private void DoListUpdate()
        {
            String[] commaSplit = this.listUpdateTextBox.Text.Split(',');

            ListEntry entry
                = (ListEntry)editUriTable[this.listEntryComboBox.Text];

            for (int i = 0; i < commaSplit.Length; i++)
            {
                String[] pair = commaSplit[i].Split('=');

                // Make the new replacement custom
                ListEntry.Custom custom = new ListEntry.Custom();
                custom.LocalName = pair[0];

                if (pair.Length == 2)
                {
                    custom.Value = pair[1];
                }
                else
                {
                    custom.Value = null;
                    entry.Elements.Remove(custom);
                    continue;
                }

                // Set the replacement custom
                int index = entry.Elements.IndexOf(custom);
                entry.Elements[index] = custom;
            }

            AtomEntry retEntry = service.Update(entry);
        }