Raddropdownlist filter with different items and the same display value

            DataTable dt = new DataTable();
            dt.Columns.Add("Title", typeof(string));
            dt.Columns.Add("Id", typeof(int));

            dt.Rows.Add("Kiwi", 1);
            dt.Rows.Add("Apple", 2); 
            dt.Rows.Add("Apple", 3); 
            dt.Rows.Add("Apricot", 4);

            this.radDropDownList1.DisplayMember = "Title";
            this.radDropDownList1.ValueMember = "Id";
            this.radDropDownList1.DataSource = dt;
            this.radDropDownList1.AutoCompleteMode = AutoCompleteMode.Suggest;
            this.radDropDownList1.DropDownListElement.AutoCompleteSuggest.SuggestMode = SuggestMode.Contains;