I believe this method is available in .NET 3.5, but in earlier framework versions we have to implement this ourselves..
#region Helper functions
/// <summary>
/// Sorts the list box in descending order
/// </summary>
/// <param name="pList">the list to sort</param>
/// <param name="pByValue">Sort the list by values or text</param>
private void sortListBox(ref ListBox pList, bool pByValue)
{
SortedList lListItems = new SortedList();
//add listbox items to SortedList
foreach (ListItem lItem in pList.Items)
{
if (pByValue) lListItems.Add(lItem.Value, lItem);
else lListItems.Add(lItem.Text, lItem);
}
//clear list box
pList.Items.Clear();
//add sorted items to listbox
for (int i = 0; i < lListItems.Count; i++)
{
pList.Items.Add((ListItem)lListItems[lListItems.GetKey(i)]);
}
}
#endregion
}