ASP.NET

Difference between Shadowing and Override in C#

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	Overriding element inherited by further derived classes; overridden element still overridden