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Visual C# is a programming language developed by Microsoft as part of the .NET initiative. It is a modern, object-oriented language that enables developers to build a variety of secure and robust applications that run on the .NET framework. Visual C# incorporates many features of the C and C++ languages, while also introducing some new ones for component-oriented programming. Its syntax simplifies many complexities of C++ and provides powerful features such as nullable value types, enumerations, delegates, lambda expressions and direct memory access which are not found in Java. Visual C# also supports generic methods and types, which provide increased type safety and performance. The language is integrated with the Visual Studio IDE, providing developers with a powerful toolset for UI design, debugging, performance analysis among others. Overall, Visual C# is widely used for developing desktop applications, web services, web applications, distributed components and database access.

Ask the right questions secure the right Visual C# talent among an increasingly shrinking pool of talent.

First 20 minutes

General Visual C# app knowledge and experience

The first 20 minutes of the interview should seek to understand the candidate's general background in Visual C# 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 C#?

You declare a variable in Visual C# by specifying its type followed by its name. For example, 'int myNumber;' declares a variable named 'myNumber' of type integer.

What are the different types of loops in Visual C#?

Visual C# supports several types of loops including 'for', 'while', 'do-while', and 'foreach'.

Describe the difference between a class and an object in Visual C#.

A class is a blueprint or template that defines the variables and the methods common to all objects of a certain kind. An object is an instance of a class.

How would you handle exceptions in Visual C#?

Exceptions in Visual C# can be handled using try-catch-finally blocks. The 'try' block contains the code that might throw an exception, the 'catch' block catches the exception and handles it, and the 'finally' block contains code that is always executed, regardless of whether an exception was thrown.

What are delegates in Visual C#?

Delegates in Visual C# are similar to function pointers in C++. They are type-safe objects that reference a method or a group of methods.

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What you’re looking for early on

Does the candidate have a solid understanding of Visual C#?

Has the candidate demonstrated problem-solving skills?

Is the candidate able to communicate effectively?

Does the candidate have experience with relevant tools and technologies?

Next 20 minutes

Specific Visual C# 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 'ref' and 'out' parameters in Visual C#.

'ref' and 'out' are both used to pass arguments by reference. The difference is that 'ref' requires the variable to be initialized before it is passed, while 'out' does not require the variable to be initialized before it is passed.

How would you implement multithreading in Visual C#?

Multithreading in Visual C# can be implemented using the 'System.Threading' namespace. The 'Thread' class can be used to create and control threads.

What are generics in Visual C#?

Generics in Visual C# allow you to define type-safe data structures, without committing to actual data types. This results in a significant performance boost and higher quality code.

Describe the difference between 'struct' and 'class' in Visual C#.

The main difference between 'struct' and 'class' in Visual C# is that 'struct' is a value type while 'class' is a reference type. Also, 'struct' does not support inheritance, while 'class' does.

How would you implement inheritance in Visual C#?

Inheritance in Visual C# is implemented using the ':' operator. The base class is followed by the ':' operator, followed by the derived class.

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At this point, a skilled Visual C# engineer should demonstrate strong problem-solving abilities, proficiency in Visual C# 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 C#.

What does the following code do?
string[] names = { "John", "Jane", "Jill", "Jack" }; 
Console.WriteLine(string.Join(", ", names));
This code declares an array of strings, then uses the 'Join' method to concatenate all the strings in the array, separated by a comma and a space. The result is then written to the console.
What will be the output of the following code?
int x = 10; 
int y = 2; 
Console.WriteLine(x / y);
This code will output '5'. It divides the integer 'x' by the integer 'y' and writes the result to the console.
What does the following code do?
List numbers = new List { 1, 2, 3, 4, 5 }; 
numbers.RemoveAt(2); 
Console.WriteLine(string.Join(", ", numbers));
This code creates a list of integers, removes the item at index 2 (which is '3'), and then writes the remaining items in the list to the console, separated by a comma and a space.
What does the following code do?
Thread thread = new Thread(() => 
{ 
  for (int i = 0; i < 10; i++) 
  { 
    Console.WriteLine(i); 
  } 
}); 
thread.Start();
This code creates a new thread and starts it. The thread runs a loop that prints the numbers 0 through 9 to the console.

Wrap-up questions

Final candidate for Visual C# 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 C# application deployments. Inquire about their experience in handling system failures and their approach to debugging and troubleshooting.

What are lambda expressions in Visual C#?

Lambda expressions in Visual C# are a concise way to write inline functions. They are particularly useful when working with collections and LINQ queries.

Describe the difference between 'abstract' and 'interface' in Visual C#.

An 'abstract' class can have implementation for some of its members, but the 'interface' can't have implementation for any of its members. Interfaces also cannot have fields where as an abstract class can have fields.

How would you implement polymorphism in Visual C#?

Polymorphism in Visual C# can be implemented in two ways: compile-time polymorphism (overloading) and runtime polymorphism (overriding).

Visual C# application related

Product Perfect's Visual C# development capabilities

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

Visual C# Consultive assessments

Visual C# Application Conversion Assessment Visual C# Application Integration Assessment Visual C# Data & Database Integration Assessment

Custom Visual C# development projects

Custom Visual C# App Conversion Visual C# Custom App Development Process App UI Design for Visual C# Facelifts

Hiring guide for Visual C# Engineers

Visual C# 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 C# engineer at this point.

Visual C# Consultive assessments

Custom Visual C# development projects