只要在textBox1中輸入字符，就會檢索；如入0,將檢索出0開頭的字符

當然，事先要先添加字符List

AutoCompleteStringCollection ss = new AutoCompleteStringCollection();
            ss.Add("01");
            ss.Add("02");
            ss.Add("03");
            ss.Add("04");
            ss.Add("11");
            ss.Add("18");
            this.textBox1.AutoCompleteCustomSource = ss;
            this.textBox1.AutoCompleteSource = AutoCompleteSource.CustomSource;
            this.textBox1.AutoCompleteMode = AutoCompleteMode.Suggest;