.Net FAQ's
.Net Faq's
Access modifiers in C# are :
internal protect
Implicit conversion of value type to reference type of a variable is known as BOXING, for example integer to object type conversion. 
Conversion of reference type variable back to value type is called as UnBoxing.
An object is an instance of a class. An object is created by using operator new. A class that creates an object in memory will contain the information about 
the values and behaviours (or methods) of that specific object.
Jagged arrays.

An instance of a user-defined type is called an object. We can instantiate many objects from one class.
An object is an instance of a class.
A destructor is called for a class object when that object passes out of scope or is explicitly deleted.A destructors as the name implies is used to destroy 
the objects that have been created by a constructors.Like a constructor , the destructor is a member function whose name is the same as the class name but is precided 
by a tilde.
An enumerated data type is another user defined type which provides a way for attaching names to numbers thereby increasing comprehensibility of the code. The enum keyword automatically enumerates a list of words by assigning them values 0,1,2, and so on.
A constructor is a member function with the same name as its class. The constructor is invoked whenever an object of its associated class is created.It is
called constructor because it constructs the values of data members of the class.
The wrapping up of data and functions into a single unit (called class) is known as encapsulation. Encapsulation containing and hiding information about an object, such as internal data structures and code.
No,its impossible which accepts multi level inheritance.