Microsoft.Phone.Controls.ListPicker.UpdateSummary C# (CSharp) Method

        private void UpdateSummary(IList newValue)
        {
            const string space = " ";
            string summary = null;

            if (null != SummaryForSelectedItemsDelegate)
            {
                // Ask the delegate to sumarize the selected items.
                summary = SummaryForSelectedItemsDelegate(newValue);
            }

            if (summary == null)
            {
                // No summary was provided, so by default, show only the first item in the selection list.
                if (null == newValue || newValue.Count == 0)
                {
                    // In the case that there were no selected items, show the empty string.
                    summary = space;
                }
                else
                {
                    summary = newValue[0].ToString();
                }
            }

            // The display does not size correctly if the empty string is used.
            if (String.IsNullOrEmpty(summary))
            {
                summary = space;
            }

            if (summary == space && SelectedItem != null)
            {
                summary = SelectedItem.ToString();
            }

            if (null != _multipleSelectionModeSummary)
            {
                _multipleSelectionModeSummary.Text = summary;
                if (_multipleSelectionModeSummary.Visibility == System.Windows.Visibility.Collapsed)
                {
                    _multipleSelectionModeSummary.Visibility = System.Windows.Visibility.Visible;
                }
            }
        }