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In the article on CodeProject.com, the author points out several likely sources of error that could be your problem: 1.) long filenames (install OpenOffice Portable in a short path, best if directly off the root); 2.) OpenOffice should be in the installation folder of your application (so run it from the same short path where you install OpenOffice Portable); 3.) certain characters in path are rejected by OpenOffice Portable (so use only very common characters in it); 4.) for the example C# calling code to find your Basic macro that you create in OpenOffice Portable, to find OpenOffice Portable executable, etc. you need to correctly point your code to them (the author did it in an application configuration file with an appsettings section that he showed in the article, and you might have to modify that to fit your installation).

The .NET code I've seen that instantiates OpenOffice.org to do things requires a LOCAL install of OpenOffice.org that is registered on the PC. OpenOffice.org Portable is not registered and, thus, does not have the appropriate objects available for .NET. Your best bet is to install OpenOffice.org and then instantiate it using the code available. If you're on a shared host where you can't install it, you may be out of luck.