Nini Library API Reference - http://nini.sourceforge.net/

OrderedList.Insert Method 

Inserts an object into the collection based on an index.

public void Insert(
   int index,
   object key,
   object value
);

Parameters

index
Index in which to insert.
key
Key of the object.
value
Value of the object.

See Also

OrderedList Class | Nini.Util Namespace