vb cannot connect to mysql using odbc

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VB

i have a digitalpersona sdk sample in vb, i want to make its backend to mysql but my 1st problem is i cant connect or it gives an error in connecting to mysql, my odbc connection is ok, and when i use the code for connecting to other vb project its connected and ok, but when i use it in sample sdk of digitalpersona, it give an error in connecting,

here's my code:

 Imports System.Data.Odbc

Delegate Sub FunctionCall(ByVal param)

Public Class MainForm

Dim sql As String
Private con As New OdbcConnection("DSN=db")

Dim cmd As OdbcCommand = Nothing

Private Sub MainForm_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

Try
con.Open()

Catch ex As Exception
MsgBox("Error Creating DB Connection")

End Try
End Sub

thanks in advance in your help.