NGWS SDK Documentation  

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4.9 Variables

A variable stores values of a particular type. A variable may or may not have a physical storage location associated with it. Visual Basic 7.0 is a type-safe language, which means that every variable in a program has a type and the language guarantees that values stored in variables are always of the appropriate type. Every type has a "default value" which variables of that type that represent storage locations are initialized to before any reference to the variable can be made. For a variable of a value type, the default value is the result of initializing each field to the default value of its type. For a variable of a reference type, the default value is Nothing.