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1.class,object,(encapsulation,inheritance,polymorphism,abstraction)(4 P)imp
2.interface vs absctract class
3.reflection 
4.generics,deligates?(multicast deligates)
5.enum
6.constructor and types()
7.distructor
8.method overloading(erarly, static binding) and overriding(late and dynamic binding) 
9.constructor vs method
10.method sign (return type not a part)
11.virtual , abstract, sealed,static keywords
12.ref, out, value,  param (method parameters)
13.datatype|(value type,ref type)
14.acces specifer|(5types)
15.list, stack, queue,dictionary, array
16.multi threading 
17.struct vs class
18 assembly, namespace

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