Released in 2002 by Microsoft, C# is a programming language widely used in web development. Owing to its significance in the tech field, C# coding interview questions are given a lot of importance during technical interviews.
Because there are so many questions to sort through, practicing the most important C# coding interview questions can be difficult for freshers and experienced professionals. In this article, we'll look at the top questions you should practice to ace the C# coding interview.
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In this article, we’ll be covering the following topics:
Pronounced ‘see sharp,’ C# is an object-oriented programming (OOP) language. It was released in 2002 by Microsoft and standardized by ISO and ECMA to be used on the .NET platform. The latest version of the language is C# 6.0.
The primary features of C# are:
To prepare you for your technical interview, here are some basic and advanced C# coding interview questions and answers to get you started:
The different classes in C# are:
(This is a very popular C# coding interview question, just a heads-up.)
The virtual keyword is used for determining a class to specify that the methods and properties of that class can be overridden in derived classes.
The finally block will be carried out irrespective of exception. So when an exception occurs while executing the code in the try block, the control is given back to catch block, and then finally block is executed.
Some major advantages of using C# are:
Method overriding: Also known as RunTime Polymorphism, Dynamic Polymorphism, or Late Binding, this process is responsible for creating a method in the derived class using the same signature and name in the base class.
Method overloading: Also known as Early Binding, Compile Time Polymorphism, or Static Binding, it creates two or more functions (or methods) using the same name but different parameters in the same class.
The difference is:
Dispose () - It is used to release unmanaged resources (such as files, database connections, etc.) when asked for specifically.
Finalize () - It releases the unmanaged resources present on the code prior to garbage collection.
Some exceptions in C# are:
The object pool is responsible for tracking the objects used in the code when a request is made for a new object to reduce the object creation overhead.
The purpose of linear search is to compare the search item with elements present in the list one at a time with the help of a loop and stop the moment the first copy of the search element in the list is obtained. If you consider the worst case in which the search element doesn’t exist in the list of size N, then the Simple Linear Search will consider a total of 2N+1 comparisons.
Coming to Sentinel Linear Search, the idea behind it is to cut down the number of comparisons needed to find an element in a list. In this, the last element of the list is replaced with the search element itself, and a while loop is run to determine if a copy of the search element in the list exists. The loop is quit as soon as the search element is found. It reduces one comparison in each repetition.
(Another important C# coding interview question, so prepare accordingly.)
If two words contain the same number of characters and have the same number of characters, they’re anagrams. There are two solutions you can mention:
Although class and struct both are user-defined data types, they do have some major differences:
A class won’t be overridden in C# if the sealed keyword is used.
The difference between throw and throw ex is as follows:
== Operator (usually means the same as ReferenceEquals, it can be overridden) is used to compare the reference identity. On the other hand, the Equals() (virtual Equals () )method compares whether two objects are equivalent.
Known as the null-coalescing operator, the ?? operator defines a default value for nullable value types or reference types. It is responsible for returning the left-hand operand if the operand is not null. Else, it returns the right operand.
When you’re preparing for the technical interview, ensure that you prepare the following C# coding interview questions as well. These will come in handy to experienced professionals as well as freshers.
Q1. Which C# structure would you use to get the fastest large objects manipulation?
Q2. Which C# features do you like the most and why?
Q3. How, according to you, can a great # code be written?
Q4. Explain the difference between interface and abstract class?
Q5. Will you be able to write the FizzBuzz program in C# now?
Q6. What is LINQ in C#? Have you ever used it?
Q7. Define Dynamic Dispatch.
Q8. What makes your code really object-oriented?
Q9. How to avoid the NULL trap?
Q10. List the fundamental principles of OO programming?
Q11. Name three ways to pass parameters to a method in C#.
Q12. Give some features of generics in C#.
Q13. What are delegates and their types in C#?
Q14. Compare ‘string’ and ‘StringBuilder’ in C#.
Q15. In C#, what’s the differentiating factor between an abstract class and an interface?
Q1. What interview are questions asked in C#?
Some C# coding interview questions are: Give examples of the different types of comments in C#. Differentiate between public, static, and void. What are Jagged Arrays?
Q2. Which topics are asked in C# coding interview questions?
Some important topics when preparing for C# interview questions are: CLR, CLS, CTS, Classes & Objects, and OOPs.
Q3. How do you differentiate between C# and C?
One of the most important differences between C and C# is that while C language can be executed cross-platform, C# (pronounced C sharp) requires a .NET framework to execute the language.
Q4. What is the extension method in C# interview questions?
The extension method is a static method of a static class and can be used with the help of the instance method syntax. Extension methods are useful in adding new behaviors to an existing type without altering anything.
Q5. How do you prepare for C# coding interview questions?
Keep your C# basics on point and practice mock interviews. You can even take part in coding competitions to improve your speed and accuracy.
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