1st round 1. Basic OOPS concepts(propose of each concept) 2. Delegate and its types in example to code. 3. Difference in var and dynamic. And some basics questions on SQL joins and C# 2nd Round 1. What is the Life cycle in ASP.Net? 2. What is Mutable and non Mutable in C#? 3. What is Hash Map and Hash table? 4. SOLID Principles (specifically Interface Segrigation priciple) 5. What is User control, view state, state management, CICD, extension methods? SQL: 1. Aggregate functions, all types of joins, CTE 2. What is cluster index and non cluster index 3. Difference in stored procedure and functions?

What is the difference between SingleorDefault and FirstorDefault in C#?