I find this table from MSDN to be useful to explain differences between shadowing and overriding: The main constraint on overriding is that it needs permission from the base class with the 'overridable' keyword. Shadowing does not require permission of base class.

Criterion Shadowing Overriding
Purpose Protecting against a subsequent base class modification introducing a member you have already defined in your derived class Achieving polymorphism by defining a different implementation of a procedure or property with the same calling sequence
Redefined element Any declared element type Only a procedure (Function or Sub) or property
Redefining element Any declared element type Only a procedure or property with the identical calling sequence1
Accessibility Any accessibility Cannot expand the accessibility of overridden element (for example, cannot override Protected with Public)
Readability and writability Any combination Cannot change readability or writability of overridden property
Keyword usage Shadows recommended in derived class; Shadows assumed if neither Shadows nor Overrides specified Overridable required in base class; Overrides required in derived class
Inheritance of redefining element by classes deriving from your derived class Shadowing element inherited by further derived classes; shadowed element still hidden2

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