ability to show or act in different ways depending on the situation. Operator Overloading is the process of making an Operator or a Function respond differently in different situations.
37. What are VB.NET MDI forms?
MDI represents Multiple Document Interface. It is a programme that lets us see and work on multiple documents at once. Microsoft Excel is an example of an MDI app. Visual Studio.NET is a great tool for working with MDI Forms and Applications.
38. Find out about the different Mouse Events in VB.NET.
In VB.NET, the following are the Mouse Events:
1. Click
2. MouseClick
3. MouseDown
4. MouseWheel
5. MouseHover
39. What are VB.NET Destructors?
A Destructor is used to free or get rid of the objects that a Constructor has made. In VB.NET, the Garbage Collector handles the allocation, assignment, and release of memory for the managed objects in your application. But you may need Destructors to get rid of resources that your application creates that are not managed. A class can only have one destructor.
40. Show how inheritance works in VB.NET.
The idea of inheritance is part of Object-Oriented Programming. It lets you make a New Class that can be used more than once and can extend or change how another class works. By default, all classes in Visual Basic inherit from the Object class. This class supports the.NET class hierarchy and gives all classes low-level services.
41. Tell me about VB.NET\’s Protected Access Modifier.
In the declaration statement, the Protected keyword lists the elements that can only be accessed from within the same class or from a class that this class describes.
Example:
Demo of Protected Class
You can only use the Protected modifier at the Class Level, not at the Source File or Namespace level or inside an Interface, Module Structure, or Procedure.
42. List the languages that can be used with the.NET Framework.
1. VB.NET
2. Codes in C++ that are managed
3. C#
4. VBScript
5. JScript
43. What are VB.NET interfaces?
Interfaces tell classes what their properties, events, and methods are. Interfaces let you define features as small groups of properties, methods, and events that work together well. Interfaces let you define features as small groups of members that are closely related.
44. What are ADO.NET Data Adapters?
A data adapter is used by ADO.NET to connect the dataset to the datasource, which is the database itself. The Fill() methods of the Data Adapter let you get data from the database and put it in the dataset. A data adapter object is used by ADO.NET to connect the dataset object to the database.
45. List the ways that VB and VB.NET are different.
1. VB.NET is a language that is interpreted, while VB.NET is a language that is compiled.
2. Visual Basic can be used with older versions of itself, but VB.NET can\’t.
3. VB can\’t be used to make Multi-Threaded applications, but VB.NET can.
46. How does JIT work in VB.NET?
Just in Time is what JIT stands for. It is a Compiler at heart. It is a service that the CLR uses to turn Intermediate Language into Machine Level Code. When the Assembly is loaded, the method calls are sent to the compiler so that they can be turned into native code. Assembly files for the.NET framework, like dll and exe, can\’t be run on the target processor unless they are changed into native code.
47. VB.NET\’s Friend Access Modifier is hard to understand.
In the declaration statement, the Friend keyword says that the elements can be changed from within the same assembly, but not from outside the assembly.
Example:
Friend demo As String
You can only use the Friend modifier at the Module, Interface, or Namespace level.
48. Get a list of tools for developing in VB.NET.
Here are the tools used to build with VB.NET:
1. Platform for Mono Development (Linux)
2. Visual Studio by Microsoft
So, that was the list of important VB.Net interview questions and answers. If you found something wrong or missing on the list above, please let us know by leaving a comment below.