C# Article Spinner without Spintax

Essentially what I need is an article spinner that uses synonyms and automatically switches the words for various synonyms without spintax, in other words, it chooses which words to spin and finds the alternatives, then switches them in and out randomly by itself. An example of an online project of similar nature: [login to view URL] It must be written in c#. Basically in the end what I want is a method (or number of methods) that I can put into an existing project that accepts a string and returns the spun string.