There could be many thousands interview questions on .net and few of them are asked in different companies. I can say that there are some core level questions that repeated in interviews and almost each company.

For SQL top 10 interview questions, please refer my previous blog http://www.c-sharpcorner.com/Blogs/9493/top-10-interview-questions-asked-for-dot-net-developer-posit.aspx

Generally about 10 questions are asked from different section of .net. and I am here to just summarizing them category/section wise. Hope it may be help you out to get your desired job.

1. CLR and CTS,CLS related question

o What are the important roles of CLR ? How CTS and CLS differ?

2. GC(Garbage Collector) related

o What is Garbage collector and how it works?

o What are the different phases in GC and how it works?

o How to force to run GC? What is managed code?

o When you use Window API, it is managed or unmanaged code?

3. Assembly related

o What is dll hell? What is Assembly and how a global assembly is created?

o How Assembly is differing from Namespace?

o Can we see Assembly?

o What is Manifest?

o How versioning is maintained?

o What is GAC and how it is maintained?

o What is Delay signing?

o What is Reflection?

o What is satellite assembly?

o What is NGEN.exe?

4. Value type and Reference type related

o What is Boxing/Unboxing?

o What are Value types and reference types?

o What is CodeDom?

o What is IUNKNOWN interface?

o Difference between Ref & out

5. Exception handling and Logging related

o Difference between System exception and Application exception?

o How to know the reason of exception being occurred for a particular user and what action you would to take to fix that.

6. Data handling and Controls related

o What is connection pooling

o What is different type of data controls

7. Life cycle and basics related

o HTTP Handler, Module

o Order of execution of Page_Load event in content page with master pages, user control pages.

o PostBack and Async PostBack and UpdatePanel

o Dynamic controls

o What are .pdb files

8. Authentication modes

o Different session management for not loosing state/session.

o How Security is maintained

9. Controls & Accessing controls values related

o How to access Html control values at server side(code behind)

o How to access User-control / Master page ‘s control from content page

o How to access Content page's control from Master page

o Difference between UserControl & CustomControl

10. Data transfer over pages related

o Different ways of transferring user data over pages

§ Client Level

§ Server Level

o Transferring control and their difference ( Server.Execute, Server.Transfer, Response.Redirect)

Best of Luck!!!:)