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 sequence¹AccessibilityAny accessibilityCannot expand the accessibility of overridden element (for example cannot override Protected with Public)Readability and writabilityAny combinationCannot change readability or writability of overridden propertyKeyword usageShadows recommended in derived class; Shadows assumed if neither Shadows nor Overrides specifiedOverridable required in base class; Overrides required in derived classInheritance of redefining element by classes deriving from your derived classShadowing element inherited by further derived classes; shadowed element still hidden²Overriding element inherited by further derived classes; overridden element still overridden