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Top 100 C#/ .NET/ Web API/ SQL Interview Questions
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- Опубликовано: 13 авг 2024
- 1. Full .NET Interview Course (with PDF Book)
C# / ASP.NET Core / MVC / API - Top 500 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?
01:42:38 - Q59. What are the different Session state management options available in asp.net?
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.
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.
Thanks Danesh. Never got such appreciation even from my managers in past :). Deeply elated by it.
Bruh hats off it’s a developer Power Nap superbbbbbbbbbb❤
Please create java interview questions series
Is it use for 2 years of experience?
@@interviewhappyhi want to connect to you.
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.
Hii....can you do suggest me any other videos have you watched and please share your interview experience aswell....
Hey having experience or as fresher it helped you
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.
Yes correct
I almost wrote a comment about this, but you were quicker :) actually 10 months quicker
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.
really your work is amazing
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.
Thank you for answering ‘ why to use’ rather than just the concept. Helpful course . I also bought 500 questions that was also useful!
I got the Job, i am only prepared this question s only..... Thank u Very Much Excellent Video....❤️
Congrats Amani... That's what my main purpose is. All the best for your career.
@@interviewhappy Thank you Very Much But now i want Angular and React js please Suggest On that also....🥰
@@amanik2196 I’m also preparing for job. Can you tell what other videos you followed for cracking interviews? This video is only for C#. Can you suggest other videos for other technologies like sql, api etc
Really true
@@reshmaofficial9994 hey reshma you got the job?
There is one questions in video - What is the default access specifier of a class? The correct answer is internal.
Means if we don't declare any access specifier then it is the default internal 🤔
Exactly
How you made this mistake
@@Shubham-ic2rl everyone do mistakes ✍️
Tell me trucate can be rollback or not
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. 👍
A very complete .Net interview preparation I have ever watch on RUclips. Thanks so much.
Thanks Me Myself. Hope you will achieve what you are desiring.
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.
😊😊😊🙏🙏
Great Dheeraj, I am glad to hear that it is helping candidates. Might be interviewers are also watching this video for asking questions 😃
@@interviewhappy Yes Sir. 😊😊😀Seems they are also referring your videos 😀.
you applied as a fresher or experienced??
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.
Thanks Kimi. Loved your comment and wish you all the best for your interviews.
Great content sir, very helpful for interviews. Just one correction, "internal" is default access modifier for class and "private" is default access modifier for class members.
ya you are correct i also here for comment same mistake
In SQL, add few more as below I faced.
1.pivot table
2.dens rank
3.how to schedule a job in sql server
4.database optimize techniques
5.how to insert 1 lacks records. What are the scenario's you will follow. Can you please make video on these questions.. Thanks in advance
Which company they asked
Excellent video. I can see the hard work. The way document is prepared and each topic is explained. Kudos to you sir.
Please post 500 interview questions and answers in .Net. Your explanation is too good
I m very impressed with this video. Used very easy language with simple diagram. Good explanation. Keep it up with new videos
Thanks Jalpesh. Appreciate you liked it.
Nice explanation.. Can you share all 500 questions which in description below. So everyone benefits. Thanks again
It's Really Helpful for me to Creak the interview with Wipro , TCS , Cognizant and Capgemini
Thanks Pooja. I want to help all interview takers so that they can answer questions confidently.
Mashaa Allah Excellent effort
Unique video
Wow. This is a great material for the .NET interview prep. Appreciate your efforts for explaining each and every concepts in a short and concise way.
Glad it was helpful! @leetcodewithalishasharma
All good with Interview questions, but a lot of times day to day practical programming is very different from "best practices".
3 things so far:
1. in Interfaces you can declare methods, properties, events, and indexers not only methods.
2. You cannot have abstract keyword in an Interface. I get it its a copy paste thing but....
3. Public keyword in an Interface "is not aloud/is redundant" everything in an Interface is public.
To be clear, is a very helpful video Overall :D
Thanks Vasilis for bringing this things up. I will include them in the next version of this.
The never give up advice is too OP. Almost 15 interviews and still didn't land a job, was almost on the verge of quitting but this video was of great help and the small advice in the end was a booster. Thankyou
Keep going...
And when you reach your destination, you will feel proud of your never-give-up attitude and all the struggles you overcame.
All these rejections will be very small for you then.
Exllent video sir
I really happy and appreciate you 💞 I cracked 6 interview out of 10 in Dot net technology.. it's because of you Sir ❤ ..thank u so much sir ..🎉
Wow congratulations.. Thanks for sharing and appreciating my work .
All the very best my friend . @vinaychauhan5486
Default Access Modifier for class is Internal .
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
Now we don't have to watch different videos for every topic
I got job offer today after preparing for interview thurugh this video
I have given more then 10 to 13 interview and got offered today
Sir you are right
We should never give up
👍
All interview question and answer covering in this video. This video is help for us which is do preparation for interview. Thank you so much sir🙏. Only one problem here we can not seen proper example in mobile screen.
Yes, examples might not be properly visible in mobile screens. I will take of this from next time.
@@interviewhappy In Laptop Screen, All are properly visible.
Dear Sir,
you have mentioned that default access modifier of a class is private but in C# default access modifier of a class is Internal. We can only specify Internal and public access modifiers for class and for the class members we can specify all 5 access modifiers.
Thanks for the feedback. Yes, you are right. I will correct it soon.
Hello sir, firstly thank you for all videos !!
Please provide some interview questions on Xunit testing, how to explain logging and how to implement caching, Also commonly asked SQL & LINQ queries, some basic frequently asked C# codes like reverse a string and Fibonacci and more . Thank you again !
Thanks for making an amazing video.. It has covered all the questions..with Best Example.. Great work..✨👍🏻
Thanks Pooja.. I wish you all the best for your interview preparation.
"internal" is the default access modifier of the class not the "private" (go to time line 29:05)
Agree with you
Yes
Default access modifier for class is 'internal' and for class members it's 'private'.
Hi Happy Interview,
Thank you for this video; it is very helpful for our interview preparation. It covers all the important questions, each of which is commonly asked in many interviews. With the help of this video, I was able to brush up on my basic knowledge very easily and quickly.
If possible, could we have a video on interview questions for product-based companies?
Excellent... Its really helpful and iam searching to learn this important contents but i did'nt get any full package like this... But when i watch this video... my mind was fullfilled with the lots of hope and really satisfied by this. Thank you so much Sir
Thanks Anooja, glad you liked it. I wish you all the best for your career.
This is one of the best interview preparation video. Thank you so much for making this video
wc Sandhya and all the best for your career.
your content is really good..helped me in cracking job with MNC.keep doing such videos which are really helpfull for all..Thank you
Please make a video on scenario-based questions like if load time is more what to do like that. Thank you for great explanations.
At 2:05:50, its NOT Content-Type header, its Accept header. Accept header is used by HTTP clients to tell the server which type of content they expect/prefer as response.
Best video on youtube
Thanks and all the best for your career.
Very nice collection of interview question and very well explained. Thanks for creating this video. Keep doing the good work.
Thanks Satinder
Thank you sir, really helpful !!
wc Masquerade, wish you all the best
Sir, salute. Your videos are simply superb and yesterday purchased it. When I read ur tutorial I'm getting hope i will clear the interview. Thanks!!!
Thanks Pandi, yes sure. Cover important concepts first and try practice if time allows.
All the best for your career and interviews.
@@interviewhappy thank u sir!
📌Correction Access Specifier :- Default Access specifier for Class is Internal , For data members and method the default access specifier is Private
you are right
very very good sir... 100% useful for the interview... thank you sir
Most welcome Nikhil
Thanks you so much Sir😊
Effort was gr8 , only concern is Audio issue...
This is the best video of youtube
Thanks a lot Shubham
it is best video for .net interview.believe me
Thanks Avipsha. All the best for your interviews.
Suppose we are passing one class object as a parameter in the method
What is the difference if we pass with ref keyword like ref classname and and without ref keyword as class itself a reference type
Q 3 about Inheritance: The interface should use keyword of Interface (and not Class), right?
C# 8.0 had introduced a feature called "default interface methods," which allows interfaces to contain method implementations. This feature enables you to add new methods to an interface without breaking existing implementations.
Default accessspecifire for the class is internal not private
Thank you so much. This is what i need. Amazing collection of questions with great explanation.thanks again😊
wc Balaji
Sir, In Question 15 (29:00 minutes), Internal is the default access modifier of a class as classes can have only Internal and Public access modifier.
One of the best video i have seen explained each answer very clearly, thank you so much for your hard work ❤❤❤
Thanks Shiva. All the best for your career.
Best study content I have ever seen.Thanks much..
Welcome Suriya!
And this is one of the best comments I have seen.
Many Thanks for this.
And best of luck for your interviews.
Fantastic work 👍
Thanks Vishnu. Wish you all the best for your career.
This is best .net interview questions collection.Last time I secured 4 offers after watching videos this time again i am back here , hopefully to secure better opportunities again .Thank you so much 🙏🏻 I rarely comment on social media but you deserved to be appreciated 👍🏻
All the best
Awesome video to quick help for interview preparation at last moment
Thanks Manisha, glad you liked it
Awesome presentation seriously our life is very happy if we go with the stuff great work sir keep it up and any plans for Azure!
Thanks Vasu. Yes Azure, Angular, React are in my plan.
I have been searching for this kind of explained video from long..it is truly very very helpful video as it covers all the important questions that is being asked actually...thanks a lot sir for making this video.. I m going to save it for me for my upcoming interviews.. btw it not only covers the interview qsn but also it clearing some of my concepts.. thanks a lot for making such video.. also request u to make a video on dot net core.
Thanks Bharti for your words. These kind of words motivate us to create more and more valuable content. I am glad you liked it. I wish you all the best for your career.
Default access modifer of class is internal not private . Video is good 👍.
What are design patterns in c#? Could you please ping the video link if you know which will help me to understand the concept clearly?
This is the best best video. Thanks a lot🙏
Thanks Pooja. Best of luck for your interviews.
you should have 100k subscribers
Thank you so much. Love this.
Thank you soooooo muchhhh for informative questions and answer you taught smoothly nice and got understanding all things easily please make more videos for helping ppl ...thanks alot dear sir
Thanks for your words Yaslin. I will keep posting things which help candidates in clearing interviews.
So helpful thank you so much .. can you also create one video for programing coding interview question asked in c# .net interview
wc Shreya, coding questions are common but I will try to include them... wish you all the best.
Nice clear explanation
Thanks Monika. All the best for your career.
Amazing Brother! Keep up the good work! You are getting people jobs! Hope I get that one tomorrow too lol 😀
That is my objective. Learn but with goal. I wish you all the best buddy. Give your best.
Thank you for this video.. It's very helpful for me..and ur way to describe is very good..🙏
Thanks and all the best.
[29:06] Default modifier for a class is Internal, NOT private
Amazing video, very helpful.
Thanks Vinod.
Really Helping video...It's Wonderful ...Thank You Sir
Welcome Sarwar. Appreciate your desire for learning.
In the Interface & Abstract, you have mentioned an abstract method in interface at 18:18, can we really have an abstract method in interface. I thought all the methods declared in an interface are by default abstract methods and we shouldn’t be using abstract keyword.
Very good explanation.
Thanks Jinosh, My focus is to give answer which will clear the basics and should be short and concise.
Hi Happy,
Well explained but design patterns is missing which is very imp topic in the interview.
Could you please explain that topic with example.
Thanks for making an amazing video
Thanks a lot sir. Am preparing for interview it is very helpfull.You are explaining very clearly and GREAT
wc Vishnu. I wish you all the best for your interviews.
@@interviewhappy Thankyou Sir
It's really really very helpful ..... ThankQ soo muchh sir for this wonderful video
Thanks Akanksha... I wish you all the best if you are preparing for videos.
Extremely useful video. Thanks for uploading it!
Thanks Nadarajan. Wish you all the best for your career.
Sir Jee... All in One bana diya Aap neee.... Thanks
Such a knowledgeable video
Thanks Nidhi. All the best for your career.
Thank you so much for sharing this video . This is one of the best interview prep video. Can I please ask you to explain SSO ?
Welcome and Thanks Komali. Wish you all the best for your career.
SSO is Single Sign On like you login in gmail in google, then you need not to login in other google apps - youtube/ drive etc... that is SSO.
In .NET it is related to authentication and access tokens. I will soon try to make an video on it.
Good attempt..... Thank you.....You spread your knowledge............... thanks alot......
Thanks Mr. A
@@interviewhappy i am not Mr....... i am Mrs.....
@@user-qh7er8fp2o Oh my bad.. Sorry
very useful. thanks for posting.
Thanks Anubhav and all the best
Very excellent notes and explanation. Keep rocking.. Do more videos.
Many Thanks
Thanks for the video. Any pointers to learn and master design patterns ? Thanks
Thanks and all the best for your career.
Very very nice questions sir, please keep posting on other important topics also in. Net. Thank You
Thanks Sreeni. Appreciate you liked it
I am so nervous and feeling underqualified - i hope this goes well.
I passed a sample test but i think im most nervous about blanking on a specific question i dont have memorized, even though i can easily discover the answer and understand it utilizing my resources.
wish me luck
Don't worry Lebron, Its normal and it happens with everyone.. with me also. Let me tell you what I do... Note all questions(not answers) in a excel. Then check them daily and think about their answers. Randomize them and those which are memorized 100%, filtered them out. One day all will be filtered out.
Best of Luck GOAT
This is really super sir, please keep creating videos. These are helpful
Thanks Nikhila. I wish you all the best for you interview preparation.
It is really very useful video for interview 👍
Thanks Monika, all the best for your career.
How we can connect from c# to database? can you please provide possible answers for this questions it is asked in many interviews
Hi Ponram, 3 approaches - use ado.net or entity framework or linq to sql are used to connect C# to database. You can explain any one of them.
Hello sir your questions are really helpfull. I have one doubt in question no 15 of this video i.e default access modifier for class?
Your answer is private but it is internal right? Could you please explain me.
Mistake/Typo in question 3 (What are the different types of Inheritance?) Interface1 should be 'interface', not a 'class'
Thanks Alex for letting me know, unfortunately editing is not easy here.
PLease make a video on java interview question(100 ques) and another video on only for oops question(100)
Sir bhut hi accha explains kiya hai aapka.please Asp.net mvc and core series also
Thanks Himanshu
You are happy and makes other happy as well from ur knowledge and efforts.
when we preapre from your vedio and crack interview and got raised in salery we become also happy hehhe