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.Net Faq's
Enum are used to define constants.
A DataSet is an in memory representation of data loaded from any data source.
Private : The private keyword is the default access level and most restrictive among all other access levels. It gives least permission to a type or type member. A private member is accessible only within the body of the class in which it is declared. 
Public : The public keyword is most liberal among all access levels, with no restrictions to access what so ever. A public member is accessible not only from within, but also from outside, and gives free access to any member declared within the body or outside the body.
Polymorphism means one name, multiple forms. It allows us to have more than one function with the same name in a program.It allows us to have overloading of operators so that an operation can exhibit different behaviours in different instances.
A jagged array is an array whose elements are arrays.
The elements of a jagged array can be of different dimensions and sizes.
A jagged array is sometimes called an array-of-arrays.
An abstract class is a class that is designed to be specifically used as a base class. An abstract class contains at least one pure virtual function.
When overriding a method, you change the behavior of the method for the derived class. Overloading a method simply involves having another method with the same name within the class.
An argument passed to a ref parameter must first be initialized. Compare this to an out parameter, whose argument does not have to be explicitly initialized before being passed to an out parameter.
The using statement is used to obtain a resource, execute a statement, and then dispose of that resource.
Serialization is the process of converting an object into a stream of bytes.
De-serialization is the opposite process of creating an object from a stream of bytes. Serialization / De-serialization is mostly used to transport objects.