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16.	What is the use of Internal keyword?
	Internal keyword is one of the access specifier available in .Net framework , that makes a type visible in a given assembly , for e.g : a single dll can contain multiple modules.
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17.	What is the difference between the Debug class and Trace class?
	Use Debug class for debug builds, use Trace class for both debug and release builds.
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18.	What are class access modifiers?
	Access modifiers are keywords used to specify the declared accessibility of a member or a type. This section introduces the four access modifiers : Public Protected Internal Protected inertnal Private
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19.	What is portable executable?
	The file format used for executable programs and for files to be linked together to form executable programs.
	Discuss Sonia Varma, says Sep 23, 2014 In early binding, the binding of a method is decided at compile time but in late binding decision of binding is taken at runtime. Late binding implements dynamic polymorphism. Your Name Your Email-ID Your Answer

20.	What is the difference between System.String and System.StringBuilder classes?
	System.String is immutable, System.StringBuilder was designed with the purpose of having a mutable string where a variety of operations can be performed.
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