There were a lot of questions asked, so I will list the topic (and add a what is "topic" and know pros/cons). Extreme programming, what is a transaction, various SDLC design approaches, what is a namespace, define a good test case, what is a stored proc, webservice? design patterns? linker? compiler? access modifiers? stack vs. queue? arrays vs. linked lists? sorting algorithms? recursion? OOP principles?
1577An abstract class is inherited, an Interface also inherited(multiple inheritance), How it differences.
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What is ienumerable and iqueryable?
Is c# queue thread safe?
Explain how is the dll hell problem solved in .net?
What is the output of TextWriterTraceListener redirected?
What can I create with c#?
What are types of constructor?
Is string a class in c#?
What is the difference between values and reference types?
What are class fields?
Is overriding of a function possible in the same class?
Name the two classes are required for implementing a windows service?
What Is The Difference Between The System.array.copyto() And System.array.clone()?
What are the types of serialization?
What is wcf c#?
When would you use generics in your code c#?