How to: Remove Duplicates from C# ListBox

i must admit i quite a lazy coder so if i can find a method online that i can bend to my will im stoked. every now and again i have to write my own unfortunately...

this is a simple snippet to remove duplicates from a ListBox in C# using an ArrayList. i run this method everytime i add new items.

use it, dont use it....

private void CheckDuplicates()

 {

            int r = ListBox.Items.Count;

            ArrayList newList = new ArrayList();

            //Load all Items into temp array

           string[] temp = new string[r];

            for (int i = 0; i < r; i++)

            {

                temp[i] = ListBox.Items[i].ToString();

            }

            //Add unique items to new ArrayList

            foreach (string ts in temp)

            {

                if (!newList.Contains(ts))

                {

                    newList.Add(ts);

                }

            }

            ListBox.Items.Clear();

            foreach (string ns in newList)

            {

                ListBox.Items.Add(ns.ToString());

            }

  }