The code inside
Catch ex As Data.SqlClient.SqlException

is only going to run .. is something blows up.

........

I would go through this blog:
http://blogs.msdn.com/kcwalina/archive/2005/03/16/396787.aspx

and rework the code.

First, I would design it so you do not have to "blow up" with a duplicate
insert. I would, instead, use ExecuteNonQuery on a stored procedure and
return 0 if there is already a record. In this way, you can return an
"error" message without actually throwing an exception (which is expensive).

As for why you are not getting the success message, the answer is simple:
You are succeeding. Catch only works when you have an error. Since the data
entered the database without problem, there was no error, and there is no
message.

I would redesign for success (the rule) rather than failure (the exception).

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