// Some class that you can use
public class Foo
{
    public virtual string DoFoo() { return "Foo.DoFoo"; }
    public virtual string DoBar() { return "Foo.DoBar"; }
}
 
public class DerivedFromFoo
{
    public override string DoFoo() { return "DerivedFromFoo.DoFoo"; }
    public new      string DoBar() { return "DerivedFromFoo.DoBar"; } 
}
 
public class Main
{
    public static void Main(string[] args)
    {
        DerivedFromFoo derivedFromFoo = new DerivedFromFoo();
        Console.WriteLine(derivedFromFoo.DoFoo());
        Console.WriteLine(derivedFromFoo.DoBar());
 
        Foo foo = (Foo)derivedFromFoo;
        Console.WriteLine(foo.DoFoo());
        Console.WriteLine(foo.DoBar());
        
        Console.ReadLine();
    }
}

DerivedFromFoo.DoFoo
DerivedFromFoo.DoBar
DerivedFromFoo.DoFoo
Foo.DoBar

void MethodName();

I don't know and you don't either.
Militant Agnostic