string[] str = new string[4];
                str[0] = "shivu";
                str[1] = "Anil";
                str[2] = "shivu";
                str[3] = "Anil";

                str = RemoveDups(str, true);

The out put of array will be "shivu" and "Anil"


//Method for filtering the duplicates items..

        public string[] RemoveDups(string[] items, bool sort)
        {
            string[] uniqueItems = null;

            try
            {
                ArrayList noDups = new ArrayList();
                for (int i = 0; i < items.Length; i++)
                {
                    if (!noDups.Contains(items[i].Trim()))
                    {
                        noDups.Add(items[i].Trim());
                    }
                }
                if (sort) noDups.Sort();  //sorts list alphabetically
                uniqueItems = new String[noDups.Count];
                noDups.CopyTo(uniqueItems);
            }
            catch (Exception ex)
            {
                throw ex;
            }
            return uniqueItems;
        }