display collection data as string values using linq

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SQL

XAML

WPF

LINQ

C#5.0

This coding seems fine to me but for some reason when an item is selected in the combobox it gets listed in the listview without showing data inside of the item. and when I remove the listview.view in my xaml the item shows "(collection)".

public struct PIDData
        {
            public long PIdentity { get; set; }
            public string PName { get; set; }
            public string PPrice { get; set; }
            public string PSerial { get; set; }
            public string PDescription { get; set; }
            public string PType { get; set; }
            public string PPosition { get; set; }
            public Binary PImage { get; set; }
        }


       //Binding combobox
             using (DataClassesDataContext DC = new DataClassesDataContext())
           {
               cbItem.Items.Clear();
               foreach (tblProduct R in DC.tblProducts)
               cbItem.Items.Add(R);
               cbItem.DisplayMemberPath = "ProductName";
           }

        //Combobox Selection changed
           List<string> items = new List<string> { cbItem.SelectedItem.ToString() };

            IEnumerable<string> query = items.Where(item => item.ToString() != null);
            lvDataBinding.Items.Add(items);
            

            txt1.Text = items.ToString();
  
//Xaml
  <ListView Margin="338,20,1,16" Name="lvDataBinding">
            <ListView.View>
                <GridView>
                    <GridViewColumn DisplayMemberBinding="{Binding PName}">
                        <GridViewColumnHeader Tag="Product Name" Width="100">Product Name</GridViewColumnHeader>
                    </GridViewColumn>                   
                </GridView>
            </ListView.View>
        </ListView>
        <ComboBox x:Name="cbItem" HorizontalAlignment="Left" Margin="13,315,0,0" VerticalAlignment="Top" Width="321" SelectionChanged="cbItem_SelectionChanged"/>