If you just want to know if there are duplicate items in the listview you can use this function
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim ListView As New ListView
Dim ListViewItem As ListViewItem
For i = 1 To 3
ListViewItem = ListView.Items.Add("Item")
If ListViewContainsDuplicates(ListView, 0) Then
MsgBox("SubItem 0 has duplicate values")
If ListViewContainsDuplicates(ListView, 1) Then
'will not be called.
MsgBox("SubItem 1 has duplicate values")
Private Function ListViewContainsDuplicates(ByVal listView As ListView, ByVal subItemIndex As Integer) As Boolean
'Get a distinct count of the subitem
Dim DistinctCount As Integer = (From Item In listView.Items _
Select CType(Item, ListViewItem).SubItems(subItemIndex).Text _
'If the distinct count is not equal to the total listview count
'then there are duplicate values.
Return DistinctCount <> listView.Items.Count
Hi. I have a form with list box : lst_product, datagridview : grd_order and button: btn_addline. lst_product has a list of product ids selected from database (MS Acess 2013) , grd_order is by default empty except for 2 headers and btn_addline adds rows to grd_order.
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