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VB.NET Interview Questions & Answers - Learning Mode
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VB.NET Interview Questions & Answers - Learning Mode

Visual Basic .NET (VB.NET) is a multi-paradigm, object-oriented programming language, implemented on the .NET Framework. Microsoft launched VB.NET in 2002 as the successor to its original Visual Basic language. VB.Net is a simple, modern, object-oriented computer programming language developed by Microsoft to combine the power of .NET Framework and the common language runtime with the productivity benefits that are the hallmark of Visual Basic.

Try VB.NET Interview Questions & Answers - Exam Mode

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VB.NET Interview Questions & Answers - Learning Mode
Try VB.NET Interview Questions & Answers - Exam Mode
Question: What is the base class of .net?



Answer: System.Object is the base class of .NET

It Supports all classes in the .NET Framework class hierarchy and provides low-level services to derived classes. This is the ultimate superclass of all classes in the .NET Framework; it is the root of the type hierarchy.
Source: CoolInterview.com
Question: Difference Between Array and array list?

Answer: Array is the collection of values of the same data type
>the variables in an array is called array elements
>Array is a reference type data type
>The array structure in System's Memory

Array list is a class .
>when you want to access the elements of an array through its index value location in an array,use an ArrayList.
>The use of the arraylist is an alternative to the use of th array.
>The Methods Of ArrayList class are
1)Add
2)Remove
3) Source: CoolInterview.com
Question: How to store and retrieve images in SQL server database through VB.NET?



Answer: SQL Server supports the ability for clients to store objects within tables Source: CoolInterview.com
Question: what is the difference between string and stringbuilder?

Answer: system.string is immutable,system.string builder was designed with the purpose of having a mutable string where a variety of operations can be performed.
Source: CoolInterview.com
Question: What is .net?




Answer: .Net is the Development Platform which provides advanced feature facilities for the web and window application along with the window services . The .Net is the Middle layer between the operating System and the .Net application .The feature of .Net that the .Net Component can talk with each other without worrying about the language in which they are originally.. Two main components are CLR stands for the common Language Runtime and the .Net FrameWork Base classes. The CLR performs the task Source: CoolInterview.com
Question: what is non_deterministic finalization?

Answer: The Finalize method is actually executed by the runtime on a special thread allocated by the Garbage Collector (GC).The Finalize method is executed whenever the runtime feels it is appropriate, such as when a low-resource condition occurs and this situation is often referred to as non-deterministic finalization. Source: CoolInterview.com
Question: http://www.programmersheaven.com/2/dotnet-faq-vb

Answer: There are quite a few differences in VB6 and VB.NET. We will highlight some of these here in points:

* The greatest change in VB6 and VB.NET is of runtime environment. VB6 used the VB-Runtime while VB.NET uses the .Net Common Language Runtime (.Net CLR). The CLR is much better designed and implemented than VB-Runtime. The CLR uses better code translation through Just in Time compiler while VB-Runtime interprets the code. The CLR Garbage Collector is also more efficient than VB6 one as Source: CoolInterview.com
Question: Differences between VB.Net and C#, related to OOPS concepts



Answer: VB.NET is a windows application

Where as C# is a console
Source: CoolInterview.com
Question: What do you mean by Garbage Collection in VB.net

Answer: Garbage collection is the mechanism to release memory from unused objects and components of the application. Source: CoolInterview.com
Question: How can we remove Handlers at Run time ?



Answer: RemoveHandler myobj.myEvent, AddressOf MyEventHandler
Source: CoolInterview.com
Question: How do you define a read only property in a class module?

Answer: Declare Only Get function of the property. Source: CoolInterview.com
Question: Explain about the feature Anonymous type?

Answer: Anonymous type is a feature of VB.NET and it allows data types to be created from the code which requires it. This feature is present in VB as well as C#. They should be stored in variables declared with the keyword VAR. Dynamic typing is different and shouldn?t be confused with Anonymous type. Source: CoolInterview.com
Question: What are attributes in Visual Basic .NET?

Answer: Attributes are items that hold information about items we are using in VB.NET. They are used when VB.NET needs to know more than what standard syntax can specified. Attributes are enclosed in angle brackets<>.

Example: To call a Windows API functions you have to include a dynamic link library (DLL) reference that the function you are calling resides in. This is done using the DLLImport attribute as follows:

Public Shared Function<DllImport""user32.dll")>MessageBox(Byval Source: CoolInterview.com
Question: Name some of the features of C# which are not present in VB.NET?

Answer: Some of the features which are not present in VB are as follows they are: -
1) It supports unsafe code blocks for improved performance.
2) Partial interfaces and anonymous methods.
3) Multi line comments and static classes. Etc Source: CoolInterview.com
Question: What is the importance of the Option statement?

Answer: The Option statement is used to prevent syntax and logical errors in code. The possible suffixes of this statement are:

* Option Explicit: Is the default abd is On. Option Explicit requires declaration of all variables before they are used.
* Option Compare: This can be set to Binary or Text and it specifies if stringsp are to be compared using binary or text comparison operations.
* Option Strict: The default is Off. An example: If value of one data type is assigned to Source: CoolInterview.com
Question: How to get the environment information in VB.NET?

Answer: The System.Environment namespace includes the functionality to get the environment information such as the UserName and OS Version.


File name is SystemInfo.vb
Imports System
Class SystemInfo
Shared Sub main()
Console.WriteLine("")
Console.WriteLine("Current User")
Console.WriteLine(Environment.UserName)
Console.WriteLine("")
Console.WriteLine("Name of the Machine")
Source: CoolInterview.com
Question: Name and explain some of the exclusive features which are present in VB?

Answer: Some of the features which are exclusive to VB are as follows: -
1) Name space can be hidden which can be disabled.
2) Certain project files can be hidden and a user can show them if he intends to do.
3) Lots and lots of shortcuts are present which ease the development of programs.
4) Using the AddressOf myObject function a delegate can be made. Source: CoolInterview.com
Question: How do I create Procedure Delegates?

Answer: Delegates are used to work with the address of procedures. This is much like pointers in C and C++. Sometimes it's useful to pass the location of a procedure to other procedures.

Example working with Delegates:

Module Module1
Delegate Sub SubDelegate1(ByVal str as String)
Sub Main()
Dim Mess as SubDelegate1
Mess-AddressOf Display
Mess.Invoke(?Hello from Delegates?)
End Sub
Sub Display(ByVal str as String)
System.Console.WriteLine(StrText)
End Sub
E Source: CoolInterview.com
Question: Explain about visual basic?

Answer: Visual basic is associated with the IDE of Microsoft. It is basically useful to implement RAD of GUI. Creation of Active X scripts are very easy and efficient through VB. Windows API can also be used to create application on windows desktop and its applications. This was primarily designed to create applications for windows platform. Source: CoolInterview.com
Question: Which is the tool which can convert Visual basic old version to .NET compatibility version?

Answer: There is a tool available which can convert old visual basic functions into new .NET code. Artin soft Visual basic upgrade Companion is very useful in converting VB code into .NET code. This tool was developed by Artin. This tool is integrated in Visual studio.NET 2005. It handles programs such as structured handling, error handling, etc. Source: CoolInterview.com

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