Connection string in execution time

We have developed our first Add-On for SBO. Our surprise is that the connexion string doesn?t works when Add-On is registered in SBO. The connection string works in Visual Basic environment but it doesn?t works in execution time.

We are using SBO and SDK 6.50. The connection string we are using is: 0030002C0030002C00530041005000420044005F00440061007400650076002C0050004C006F006D0056004900490056

Please, can anybody help me?

Thank you for your help and your time.

Albert Masnou