Hi I'm currently trying to write a function to copy a page between portals, updating the destination page if it already exists. To do this I need to update the content of modules in the destination page which I am trying to do with the following code:

if (source.BusinessControllerClass != "")
            {
                object controller = DotNetNuke.Framework.Reflection.CreateObject(source.BusinessControllerClass, source.BusinessControllerClass);
                if(controller is IPortable)
                {
                    IPortable p = (IPortable)controller;
                    string content = p.ExportModule(source.ModuleID);
                    if (content != "")
                    {
                        p.ImportModule(destination.ModuleID, content, source.Version, 0);
                    }
                }
            }

This sort of works, except that the source content is appended to the destination, instead of replacing it as I would have expected. Is there any way to make this function as I want it to? Since IPortable only implements import and export, I'm at a bit of a loss...
Thanks in advance,
Rupert

Thanks for your reply, I should have mentioned that the problem I am having is with the Text/Html module and the Links module, ie. core modules for which the IPortable implementation is already provided, so I don't have the option of changing the behaviour. At the moment my choices seem to be:
1. Inherit from HtmlText etc. to provide my own implementation (quite a lot of work and very non-standard).
2. Delete the modules that exist on the destination page and create new ones (probably less work to code, but incurs a performance overhead, and seems like a  very inelegant solution).
Could anyone suggest any better way?