1.What is difference between abstract class and interface?
2. What is difference between interface and class?
3.what is difference between string class and stringbuilder class?
4.what is remoting?
5.What is difference between remoting and web service?
6.Can web service method return hashtable?
7.What is boxing and unboxing?
8. What is value type and reference type?
9.Is string is reference type or value type?
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