Top 20 Interview Questions - Web API - .NET C#

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Video In HINDI
Top 20 Interview Q/A WEB - API
• Top 20 WEB API Intervi...
This video contains top 20 questions asked in interviews from Web API topic.
00:00 - Introduction
01:03 - Q1. What is Web API? What is the purpose of Web API?
02: 06 - Q2. What are Web API advantages over WCF and web serivces?
05:31 - Q3. What is Rest and Restful?
10:37 - Q4. Is it possible to use WCF as Restful services?
10:52 - Q5. What are HTTP verbs or HTTP methods?
13:06 - Q6. How to consume Web API from a .NET MVC application?
17:07 - Q7. What is the difference between Web API and MVC Controller?
18:25- Q8. What is Basic Authentication in Web API?
20:11 - Q9. What is API Key Authentication in Web API?
21:14 - Q10. What is Token based authentication?
24:19 - Q11. What is OAuth?
25:29 - Q12. What is JWT Authentication?
27:06 - Q13. What are the parts of JWT token?
30:04 - Q14. Where JWT token reside in the request?
31:16 - Q15. How to test Web API? What are the tools?
31:47 - Q16. What are main Return Types supported in Web API?
32:45 - Q17. What is the difference between HTTPResponseMessage and IHttpActionResult?
34:57 - Q18. What is Content Negotiation in Web API?
36:48 - Q19. What is MediaTypeFormatter class in Web API?
38:22 - Q20. What are Response Codes in Web API?

[@rakeshs5418]

Very helpful and I have faced every question in this list in interviews. Keep doing more videos on advanced topics.

[@interviewhappy]

Thanks Rakesh.. Yes, the purpose is to learn the most important questions first. Mostly we learn things randomly which are not even asked in interviews.

[@IMRANEize]

Thank you for this awesome content, greeting from Morocco!

[@good4yoearsproduction465]

Deserves a million views! 😇

[@interviewhappy]

Thanks a lot

[@abhishekanand6591]

Superb explanation on how to consume web api from mvc application. Many thanks!

[@emmaaboukasm9318]

Thank you for this! Very clear and concise explanations

[@interviewhappy]

Glad it was helpful! @emmaa

[@MyCollection2103]

I am pretty much happy to come across this series which is very useful, most of my doubts are cleared without going through complete concepts. My humble request is to create a series on Complete Design patterns and Azure Pass Developer concepts. these are the one where we don't get any one-stop destination

[@interviewhappy]

Thanks Renuka, sure soon I will create.

[@martinlabastie.p9940]

@@interviewhappy ufff adessisng patterns series would be AMAZING!

[@Angeluslove7]

As always, great stuff. Keep doing more. This content is not just for interview prep but also to refresh your basics. Thank you.

[@interviewhappy]

Thanks, will do!

[@balindrakumarsingh7268]

very good content

[@raabelkothari3060]

I just forget to say thanks to get my last job as a Software Engineer by watching your interview preparation videos around .NET and Angular, today i'm again revising for my interview which is scheduled for tomorrow so, i just had an thought to say very heartfelt thanks for my current job. Thanks Happy...!

[@interviewhappy]

Great to hear! Best of luck @raabelkothari3060

[@KirubasonEdwin]

Really I can feel your experience from the explanation. Even the top coaching center can not cover all this topic. Thank you so much. Keep going and support many developers:)

[@interviewhappy]

Thank Edwin.. You also keep growing in your career.

[@rajkumararora7366]

Thank you Happy sir. You are making everyone Happy with this amazing content... 🙂 Keep it up and keep updating. Good luck. Hope to see any more books and videos from you.. Thanks 🙂

[@interviewhappy]

Thanks Raj for such motivating words

[@Pooja-cj5lg]

Nicely explained.. Thank you so much.. it's very helpful..!

[@interviewhappy]

welcome Pooja, all the best for your career...

[@gkmishra2009]

Great

[@sameervishawakarma4236]

Great video, definitely helps to crack interviews. Thank you very much 😊

[@interviewhappy]

Glad it was helpful Sameer. All the best

[@nikhilvairat7400]

Very informative video thank you for the great content. We are expecting more video in advanced topic

[@interviewhappy]

wc Nikhil. All the best for you career.

[@KalaiSelvi-hz6fv]

All the videos are very useful to me..thanks alot..please please put more videos to learn more.

[@interviewhappy]

Thanks Kalai... Sure I will create more content on interviews.

[@imadabab]

Great video. Thanks a lot!!

[@user-xx5tb9hu1x]

Very helpful for me

[@s.s.vinodhvinu9698]

I'm Vinodh Shanmugasundaram here.Thank you sir, this video is very useful because you had given in a way so that a person can easily understand the questions and answers. Please keep going.

[@interviewhappy]

So nice of you and thanks S.S. Vinodh Vinu

[@velss2723]

Thank You sir ..Your contents are really good ..new subscriber from Chennai

[@ranjithkumarrepalle4147]

Thanks for your time to collected useful information..it saves my time

[@interviewhappy]

@Ranjith Your welcome and thanks for watching

[@sahilmansingh7930]

Thank you for this course :)

[@interviewhappy]

You're very welcome @ sahil

[@dips3122]

Very well explained. Help to understand concept easily

[@interviewhappy]

Thanks @dips

[@04mohjam]

Two clients are assessing same web API url but one client need the response in json format and other user needin XML format how we can implement?

[@praveens4770]

Wonderful answers and it's clear.👌

[@interviewhappy]

Glad you liked it Praveen. Wish you all the best for your career.

[@shangeet]

Your videos are good for quick revision. Thank you for it. Could you also make a series on BLAZOR interview questions. If needed I can share a list of BLAZOR interview questions that I have experienced. It will be helpful for quick review.

[@interviewhappy]

Soon I will try to cover it.

[@sabrinnisa5353]

Many thanks for your content , it’s very useful.

[@interviewhappy]

Thank you 🙂

[@ronitbarlavie]

Thanks a lot ! It helps a great deal :)

[@interviewhappy]

Thanks and all the best for your career.

[@vk8740]

Add deployment,TFS questions and explanations and frequently asked programs

[@sureshism9259]

Its very help ful and well explained thank a lot

[@interviewhappy]

Thanks Suresh. All the best for your career.

[@omarsadiq1623]

The great content. To the point and very helpful. Thanks Man.

[@interviewhappy]

Glad you enjoyed it @omarsadiq

[@prithivgk]

Saved my whole day, Thanks Happy

[@interviewhappy]

Glad I could help! Prithvi

[@sairao264]

excellent collection of questions, and you explained them very well. Thank you so much

[@interviewhappy]

Thanks Sai, my best wishes for your career.

[@sairao264]

@@interviewhappy i will be again very much thank ful to you if you please share a video of .net 6 mvc and webapi CRUD operations.

[@sairao264]

@@interviewhappy Thank you

[@interviewhappy]

@@sairao264 yes sure, some bandwidth issue but soon I will cover it.

[@sairao264]

@@interviewhappy Thank you

[@beyond_akshii]

Thank you❤

[@omsingh-uo7mt]

Very nice videos...very much simple and clear. Will you please create a videos for different token based authentication and authorisation in web api and MVC.

[@interviewhappy]

Sure Om, soon I will

[@rishikeshsonar3743]

This is really helpful

[@interviewhappy]

Thanks @ Rishikesh Sonar

[@shashankracharya7931]

Wow it just worked I was on my way to comment that it was BS... thanks man

[@interviewhappy]

welcome Shashank

[@debojitsaha8246]

make more videos ..Your content is useful to many

[@interviewhappy]

Thanks Debojit.. will surely do

[@DheerajKumar-xr6ud]

Thank you for sharing. It is very good.

[@interviewhappy]

Thanks Dheeraj. Wish you all the best for your career.

[@iamjithu100]

Great video and much informative

[@interviewhappy]

Glad you enjoyed it @jithu

[@amardeepdharwan1083]

Very good happy nice topic

[@amardeepdharwan1083]

Your speaking style is so good anyone can easily understand and easily learn

[@interviewhappy]

That is my goal Amardeep. Looks I am coming close. Wish you all the best for your career.

[@ayeshashaheen3723]

Hi @interviewhappy sir, In interview I came across a question like how to store a json format data in database? please explain this question

[@subh2k5]

Appreciate your hard work!. Liked and subscribed your channel.

[@interviewhappy]

Thanks

[@vishalsrivastava6349]

Very good and informative

[@interviewhappy]

Thanks for liking Vishal

[@vijaydeshmukh1082]

Great 🔥

[@interviewhappy]

Thnx Vijay

[@Anachoreteee]

Useful! Thank you! :)

[@interviewhappy]

Glad it was helpful @Anachoreteee

[@anuragmohanty1238]

Awesome

[@interviewhappy]

Thanks Anurag

[@ratanmishra3513]

thank you very helpful....plz include Request/Response Header and Request/Response body questions also

[@interviewhappy]

wc and sure Ratan, I will do it soon

[@sajusebastian4740]

Thankyou soo much Sir Really greatful to you

[@interviewhappy]

Thanks Saju. Wish you all the best for your career.

[@kpadhnan]

Thanks for the video

[@interviewhappy]

we Adhnan.

[@berginsheni1717]

Where the token is saving and how we are validating against it from up coming request ? Please give some clarity on this

[@manjunathbadiger57]

Nice Thanks a lot

[@interviewhappy]

Welcome! Manjunath

[@04mohjam]

Hi sir, If 1000 people consuming same web API How it is serving scure and faster?

[@ishukumar]

Accept header specifies that in which format the client is expecting the response from the server, isn't it? The content-type header only specifies the media type of the request body which we are sending to the server from the client.

[@manalivarshney1901]

Great videos

[@interviewhappy]

Glad you like them! manali

[@rrk9964]

THANKS SIR

[@interviewhappy]

Welcome. All the best for your career.

[@user-io5hg1jn8i]

make video on jwt interview questions?

[@PrernaDubey-wb9tp]

how to support different format returns(xml/json) in web api ?

[@abiramiharidass1075]

It's really awesome and helping me a lot to prepare for interview. Can you please post Videos related to Design Patterns and SOLID Principle?

[@interviewhappy]

Thanks Abirami. Will share soon.

[@abiramiharidass1075]

Thanks.

[@umamaheswari8805]

Thank you so much 🙏

[@interviewhappy]

You're welcome 😊@umamaheshwari8805

[@user-io5hg1jn8i]

JWT Alg type? jwt claims? can decrypt token if hacker knows alogithm?

[@latakanyal5431]

What is cors in web api is not added. Please do cover this also

[@ranjithkumar4170]

Nice

[@interviewhappy]

Thanks Ranjith

[@sharadap83]

Very helpful and explained

[@interviewhappy]

Thanks Sharad. Wish you all the best for your career and interviews.

[@sharadap83]

@@interviewhappy preparing for interviews, want to try for FAANG

[@interviewhappy]

@@sharadap83 that's a great idea, Give more focus to algorithms and data structures then. Slightly different preparation from normal .NET interviews.

[@sharadap83]

@@interviewhappy thank you for your technical support. Can you suggest any cloud certification

[@interviewhappy]

@@sharadap83 Bro focus on one thing first - Cloud or FAANG. If Cloud, then go for Azure(.NET compatible). First checkout free Azure trainings. If you are good, then go for Azure Developer certification(if you are a developer) and choose some best paid trainings(up to you).

[@akg_akgoud]

Since web api is stateless. How we maintain state between requests

[@user-io5hg1jn8i]

acccess token and refesh token related interivew questions?

[@iamsiddu410]

Happy happy happy , happy happy happy happy happy

[@interviewhappy]

Thanks Siddu Siddu Siddu Siddu Siddu Siddu

[@mocococo2877]

Greetings from Bulgaria and Thank You. All the best to you too. I am not sure but I think that 3xx Redirection is when a user is using an old link which is no longer available or the content is moved to e new page then we still want to catch the user but redirect him / her to a different page on our site. That instead of scaring him with 404 Not Found.

[@interviewhappy]

Greeting from Inida. Good catch bro.

[@korimisrikanth6139]

Please do more videos for learning

[@interviewhappy]

Sure Srikanth... More videos are in pipeline

[@vk8740]

Please post the programms which asked frequently in interview in C#

[@interviewhappy]

Sure VK I am in process of making more content related to interviews.

[@Allinone-os5qo]

Please share top 500 .net interview question here

[@2784raj]

You are awesome sir...

[@interviewhappy]

Glad you liked it Raj

[@aparnamishra1530]

Guru🙏

[@rameshbusara6406]

Could you please provide SignalR video with brief explanation and with live example

[@interviewhappy]

As I said, as a fresher there will be struggles and you are not alone. Have patience, keep on trying and never ever give up.

[@somachakraborty5049]

Can you please make a video on Async and await

[@interviewhappy]

Sure, soo I will.

[@sharadmishra4638]

if we are not defining httpverbs and change method name to post in web api ? Could you please help me with this ans

[@interviewhappy]

Hi Sharad, then your httpverb will be Post. If you not defining httpverbs then your method prefix will be the httpverb. For example, for "getproduct" method, "get" will be the httpverb .

[@User-Dotnet]

Hi Happy please make Vedio on SOAP and Explain Different between REST and SOAP

[@interviewhappy]

Good question I missed that, soon I will try to cover it.

[@sgssergio]

I Agree, at this moment the New web api are Rest, gRpc or web socket but the old Soap protocol is applied several years for thounsands of sistems, active sistema

[@pallavipawankar9705]

Could you please create sessions on Azure topics and consolidate?

[@interviewhappy]

Sure soon I will

[@sandeepmishra5541]

i have to payment one time but I can't get please guide me how can get

[@amitkumarpai3774]

Your c# interview questions is the best video so far....It one stop for c# interview preparation.. But in this video you not so good in communicating the answers very effectively for the answers which you are not aware.. sorry about it but it is my frank opinion

[@jadirajkumar265]

Hi sir can you please share brief description about oauth2 authentification and authorization i am going to attend interviews please share as soon as posiible please

[@interviewhappy]

When you do authorization for any application then you have to follow a set of rules and those rules or standards are called OAuth. All the best man.

[@alessandrovangeli8395]

hello, in my experience also wcf can be used by mobile app

[@interviewhappy]

Yes I think, me long untouched with wcf.

[@konidinasandeep]

I bought your course in Udemy sir. Is there any course available for fullstack with angular?

[@interviewhappy]

There is a course for .NET + Angular but again that is a combination of interview questions.

[@sandeepmishra5541]

i am intersted for complete ebook interview question how can do please guide

[@interviewhappy]

Sure Sandeep.. Below is the link but it is paid.. imojo.in/interviewhappy

[@aslafshaikh1308]

Is that only for. NET and C# ? can i use this questions for java based interviews?

[@interviewhappy]

Yes API's are also there in Java. Even the syntax of C# is 99% similar to Java

[@rohitdasu5845]

❤

[@tharunbhavani181]

Hi the same questions are similar with postman api also ? Can you please reply me

[@interviewhappy]

What is the question... Postman is just a tool to test the API.

[@tharunbhavani181]

@@interviewhappy webservices api also same as web api

[@divakardhande8921]

Sir one interviewer asked if u can add record using put method then what is use of post delete record using get then what is the meaning get

[@interviewhappy]

The PUT method is used to update or replace an EXISTING record. Post is used for creating NEW record. Technically we can use Put method for adding new records, but that should never be done, it will create confusion. All the best for your interviews

[@AmirOveisi]

Isn't WCF a type of Web API? like SOAP API is a Web API and REST is a Web API? it was better to compare REST API against WCF.

[@interviewhappy]

In short, WCF is bit complex than web API's

[@64-rlatha.v93]

explain curd operations sir?

[@interviewhappy]

I will try in future.

[@sandeepkumarkonidina5859]

I bought your course on Udemy, where is the pdf available? Please help me find that , i searched a lot

[@interviewhappy]

Hi Sandeep, you can ask me there... It was attached in the introduction section.

[@GoodWayTours]

What are the error handling method in web api

[@interviewhappy]

Here are 5 things you should do to handle error properly in web api: 1. Log errors 2. Use try-catch blocks 3. Use proper HTTP status codes 4. Return meaningful error messages 5. Implement global exception handling

[@kandycan]

Internal server error means, backend developer made a mistake. Most probably.

[@harikrishna6944]

Can you give training on .NET to the freshers?

[@interviewhappy]

Hi Hari, That is one thing which I want to start as early as possible.

[@harikrishna6944]

@@interviewhappy If you could provide any email or contact, it will be helpful to discuss with you regarding training on .NET Technologies. Please.

[@spicyfish01]

how do i get pdf copy of the interview questions?

[@interviewhappy]

Hi Spicy, I have mentioned the link in description but that is paid.

[@sakshid1724]

are these questions for freshers?

[@interviewhappy]

Hi Sakshi, these questions are for those who have some basic .Net project experience

[@manisekaranp]

At 42.21, you say after initial validation of user name password, web api starts a session. That is wrong. Web API are stateless always. Each request is on its own, Each request must send some sort of user name password, token, server-side cookie. WEB api does not ever start a session. It is totally avoided

[@ashleynayelyquezadaruvalca6931]

I want to buy the book but I am not from Indian. I am from México. How can I buy it?

[@interviewhappy]

Hi Ashley, you can mail me at [e-mail]

[@madhavikorlepara3417]

wha is API gate way and Microservice...can you answerer in the comment..

[@interviewhappy]

Hi Madhavi, for example you have a e-commerce application. Now instead of creating a single big API for backend, you create small small api's which can communicate with each other. This is microservice architecture. Now you will write security code(authentication) code in each of these small API's right? To make it simpler, you will create single API gateway where authentication will happen and code is not required in individual API's. APIM in Azure is the example of API gateway.

[@madhavikorlepara3417]

Thank you sooo much for quick reply... can you make video on Nunti Test project ..to test the application

[@interviewhappy]

@@madhavikorlepara3417 sure soon I will

[@anusha933]

Hello Happy sir, I am not able to see your Udemy lectures through my Udemy organisation account. Kindly respond asap. Thank you.

[@interviewhappy]

Hi Anusha, I think Udemy has not enabled it for companies employees. Otherwise employees will get other better job. Right ;)