Alphabetize drop down list and remove duplicate items.

protected void AlphabetizeDropDownListAndRemoveDuplicates(DropDownList ThisDropDownList)
{
 SortedList AlphabetizedItems = new SortedList();
 foreach (ListItem ThisListItem in ThisDropDownList.Items) {
  if (AlphabetizedItems.Contains(System.Globalization.CultureInfo.CurrentCulture.TextInfo.ToTitleCase(Strings.Trim(ThisListItem.Text))) == false) {
   AlphabetizedItems.Add(System.Globalization.CultureInfo.CurrentCulture.TextInfo.ToTitleCase(Strings.Trim(ThisListItem.Text)), ThisListItem.Value);
  }
 }
 ThisDropDownList.Items.Clear();
 foreach (DictionaryEntry AlphabetizedItem in AlphabetizedItems) {
  ThisDropDownList.Items.Add(new ListItem(AlphabetizedItem.Key, AlphabetizedItem.Value));
 }
}