Clone a CheckBox

[Zürcher See]

I have a checkbox as sample, I have to create n-checkbox like that one in a
webform, so I have extended the CheckBox class and wrote a public clone
method that use the protected MemberwiseClone method.

If I look the MemberwiseClone method definiton I find the following phrase:

"
Return Value
A shallow copy of the current Object.

.....

A shallow copy creates a new instance of the same type as the original
object, and then copies the nonstatic fields of the original object. If the
field is a value type, a bit-by-bit copy of the field is performed. If the
field is a reference type, the reference is copied but the referred object
is not; ..
"

It's perfect! Precisely what I need. A bool attribute, like
CheckBox.Checked, is a value type, so I can set a different checked state
for each checkbox-clone ... but it didn't work. What's wrong?

class Class1

{

[STAThread]

static void Main(string[] args)

{

CheckBox cb=new CheckBox();

cb.Checked=false; // !!! That's realy funny, try to comment this line and
run the code again!!!

System.Web.UI.WebControls.CheckBox cb1=cb.Clone();

System.Web.UI.WebControls.CheckBox cb2=cb.Clone();

Console.WriteLine(cb.Checked);

Console.WriteLine(cb1.Checked);

Console.WriteLine(cb2.Checked);

cb1.Checked=!cb1.Checked;

Console.WriteLine();

Console.WriteLine(cb.Checked);

Console.WriteLine(cb1.Checked);

Console.WriteLine(cb2.Checked);

cb2.Checked=!cb.Checked;

Console.WriteLine();

Console.WriteLine(cb.Checked);

Console.WriteLine(cb1.Checked);

Console.WriteLine(cb2.Checked);

Console.ReadLine();

}

private class CheckBox:System.Web.UI.WebControls.CheckBox

{

public CheckBox Clone()

{

return (CheckBox)this.MemberwiseClone();

}

}

}