>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?

In C# / is a special character. I don't think it's a problem in VB.NET As Sergey said, run SQL Profiler and examine the actual command sent to SQL Server.