Can anyone tell me how to add an XMLNamespace prefix to a C# class 
declaration?  I have a couple of different namespaces that must be declared 
in my XML file but I can't figure out what class/property attributes I need 
to add to have a namespace prefix generated in front of the element when the 
class is serialized.

I am looking for "rex" so the serialization will occur like the following.
<rex:ElementName>
  <rex:Value1> A</rex:Value1>
  <rex:Value2> B</rex:Value2>
</rex:ElementName>

So far all I am able to come up with is
<ElementName xmlns="rex">
  <Value1 xmlns="rex"> A</Value1>
  <Value2 xmlns="rex"> B</Value2>
</rex:ElementName >

I get this when I have the following
[XmlElementAttribute(ElementName="Foo", IsNullable=true, 
Form=XmlSchemaForm.Qualified)]
public class Foo
{
    [XmlElement("ElementName")]
    public ElementName ElementName
    {
        get {return menElementName;}
        set {menElementName = value;}
    }
}

public class ElementName
{
    [XmlElement("Value1")]
    public string Value1
    {
        get;
        set;
     }
    [XmlElement("Value2")]
    public string Value2
    {
        get;
        set;
     }
}