... simple database access, oryou are creating middle-tier components to handle databaseaccess, understanding how to connect to a database, retrieveinformation, and manipulate data are critical to ... that is shared among all instances of a class. For example, you could create a property for a database connection string. Thiswill be the same for each class, so you can fill it in for one class ... MustOverridemodifier, that class must be marked asMustInherit. For example, here you have a base Transportationclass that has a method,Move,that is marked as MustOverride. This means that Transportationmust...