Inheritance on static variables?

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How does one make a function in a base class slect the appopriate
version of an overriden static variable.

Code-splination follows:

public class letter
{
public static int PostCodeDigits = 4;

public void grow()
{PostCodeDigits++;}

public virtual void shrink()
{PostCodeDigits--;}

public virtual string desc()
{return PostCodeDigits.ToString();}
}


public class parcil : letter
{
public static new int PostCodeDigits = 8;

public override void shrink()
{PostCodeDigits--;}

public override string desc()
{return PostCodeDigits.ToString() + "!";}
}


Examble call:

letter a, b;
a = new letter();
b = new parcil();
Console.WriteLine("a = {0}, b = {1}", a.desc(), b.desc());
a.grow();
b.grow();
Console.WriteLine("a = {0}, b = {1}", a.desc(), b.desc());
a.shrink();
b.shrink();
Console.WriteLine("a = {0}, b = {1}", a.desc(), b.desc());

output:
a = 4, b = 8!
a = 6, b = 8!
a = 5, b = 7!

So shrink works, but grow only effects the base class.
It quickly becomes impractical overide all functions that asses the
overriden static feild.

Is there a way in c# to make the "grow function" work as per the shrink
function" without overriding it in all inherited classes.

.

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