Pass variable to new form with Datatable and Listbox - vb.net

Question

I am currently trying to write an application like address book. Listbox works properly, it shows everything corretly. But I need to pass id of chosen listbox item to another form. I got code like this in Form2:
Private myTable As New DataTable()
Public Sub LoadXml(sender As Object, e As EventArgs) Handles Me.Load
With myTable.Columns
.Add("DisplayValue", GetType(String))
.Add("HiddenValue", GetType(Integer))
End With
myTable.DefaultView.Sort = "DisplayValue ASC"
ListBox1.DisplayMember = "DisplayValue"
ListBox1.ValueMember = "HiddenValue"
ListBox1.DataSource = myTable
Dim doc As New Xml.XmlDocument
doc.Load("c:\address.xml")
Dim xmlName As Xml.XmlNodeList = doc.GetElementsByTagName("name")
Dim xmlSurname As Xml.XmlNodeList = doc.GetElementsByTagName("surname")
Dim xmlId As Xml.XmlNodeList = doc.GetElementsByTagName("id")
For i As Integer = 0 To xmlName.Count - 1
Dim nazwa As String = xmlName(i).FirstChild.Value + " " + xmlSurname(i).FirstChild.Value
myTable.Rows.Add(nazwa, xmlId(i).FirstChild.Value)
MsgBox(myTable.Rows(i).Item(1).ToString)
Next i
ListBox1.Sorted = True
End Sub
Later in the code I have event:
Public Sub ListBox1_DoubleClick(sender As Object, e As EventArgs) Handles ListBox1.DoubleClick
End Sub
I would like to know how can I call id from DataTable for selected listbox item. I hope u understand what I mean since my english is not perfect :)

Answer 1

Since you have added the XML value id to the data table column HiddenValue and you have assigned HiddenValue as the ValueMember for the listbox, once a record is selected in the listbox, id will be available in the listbox's [SelectedValue][1] member. For example:
Public Sub ListBox1_DoubleClick(sender As Object, e As EventArgs) Handles ListBox1.DoubleClick
MsgBox("Selected Id: " & ListBox1.SelectedValue.ToString())
End Sub