3 rounds - 1 Technical, 2 Technical + Manager Round, 3 HR (not yet scheduled for me, so can't post questions). Both the rounds focusing more on technical skill set and real time problem solving. Second round the interviewer is also sharing what he answer he was expecting which is a good learning.

Difference between struct and class.

How you stop a class to get inherited apart from static and sealed keyword.

How serialization works, why we use it?

If there are multiple instances or machines where client using the same database, how you are managing it? How application deployment happened to different client machine for win form application where the dlls are locally copied.

If one customer wants a change out of 50 using the same application what all steps you do?

How you improve SP performance?

What are different in different DBs?

What are major challenges to migrate the huge DB to a different DB, example SQL to Oracle or Oracle to PostGreSQL.

What is the difference between CTE, Temp table, normal table.