int result = 5 + 7;.webp){kind=logo}
Ask the right questions to secure the right C# talent among an increasingly shrinking pool of talent.
C# is a modern, object-oriented programming language developed by Microsoft in 2000 as part of its .NET initiative (Microsoft, 2000). It was designed by Anders Hejlsberg, who also contributed to the development of Turbo Pascal and Delphi (Microsoft, 2000). C# is heavily influenced by C and C++, but it also incorporates elements from Java and other languages, aiming to simplify coding and enhance developer productivity (ECMA International, 2002). It is widely used for developing desktop applications, web services, and games, particularly on the Windows platform (Microsoft, 2020). C# continues to evolve, with regular updates providing new features and improvements to the language (Microsoft, 2020).
The next 20 minutes of the interview should attempt to focus more specifically on the development questions used, and the level of depth and skill the engineer possesses.
Delegates in C# are similar to function pointers in C or C++. They are type-safe objects that reference methods with a particular parameter list and return type. Delegates allow methods to be passed as parameters.
The main differences between a struct and a class in C# are that structs are value types while classes are reference types, and structs do not support inheritance, but classes do. Also, a struct can't have a default constructor or destructor, but a class can.
In C#, exceptions are handled using try, catch, and finally blocks. The 'try' block contains the code that may potentially throw an exception. The 'catch' block contains the code that is executed when an exception occurs. The 'finally' block contains code that is always executed, regardless of whether an exception was thrown or not.
There are three types of comments in C#. Single line comments which are denoted by '//', multiline comments denoted by '/*' and '*/', and XML comments denoted by '///'. They are used to add descriptive text in the code for understanding and readability purposes.
You can declare a variable in C# by specifying the type followed by the variable name. For example, 'int myVariable;' declares a variable named 'myVariable' of type integer.
Understanding the software development life cycle is important for a developer to effectively plan, design, build, and test software.
The field of software development is constantly evolving, so it's important that the candidate is willing to keep their skills up to date.
Good communication skills are important for a developer to be able to explain complex technical issues to non-technical team members or stakeholders.
Software development is often a collaborative effort, so it's important that the candidate can work effectively with others.
Problem-solving and critical thinking are crucial skills for a developer as they will often need to find solutions to complex coding issues.
This is important because a strong foundation in the basics of C# is essential for the candidate to be able to write efficient and effective code.
The next 20 minutes of the interview should attempt to focus more specifically on the development questions used, and the level of depth and skill the engineer possesses.
'is' operator is used to check the compatibility of an object with a given type and it returns the result as Boolean. On the other hand, 'as' operator is used for casting of object to a type or a class. If the casting is not possible it returns null.
Inheritance in C# is implemented by using the ':' symbol. For example, if you have a base class 'Animal' and a derived class 'Dog', you would declare the Dog class as 'public class Dog : Animal'. This means that 'Dog' inherits from 'Animal'.
Generics in 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, because you get to reuse data processing algorithms without duplicating code.
Both 'out' and 'ref' are 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 to the method.
Threading in C# can be implemented by using the 'System.Threading' namespace. The 'Thread' class is used to create and control a thread, get its status, and perform other operations like starting, pausing, and resuming a thread.
At this point, a skilled C# engineer should demonstrate strong technical proficiency in C#, problem-solving abilities, and a solid understanding of object-oriented programming. Red flags include inability to explain complex concepts, lack of real-world application experience, and poor debugging skills.
int result = 5 + 7;Console.WriteLine(5 == 7);List numbers = new List {1, 2, 3, 4, 5};
numbers.Reverse(); Thread thread = new Thread(() => {
Console.WriteLine('Hello, World!');
});
thread.Start();public class Person {
public string Name { get; set; }
public int Age { get; set; }
}async Task AccessTheWebAsync() {
HttpClient client = new HttpClient();
Task getStringTask = client.GetStringAsync('http://msdn.microsoft.com');
string urlContents = await getStringTask;
return urlContents.Length;
} The final few interview questions for a C# candidate should typically focus on a combination of technical skills, personal goals, growth potential, team dynamics, and company culture.
Async and await are used to create asynchronous methods in C#. An async method runs asynchronously in a separate thread and doesn't block the UI thread. The 'async' keyword is used to define an asynchronous method. The 'await' keyword is used in an async method to suspend the execution until the awaited task completes.
Extension methods in C# allow you to add methods to existing types without creating a new derived type, recompiling, or modifying the original types. Extension methods are a special kind of static method, but they are called as if they were instance methods on the extended type.
'const' and 'readonly' both are used to make a field constant which means once a value is assigned to them, it can't be changed. The difference is that 'const' is compile-time constant whereas 'readonly' is runtime constant. 'const' value is assigned at the time of declaration whereas 'readonly' value can be assigned either at the time of declaration or inside the constructor.
Polymorphism in C# can be implemented in two ways: compile-time polymorphism (also known as overloading) and runtime polymorphism (also known as overriding). Overloading is achieved by defining multiple methods with the same name but different parameters. Overriding is achieved by using the 'override' keyword to redefine a method in a derived class that has already been defined in the base class.
Lambda expressions are a concise way to represent anonymous methods or functions. They can contain expressions and statements, and can be used to create delegates or expression tree types. They are particularly useful for writing LINQ query expressions.
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