Linq to get difference of two listviews and put it in third in Windows Form C#

I have two list views which have same data but differing in the number of records. I want to get the non-matching listviewitems in third list view. I have using the following code but it is not helping. The variables x and y are making problem.

var list1Source = lvFace.Items.Cast<ListViewItem>();
var list2Source = lvDBdata.Items.Cast<ListViewItem>();

lvDataToUpload = list1Source.Where(
    (x => list2Source.All(y => y.Text != x.Text));
Jon Skeet
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quotationmark

LINQ doesn't have a "set difference" operator itself... but you can use Except twice:

var list1Text = list1Source.Select(x => x.Text);
var list2Text = list2Source.Select(x => x.Text);
var difference = list1Text.Except(list2Text)
                          .Concat(list2Text.Except(list1Text))
                          .ToList();

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