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why Finalize() in Object is override not virtual?

Posted By:      Posted Date: October 28, 2010    Points: 0   Category :.NET Framework

Finalize() is override, why it's not virtual? what's difference between virtual and override for method in base class? Thanks

public class Object
    public Object();
    public virtual bool Equals(object obj);
    public static bool Equals(object objA, object objB);
    protected override void Finalize();
    public virtual int GetHashCode();
    public extern Type GetType();
    protected extern object MemberwiseClone();
    public static bool ReferenceEquals(object objA, object objB);
    public virtual string ToString();

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