Author: Anonymous

There are numerous DBMSs in use today and Visual C# can interact with many of them.

If you want to create an abstract read-only property, leave out the set accessor.

If class B is derived from class A, the methods in class B cannot access fields in class A that are declared protected.

Only methods in a derived class can directly access the base class’s private members.

You can think of a derived class as an extended version of some base class.

Assume you have written a ToString method in a class, and created an instance of the class named object1. The following two statements are equivalent:MessageBox.Show(object1);MessageBox.Show(object1.ToString());

A method can return a primitive value or a struct object, but it cannot return an object that is an instance of a class.

To make a property read-only, omit the set accessor for the property.

If a reference field is declared as readonly, it is guaranteed that the values of the properties and or fields of the object that the field refers to cannot be changed.

The keyword this is the name of a reference variable that an object can use to refer to itself.