[c#] Value does not fall within the expected range

I am using the following code to update a listbox, this recieving a list from a Web service:

client.userKeywordsCompleted += new EventHandler<userKeywordsCompletedEventArgs>(client_userKeywordsCompleted);
client.userKeywordsAsync();

Using:

void client_userKeywordsCompleted(object sender, userKeywordsCompletedEventArgs e)
{

    string result = System.Convert.ToString(e.Result);

    for (int i = 0; i < e.Result.Count; i++)
    {

        ListBoxItem lbitem = new ListBoxItem();

        lbitem.Name = "lb_" + i;
        lbitem.Content = e.Result[i];

        lbitem.AddHandler(UIElement.MouseLeftButtonDownEvent, new MouseButtonEventHandler(ListBoxItem_DoubleClickEvent), true);

        listBox1.Items.Add(lbitem);

    }

This works fine, as I use it when the Child window loads, so the ListBox gets the list from the database, however, when a user selects one of the items in the ListBox, they have the option to edit the selected item. So once the edit is in place, there is an edit button, which updates the column in the table in the database. So then on the button click, I am again calling the aforementioned code to update the ListBox with the new credentials. However, this brings back the error -

"Value does not fall within the expected range."

Why can I not call the Web method on the button click, as all it is doing is refreshing the ListBox???

I had from a totaly different reason the same notice "Value does not fall within the expected range" from the Visual studio 2008 while trying to use the: Tools -> Windows Embedded Silverlight Tools -> Update Silverlight For Windows Embedded Project.

After spending many ohurs I found out that the problem was that there wasn't a resource file and the update tool looks for the .RC file

Therefor the solution is to add to the resource folder a .RC file and than it works perfectly. I hope it will help someone out there

In case of WSS 3.0 recently I experienced same issue. It was because of column that was accessed from code was not present in the wss list.