How to prevent base class form being serialized

I have a class that is a control derived from UserControl. I want to use
serialization and deserialization with this calss but I get an exception
"Cannot serialize member System.ComponentModel.Component.Site of type
System.ComponentModel.ISite because it is an interface.".

I am not interested in serializing any member from the base class only the
properties in the derived class.

How can I prevent the entire base class from being serialized?


Code snippet

public partial class UserControl1 : UserControl
{
private int item1;
private string item2;


public UserControl1()
{

}

public int Item1
{
get {return item1;}
set {item1 = value;}
}

public string Item2
{
get { return item2; }
set { item2 = value; }
}
}


public partial class Form1 : Form
{
private UserControl1 Uctrl1;
.
.
.
Uctrl1 = new UserControl1();
Uctrl1.Item1 = 3;
Uctrl1.Item2 = "This is a test";

.
.
.
XmlSerializer mySerializer = new XmlSerializer(typeof(UserControl1));
// To write to a file, create a StreamWriter object.
StreamWriter myWriter = new StreamWriter("myFileName.xml");
mySerializer.Serialize(myWriter, Uctrl1);
myWriter.Close();
}