Thread: Casting Enumerator?!?

I have implemented a Properties class that may contain name-value pairs. They are stored in a Hashtable. Now I want to implement this function:
Enumerator<string> PropertyNames();

How do I do that? When I do GetEnumerator on the Hashtable inside the Properties class, I get a Enumerator<Hashtable.Keys> back. How do I return Enumerator<string>?

Code:

namespace qwerty 
{

Class Properties
{
private   Hashtable mHashtable = new Hashtable();

public    Enumerator<string>  PropertyNames()
{


}


public AddProp(string Name, string Value)
{
   mHashtable.Add(Name, Value); 
   return;
}




}



}