VB.NET Overrides
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The term Overriding means to give a new function to an existing function,
thus replacing the function's old methodology.

WndProc
WindowProc (or window procedure) is a user-defined callback function that
processes messages sent to a window.

Here is more information on it:

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Protected Overrides

Can anybody explain to me what it means when a  subroutine begins with Protected Overrides ?

Protected sub can only be used by:

    

  1. Member functions of the class that originally declared the sub
    2. 

  2. Friends of the class that originally declared the sub
    3. 

  3. Classes derived with public or protected access from the class that originally declared the sub
    4. 

  4. Direct privately derived classes that also have private access to the sub
    5. 



Overrides:
Indicates that this Sub procedure overrides an identically named procedure in a base class 

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