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Visual Basic .NET (VB.NET) is an object-oriented programming language developed by Microsoft. It is an evolution of the classic Visual Basic language, designed to take advantage of the .NET framework. VB.NET provides a simple and efficient way to develop various types of applications such as Windows applications, web services, web applications, and mobile apps. It supports features like inheritance, interfaces and overloading which are not available in traditional Visual Basic. The syntax is easy to understand for beginners making it a popular choice for those new to programming while also offering advanced capabilities for experienced programmers.

Ask the right questions secure the right Visual Basic .NET talent among an increasingly shrinking pool of talent.

First 20 minutes

General Visual Basic .NET app knowledge and experience

The first 20 minutes of the interview should seek to understand the candidate's general background in Visual Basic .NET application development, including their experience with various programming languages, databases, and their approach to designing scalable and maintainable systems.

How would you declare a variable in Visual Basic .NET?

You can declare a variable in Visual Basic .NET using the Dim statement. For example, 'Dim x As Integer' declares an integer variable named x.

What are the different data types in Visual Basic .NET?

Visual Basic .NET supports several data types, including Integer, Double, Char, String, Boolean, Date, and Object.

Describe the difference between ByVal and ByRef in Visual Basic .NET.

ByVal passes a variable by value, meaning a copy is made in memory. Changes to the copy do not affect the original variable. ByRef passes a variable by reference, meaning changes to the variable within the function do affect the original variable.

How would you handle exceptions in Visual Basic .NET?

You can handle exceptions in Visual Basic .NET using Try, Catch, Finally blocks. The code within the Try block is executed, if an exception occurs it is caught in the Catch block, and the Finally block is executed regardless of whether an exception occurs.

What are the different types of loops in Visual Basic .NET?

Visual Basic .NET supports several types of loops including For, For Each, While, and Do While/Until loops.

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What you’re looking for early on

Has the candidate demonstrated a strong understanding of Visual Basic .NET?

What is the candidate's problem-solving ability like?

Does the candidate have experience with relevant tools and technologies?

How well does the candidate understand software development methodologies?

Next 20 minutes

Specific Visual Basic .NET development questions

The next 20 minutes of the interview should focus on the candidate's expertise with specific backend frameworks, their understanding of RESTful APIs, and their experience in handling data storage and retrieval efficiently.

Describe the difference between a class and a structure in Visual Basic .NET.

A class is a reference type and structure is a value type. This means that structures are stored on the stack, while classes are stored on the heap. Another difference is that structures do not support inheritance, while classes do.

How would you implement inheritance in Visual Basic .NET?

Inheritance in Visual Basic .NET is implemented using the Inherits keyword. For example, 'Public Class Employee Inherits Person' would mean that the Employee class inherits from the Person class.

What are the different levels of access modifiers in Visual Basic .NET?

Visual Basic .NET has five levels of access modifiers: Public, Protected, Friend, Protected Friend, and Private.

Describe the difference between overriding and overloading in Visual Basic .NET.

Overriding is when a method in a derived class has the same name as a method in the base class, and you want the derived class's method to be called instead. Overloading is when a class has two or more methods with the same name but different parameters.

How would you create an array in Visual Basic .NET?

You can create an array in Visual Basic .NET using the Dim statement and specifying the size of the array. For example, 'Dim numbers(5) As Integer' creates an integer array with six elements.

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At this point, a skilled Visual Basic .NET engineer should demonstrate strong problem-solving abilities, proficiency in Visual Basic .NET programming language, and knowledge of software development methodologies. Red flags include lack of hands-on experience, inability to articulate complex concepts, or unfamiliarity with standard coding practices.

Digging deeper

Code questions

These will help you see the candidate's real-world development capabilities with Visual Basic .NET.

What does the following Visual Basic .NET code do?
Dim x As Integer = 10
If x > 5 Then
Console.WriteLine("x is greater than 5")
End If
This code declares an integer variable 'x' and assigns it a value of 10. It then checks if 'x' is greater than 5. If 'x' is indeed greater than 5, it prints 'x is greater than 5' to the console.
What will be the output of the following Visual Basic .NET code?
Dim str As String = "Hello, World!"
Console.WriteLine(str.Substring(0, 5))
This code will output 'Hello'. The Substring method is used to extract a portion of the string. Here, it starts at index 0 and extracts 5 characters.
What does the following Visual Basic .NET code do?
Dim numbers() As Integer = {1, 2, 3, 4, 5}
For Each num In numbers
Console.WriteLine(num)
Next
This code declares an integer array 'numbers' with values 1, 2, 3, 4, 5. It then iterates over each element in the array and prints it to the console.
What does the following Visual Basic .NET code do?
Imports System.Threading
Dim t As Thread = New Thread(AddressOf PrintNumbers)
t.Start()
Sub PrintNumbers()
For i As Integer = 1 To 10
Console.WriteLine(i)
Next
End Sub
This code creates a new thread 't' that runs a subroutine 'PrintNumbers'. The subroutine prints numbers from 1 to 10. The thread is then started with 't.Start()'.

Wrap-up questions

Final candidate for Visual Basic .NET Developer role questions

The final few questions should evaluate the candidate's teamwork, communication, and problem-solving skills. Additionally, assess their knowledge of microservices architecture, serverless computing, and how they handle Visual Basic .NET application deployments. Inquire about their experience in handling system failures and their approach to debugging and troubleshooting.

What are the different types of collections in Visual Basic .NET?

Visual Basic .NET supports several types of collections including ArrayList, Hashtable, SortedList, Stack, Queue, and BitArray.

Describe the difference between early binding and late binding in Visual Basic .NET.

Early binding is when the type of an object is known at compile time. Late binding is when the type of an object is only known at runtime. Early binding is generally faster and safer, but late binding can be more flexible.

How would you connect to a database in Visual Basic .NET?

You can connect to a database in Visual Basic .NET using the SqlConnection class. You would need to create an instance of this class, specifying the connection string, and then call the Open method to establish the connection.

Visual Basic .NET application related

Product Perfect's Visual Basic .NET development capabilities

Beyond hiring for your Visual Basic .NET engineering team, you may be in the market for additional help. Product Perfect provides seasoned expertise in Visual Basic .NET projects, and can engage in multiple capacities.

Visual Basic .NET Consultive assessments

Visual Basic .NET Application Conversion Assessment Visual Basic .NET Application Integration Assessment Visual Basic .NET Data & Database Integration Assessment

Custom Visual Basic .NET development projects

Custom Visual Basic .NET App Conversion Visual Basic .NET Custom App Development Process App UI Design for Visual Basic .NET Facelifts

Hiring guide for Visual Basic .NET Engineers

Visual Basic .NET Developer Hiring Guide

What you’re looking for early on

The ideal back-end app developer

What you’re looking to see on the Visual Basic .NET engineer at this point.

Visual Basic .NET Consultive assessments

Custom Visual Basic .NET development projects