Top 100 C#/ .NET/ Web API/ SQL 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 top 100 questions asked in .NET interviews.

00:00 – Introduction
01:04 - Q1. What are the advantages of OOPS?
02:47 - Q2. What are the limitations of OOPS?
03:32 - Q3. What are the different types of Inheritance?
06:45 - Q4. How to prevent a class from being Inherited?
07:36 - Q5. What is Polymorphism and what are its types?
08:12 - Q6. What is Method Overloading? In how many ways a method can be overloaded?
10:58 - Q7. What is the difference between Overloading and Overriding?
13:05 - Q8. What is the difference between an Abstract class and an Interface (atleast 4)?

15:23 - Q9. When to use Interface and when Abstract class?
18:59 - Q10. Why to even create Interfaces?
20:40 - Q11. Do Interface can have a Constructor?
21:05 - Q12. Can you create an instance of an Abstract class or an Interface?
21:29 - Q13. What is the difference between “out” and “ref” parameters?
25:27 - Q14. What is the purpose of “params” keyword?
26:28 - Q15. What are Access Specifiers? What is the default access modifier in a class?
29:11 - Q16. How to implement Exception Handling in C#?
30:16 - Q17. Can we execute multiple Catch blocks?
30:41 - Q18. What is a Finally block and give an example when to use it?
31:15 - Q19. Can we have only “Try” block without “Catch” block?
32:06 - Q20. What is the difference between “throw ex” and “throw”?
33:32 - Q21. What are the Loop types in C#?
35:20 - Q22. What is the difference between “continue” and “break” statement?
36:33 - Q23. What is the difference between Array and ArrayList (atleast 2)?
37:52 - Q24. What is the difference between Arraylist and Hashtable?
38:26 - Q25. What is “this” keyword in C#? When to use it?
40:06 - Q26. What is the purpose of “using” keyword in C#?
42:38 - Q27. What is the difference between “is” and “as” operators?
44:31 - Q28. What is the difference between “Readonly” and “Constant” variables (atleast 3)?
46:34 - Q29. What is Boxing and Unboxing?
47:50 - Q30. What is the difference between “String” and “StringBuilder”? When to use what?
50:16 - Q31. What are Nullable types?
51:21 - Q32. What are the important components of .NET framework? What are their roles?
54:22 - Q33. What is an Assembly? What are the different types of assembly in .NET?
56:41 - Q34. What is GAC?
57:04 - Q35. What is Garbage Collection(GC)?
58:44 - Q36. Can we force Garbage Collector to run?
59:26 - Q37. What is the difference between Process and Thread?
01:00:22 - Q38. Explain Multithreading?
01:01:40 - Q39. What is Reflection?
01:05:26 – Q40. What is MVC (Model View Controller)? Explain MVC Life cycle.
01:06:46 - Q41. What are the advantages of MVC over Web Forms (atleast 3)?
01:11:44 - Q42. What are the different return types of a controller Action method?
01:14:45 - Q43. What are Filters and their types in MVC?
01:17:23 - Q44. What is Authentication and Authorization in ASP.NET MVC?
01:19:10 - Q45. What are the types of Authentication in ASP.NET MVC?
01:21:50 - Q46. What is Output Caching in MVC? How to implement it?
01:23:45 - Q47. What is the difference between ViewData, ViewBag & TempData?
01:25:03 - Q48. How can we pass the data from controller to view in MVC?
01:25:22 - Q49. What is Partial View?
01:26:07 - Q50. What are Areas in MVC?
01:26:48 - Q51. How Validation works in MVC?
01:27:39 - Q52. Explain the concept of MVC Scaffolding?
01:28:38 - Q53. What is Bundling and Minification in MVC?
01:29:58 - Q54. How to implement Security in web applications in MVC?
01:35:44 – Q55. What are the events in Page Life Cycle? In which event are the controls fully loaded?
01:37:49 - Q56. What is the difference between Server.Transfer() and Response.Redirect()?
01:40:44 - Q57. Where the ViewState is stored after the page postback?
01:41:06 - Q58. What are the different types of Caching?
01 :43:50 - Q60. What are the main components of ADO.NET?

Maximum limit has reached for the description word limit, so more questions cannot be listed here.
I apologies for the inconvenience.

[daneshkumarsathyanarayanan]

This is really one of the best video for interview preparation, which covers all the aspects which is expected a .NET Technical Interview.. Hats off to the efforts for explaining the concepts more crisp and clear. Please continue your journey in creating such valuable videos.

[hhhhhchan]

Hi Happy. Spent a week to watch all your video for .NET interview. I got 2 offers in 2 interviews, a 100% successful rate. Thanks a lot for your help. Recommend for all the developers.

[srivanipatibanda]

Thank you for answering ‘ why to use’ rather than just the concept. Helpful course . I also bought 500 questions that was also useful!

[shubhamtaluja]

Thank you so much Sir for the valuable Interview questions. After struggling for 5 months, I finally secured a job. There were no questions which were asked that I felt was out of your video. To the point, crisp, and valuable. I recommend to everyone just make this guy popular because he's working so hard for us. Blessed.

[UttamLove]

29:00 - By Default access modifier of Class is 'Internal'. & 'Private' for Data Member n Member Function of Class. Internal is the default if no access modifier is specified.

[FunAndCreativeCorner]

Excellent video. I can see the hard work. The way document is prepared and each topic is explained. Kudos to you sir.

[kimicheng]

Super Super helpful. Selected questions are popular in the interviews and your answers are concise, on point and ez to understand. Thank you so much.

[souleimane]

A very complete .Net interview preparation I have ever watch on YouTube. Thanks so much.

[Factsnowwithdheeru]

Thanks Sir for sharing these type of interview questions, last saturday i attended a interview in Cognizant and they asked Almost all the questions which are available in this video, even I refered your SQL interview questions, there also I got multiple question, like Triggers, Index, Difference between SP, Function and many more.

😊😊😊🙏🙏

[goutamiponnada]

Thank you Happy sir! I have purchased 500 questions from Udemy on 8th April and gone thru the video for 1 time and 2 times pdf and 12th was interview and job confirmed on 13th. This videos is more than enough for anyone. I am joining after 4yrs career break. You made me happy. I explained Solid principles with examples for 2mins. You made everyone Happy. I also purchased Angular videos just before interview but couldn’t complete it. Thank you so much. Great efforts. 👍

[amanik]

I got the Job, i am only prepared this question s Thank u Very Much Excellent Video....❤️

[dr.jalpeshsolanki]

I m very impressed with this video. Used very easy language with simple diagram. Good explanation. Keep it up with new videos

[DK]

This is so wonderful! Thank you so much for this effort, this is probably the most complete video guide for C# I've ever seen, extremely helpful and well explained!

[poojatundalwar]

Thanks for making an amazing video.. It has covered all the questions..with Best Example.. Great work..✨👍🏻

[interviewhappy]

This channel mission is to help developers in getting BETTER JOBS. If my content helped you in achieving this, then do COMMENT on the video. This will MOTIVATE me to help others.

[damon-yimi]

annot put into words the amount of appreciation i hold for this videos' teacher ...god really bless u sir ..just once suggestion sir ..nowadays ppl are asking implement based questions more like how did u consume web api even for 2 yrs exp.kindly make a video like that too sir

[keerthanabalaji]

Thank you so much. This is what i need. Amazing collection of questions with great explanation.thanks again😊

[hafizmuhammadrizwan]

Mashaa Allah Excellent effort
Unique video

[NikhilD]

Nice explanation.. Can you share all 500 questions which in description below. So everyone benefits. Thanks again

[VaasirVibes]

Please post 500 interview questions and answers in .Net. Your explanation is too good