A .NET application requires a set of special components that let it connect to and work with a database.

If a particular column is not allowed to be null, any time you add a row of data to the table, the DBMS will require a value for the column.

When you place a data-bound control on a form, you should keep in mind that Visual Studio does not automatically generate the code needed for the control to display any data from the database table.

To bind a ListBox control to a column, you must set either the DataSource property or the DisplayMember property but not both.

Assume that class B is derived from class A, and method M has a class A reference variable as a parameter. This means that method M cannot accept a reference to a class B object as an argument.

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

When developing applications that work with an intensive amount of data most developers prefer to use a database management system.

When program code instantiates a derived class object, the base class constructor executes first, followed by the derived class constructor.

Properties in a base class can be overridden in the same way that methods can be overridden.

An extension method is a static method that extends an existing class or data type.