Avevo sbagliato la seconda parte del paramtro in sqldataadapter ma ora si ferma ancora in quel punto.

code
Dim sConn As String = "Driver=MySQL ODBC 3.51 Driver; Database=db;dsn=dsn;uid=;password=;"
Dim SQL As String
Dim objConn As New OdbcConnection(sConn)
Try
' apro la connessione
objConn.Open()
Catch err As Microsoft.Data.Odbc.OdbcException
MessageBox.Show(err.Message)
End Try

SQL = "SELECT * FROM clienti_fornitori"
Dim cmd As New SqlDataAdapter(SQL, sConn)

L'errore che mi dà è:
An unhandled exception of type 'System.ArgumentException' occurred in system.data.dll

Additional information: Unknown connection option in connection string: driver.