>I have found that the SQLClient has a problem when we use the / character when doing a full text search. However, the same command in the SSMS interface does not generate any error. So, if I have a value such as N/D which need to be used in a full text search, how can I adjust the syntax so to use that character?

What SQLClient are you referring to? What error do you get? Did you check in SQL Server Profiler what has been actually sent o SQL Server?