delegates and virtual functions

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Do delegates don't respect polymorphisms -- why?

say in this example:

using System;

public delegate string FirstDelegate (int x);


abstract class Base
{
public abstract string Foo(int );

public void Dispatch()
{
FirstDelegate del=new FirstDelegate (Foo);
del(5);
}
}



class Derived
{
public override string Foo(int x)
{
return " "+x;
}
}


class Runner
{

public static void Main()
{
Derived d=new Derived();
d.Dispatch(); //trys to delegate bases
}
}


The same thing happens when Base is NOT abstract class and Foo is
declared as virtual....

Is there a rule don't mix delegates and runtime polymorphism???

.

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