Acess dataset between 2 Windows Form

[fung1223]

Dear all
If I have 2 form, 1 call form1 and the other call form2.
I create a connection in form1:


CLASS FORM1
PUBLIC DS As DATASET

Dim connstr As String = "DSN=TEST"
Dim cn As New OdbcConnection(connstr)
Dim DA1 As New OdbcDataAdapter("SELECT * FROM A ", cn)

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

cn.Open()
odbcadapter1.Fill(DS, "A")

I can successfully access DS in form1, but when I try to access DS in form2, it said" object reference not set to instance of object". It seem that it treat it as a new variable. I try this in form2:

Dim zds As DataSet

zds = form1.ds
messagebox.show(zds.tables("A").Rows.count)

But still not work. Anyone can told me how to access it from anothe table? Thank you very much.