//	content of file data.txt:
		/*
				Name|Ort|
				Huber|Berlin|
				Huber|Rostock|
				Huber|Berlin|
				Huber|Bielefeld|
				Maier|Jena|
				Schröder|Gera|
		*/		
 
		public static void Main(string[] args) {
			string fileName = "/tmp/data.txt";
			foreach (string name in GetNames(fileName)) {
				Console.WriteLine ("INFO: name: " + name);
			}
		}
 
		private static string[] GetNames(string fileName) {
			System.IO.StreamReader sr = new System.IO.StreamReader(fileName);
			string currentLine = null;
			ArrayList names = new ArrayList();
			string[] fields = null;
			char[] seperator = new char[] {'|'};
			bool isColumnLine = true;
 
			while ((currentLine = sr.ReadLine()) != null) {
					fields = currentLine.Split(seperator);
					if ( ! isColumnLine && fields != null && fields.Length > 0 && ! _
  names.Contains(fields[0])) {
						names.Add (fields[0]);
					}
					isColumnLine = false;
			}
			return (string[])names.ToArray (System.Type.GetType("System.String"));
		}