Items collection must be empty before using ItemsSource !!!

[Mohammad Dayyan]

Hi, I have written the below code for display some data in a ListView, but whenever I run it I receive this Exception Items collection must be empty before using ItemsSource

public class RandomTreeViewItems
{
public string name { get; set; }
public string tag { get; set; }
public string location { get; set; }
}

public partial class MainWindow : Window
{
public ObservableCollection<RandomTreeViewItems> randomTreeViewItems = new ObservableCollection<RandomTreeViewItems>();

public MainWindow()
{
	this.InitializeComponent();

    this.DataContext = randomTreeViewItems;
    addItems();
}

private void addItems()
{
    for (int i = 0; i < 100; i++)
    {
        randomTreeViewItems.Add(newItem());
    }
}

RandomTreeViewItems newItem()
{
    return new RandomTreeViewItems { name = DateTime.Now.Ticks.ToString(), location = DateTime.Now.Ticks.ToString(), tag = DateTime.Now.Ticks.ToString() };
}

}

<Grid x:Name="LayoutRoot">
<ListView ItemsSource="{Binding}">
<ListView.View>
<GridView>
<GridViewColumn Header="Name" Width="200">
<GridViewColumn.CellTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<Image Width="16" Height="16" />
<Label Content="{Binding Path=name}" />
</StackPanel>
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
<GridViewColumn Header="Tags" Width="200" DisplayMemberBinding="{Binding Path=tag}" />
<GridViewColumn Header="Location" Width="400" DisplayMemberBinding="{Binding Path=location}" />
</GridView>
</ListView.View>
<Separator />
</ListView>
</Grid>

Could you please guide me, what's wrong with it? thanks

[Insincere Dave]

The separator you are adding in the xaml is being treated as an item, remove it or place it in the grid instead.

[Mohammad Dayyan]

Great, It works ;) Thanks