NGWS SDK Documentation  

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4.2 Inheritance

An inheritance relationship between two types is one in which one of the types derives from the other type, the latter type being called the base type. In general, a derived type's declaration space implicitly contains all of the accessible type members of its direct base type, except for the base's constructors. Some important aspects of inheritance are:

Visual Basic 7.0's type system is unified in the sense that all types must have a base type, except for the type Object. Thus, Object is the ultimate base type of all types, and all types can be converted to it.