Problem updating a dataset within a button click handler

[Southcoaster]

I am relatively new to Visual Basic 2005 Express Edition.
I am trying to create a simple program that:

1. Creates and populates a dataset in the form_load handler
2. Transfers control to a new form to input user changes to the data in a
Button2_Click event handler
3. returns control to the Button2_Click event handler to perform the dataset
update

However it can’t find the data adapter ‘custDA’ to perform the update in the
Button2_Click event handler.

Can anybody help please.

Many thanks.

Southcoaster.
Imports System.Data.Sql Client
Public Class MainCustomerSel ectionForm

Dim custDS As DataSet = New DataSet("Custom erSelection")
Dim CustomerRecordF orm As New CustomerRecordF orm

Private Sub Form1_Load(ByVa l sender As Object, ByVal e As
System.EventArg s) Handles Me.Load

Dim builder As New System.Data.Sql Client.SqlConne ctionStringBuil der
builder("Data Source") = ".\SQLEXPRE SS"
builder("Attach DBFilename") = "C:\SQL Server 2000 Sample
Databases\NORTH WND.MDF"
builder("Integr ated Security") = True
builder("Connec t Timeout") = 30
builder("User Instance") = True

Dim nwindConn As New SqlConnection()
nwindConn.Conne ctionString = builder.Connect ionString

Dim custDA As SqlDataAdapter = New SqlDataAdapter( "SELECT * FROM Customers",
nwindConn)
nwindConn.Open( )

custDA.Fill(cus tDS, "Customers" )
Me.DataGridView 1.DataSource = custDS
Me.DataGridView 1.DataMember = "Customers"

End Sub

Private Sub Button2_Click(B yVal sender As System.Object, ByVal e As
System.EventArg s) Handles Button2.Click

CustomerRecordF orm.ShowDialog( )

*** ERROR OCCURS HERE AS THE COMPILER CANNOT FIND ‘CustDA’ ***

custDA.Update(c ustDS, "Customers" )

End Sub

End Class