It was quite a long interview started from OOPS/.Net/C#/SOLID/Design patterns/.NetCore/WebApi/SQL.. for each and every section mentioned above, you have to write a code snippet or you have to find output for the program(they have a bunch of interview questions taken from SQL interview/c# interview questions from google).. One suggestion is you can create your own interview questions for the Interview instead of searching from various websites and seems the Interviewer is expecting that you have to know everything like him..