Getting hired as a programmer can be a challenge. There’s a lot of talent out there, and there’s a lot of competition. Many employers are wary of “paper programmers”; people who have no programming experience but just a degree. Because of this, they often ask in-depth programming questions during their interview. These questions can be hard to answer if you haven’t properly prepared. In this article, I’ll help you prepare to ace your next interview with these questions related to the C# programming language. At the same time, you might want to practice with some C# projects. These 50 essential C# questions and answers will help you understand the technical concepts of the language. You’ll walk into a meeting with the hiring manager with confidence. As a developer myself, I use these concepts daily.
• Question 1: What is C#? C# is an object-oriented programming language that is compiled by the .Net framework to generate Microsoft Intermediate Language (MSIL), which is a set of instructions that can run on multiple environmentshttps://www.c-sharpcorner.com/UploadFile/puranindia/C-Sharp-interview-questions/https://www.codecademy.com/resources/blog/c-sharp-interview-questions/. C# is a type-safe language, which means that the program will catch errors as you make them, preventing you from wasting time fixing minor problems later onhttps://www.codecademy.com/resources/blog/c-sharp-interview-questions/. C# supports modern programming features such as generics, delegates, lambda expressions, LINQ, async/await, and morehttps://www.c-sharpcorner.com/UploadFile/puranindia/C-Sharp-interview-questions/.
• Question 2: What are the differences between void, public, and static? Void, public, and static are keywords that modify the behavior of variables or methods in C#. Void is a type modifier that indicates that a variable or method does not return a valuehttps://www.codecademy.com/resources/blog/c-sharp-interview-questions/. Public is an access modifier that indicates that a variable or method can be accessed from anywhere inside the applicationhttps://www.codecademy.com/resources/blog/c-sharp-interview-questions/. Static is a modifier that indicates that a variable or method belongs to the class itself and can be accessed without creating an instance of the classhttps://www.codecademy.com/resources/blog/c-sharp-interview-questions/.
• Question 3: What are jagged arrays? Jagged arrays are arrays of arrays that can have different sizes and dimensionshttps://www.codecademy.com/resources/blog/c-sharp-interview-questions/. They are also called nested arrays or array of arrays. Jagged arrays are useful when you need to store irregular data structures such as a table with different numbers of columns in each row. To declare a jagged array, you use square brackets for each dimension. For example, int[][] jaggedArray = new int[3][]; creates a jagged array with three rows and an unspecified number of columns in each rowhttps://www.codecademy.com/resources/blog/c-sharp-interview-questions/.
• Question 4: What are the differences between out and ref parameters? Out and ref are keywords that modify the behavior of parameters passed to methods in C#. Out and ref parameters allow methods to return more than one value by passing arguments by reference instead of by value. The difference between out and ref parameters is that an argument passed as ref has to be initialized before it is passed to the method, while an argument passed as out does not have to be initialized before it is passed to the methodhttps://www.codecademy.com/resources/blog/c-sharp-interview-questions/. However, both out and ref parameters have to be assigned a value inside the method before it returnshttps://www.codecademy.com/resources/blog/c-sharp-interview-questions/.
• Question 5: What are sealed classes in C#? Sealed classes are classes that cannot be inherited by other classeshttps://www.c-sharpcorner.com/UploadFile/puranindia/C-Sharp-interview-questions/. They are created by using the sealed modifier in the class declaration. Sealed classes are useful when you want to prevent derivation from a class for security or performance reasons. If you try to inherit from a sealed class, you will get a compile-time errorhttps://www.c-sharpcorner.com/UploadFile/puranindia/C-Sharp-interview-questions/.
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