C# / ASP.NET Core / MVC / API – The 500 most important interview questions

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Top 500 .NET Interview Questions – OOPS/ C#/ ASP .NET/ MVC/ SQL /.NET Core /Web API
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This video contains the 50 most frequently asked interview questions.
00:00 – Introduction
01:16 – Q1. What are the main concepts of OOPS? What are classes and objects?
07:18 – Q2. What is inheritance? Why is inheritance important?
10:33 – Q3 What are the different types of inheritance?
14:38 – Q4 How can inheritance of a class be prevented?
16:22 – Q5 What is abstraction?
19:30 – Q6 What is encapsulation?
23:52 – Q7 What is polymorphism and what types are there?
26:47 – Q8. What is method overloading? How many ways can a method be overloaded?
30:41 – Q9 What is the difference between overloading and overriding?
34:45 – Question 10. What is the difference between overriding and hiding methods?
37:37 – Q11 What are the advantages and limitations of OOPS?
41:31 – Q12 What is the difference between an abstract class and an interface (at least 4)?
46:45 – Question 13. When do you use an interface and when do you use an abstract class?
50:39 – Q14. Why create interfaces at all?
54:38 – Q15. Can interfaces have a constructor?
56:17 – Q16. Can you create an instance of an abstract class or an interface?
58:54 – Question 17. What are access specifiers? What is the default access modifier in a class?
03:47 – Q18. What is boxing and unboxing?
01:06:35 – Question 19. What is the difference between “String” and “StringBuilder”? When is each used?
01:10:12 – Q20. What are the basic string operations in C#?
01:12:56 – Q21 What are nullable types?
01:14:42 – Q22. Explain generics in C#? When and why are they used?
01:20:18 – Q23. How do I implement exception handling in C#?
01:24:05 – Q24. Can we execute multiple catch blocks?
01:25:35 – Q25. What is a finally block and give an example of when to use it?
01:27:22 – Q26. Can we have only a “Try” block without a “Catch” block?
01:28:45 – Q27. What is the difference between “throw ex” and “throw”?
01:33:14 – Q28. What are the types of loops in C#?
01:37.04 – Q29. What is the difference between the statements “continue” and “break”?
01:40:52 – Q30. What is the difference between Array and ArrayList (at least 2)?
01:43:39 – Q31. What is the difference between Arraylist and Hashtable?
01:45:23 – Q32. What are collections in C# and what are their types?
01:48:49 – F33. What is IEnumerable in C#?
01:52:15 – Q34. What is the difference between IEnumerable and IEnumerator in C#?
01:55:06 – Q35. What is the difference between IEnumerable and IQueryable in C#? Why use IQueryable in SQL queries?
01:58:30 – Q36. What is the difference between the parameters “out” and “ref”?
02:05:06 – Q37. What is the purpose of the keyword “params”?
02:07:04 – Q38. What is a constructor and what types are there?
02:17:59 – Q39. When do you use a private constructor?
02:19:27 – Question 40. What are extension methods in C#? When are they used?
02:24:53 – Q41. What do you mean by delegation? When are they used?
02:29:35 – Q42. What are multicast delegates?
02:34:23 – Q43. What are anonymous delegates in C#?
02:36:37 – Q44. What are the differences between events and delegates?
02:40:28 – Q45. What is the “this” keyword in C#? When is it used?
02:44:09 – Q46. What is the purpose of the using keyword in C#?
02:48:42 – Q47. What is the difference between the operators “is” and “as”?
02:52:09 – Question 48. What is the difference between “read-only” and “constant” variables (at least 3)?
02:57:35 – Question 49. What is the static class? When is it used?
03:00:26 – Question 50. What is the difference between “var” and “dynamic” in C#?
03:03:17 – Q51 What is the Enum keyword used for?

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