[C#] Remove duplicates from listbox

This is a little snippet I wrote for a project im working on :)

Anyways here you go.

PHP Code:

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  public void RemoveListboxDuplicates(ListBox ListBox)
  {
    List<String> Removed = new List<String>();
    for (int I = 0; I < ListBox.Items.Count;I++)
    {
    if (!Removed.Contains(ListBox.Items[I].ToString()))
    {
    Removed.Add(ListBox.Items[I].ToString());
    }
    }
    ListBox.Items.Clear();
    foreach (String S in Removed)
    {
    ListBox.Items.Add(S);
    }

  } 


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