error running sp_stored_procedures

I downloaded the code example "Running Stored Procedures with ASP.NET" (http://www.dotnetjunkies.com/Tutorial/9AE62C44-3841-4687-B906-2F6D4A5A4622.dcik)
and I'm having trouble filtering the sp's that are populating the drop down box. Here's my code: (all I did was add the one parameter)

Dim ds As New DataSet

Dim conn As New SqlConnection( _
Data source=" & DatabaseServer.Text & _
";User id=" & Userid.text & _
";Password=" & Password.Text & _
";Initial catalog=" & Database.Text)

Dim cmd As New SqlCommand("sp_stored_procedures", conn)
Dim adpt As New SqlDataAdapter(cmd)
Try
cmd.Parameters.Add("@.sp_name", SqlDbType.NVarchar, 390).Value = CType("my%", String)

so if I comment out the cmd.Parameters.Add ... line it all works fine and I get every sp, but if I uncomment it I get " Incorrect syntax near 'sp_stored_procedures'" every time no matter what i put in the string.

I have a feeling I'm doing something stupid :) Anyone have any ideas? The query works fine in query analyzer with the same arguments that I'm trying in the code.Add:

cmd.CommandType=CommandType.StoredProcedure|||...and you shouldn't begin the name of your stored procedures with the sp_ prefix. This prefix should always be reserved only for system stored procedures.|||"
...and you shouldn't begin the name of your stored procedures with the sp_ prefix. This prefix should always be reserved only for system stored procedures.

"

It IS a system stored procedure.|||"
Add:

cmd.CommandType=CommandType.StoredProcedure
"

Doh!

Thanks!