winform让Textbox像百度一下实现下拉显示

List<string> Data = new List<string>();



        string Randomstr = "功夫撒黑胡椒hcbvf蜂窝qwertyuiopasdfghjklzxcvbnm法国的恢复到飞范德萨QWERTYUIOPASDFGHJKLZXCVBNM出现过热423贴①46546也有一头热刚恢复到贴3天赋如头3广泛的我让他";





        Random rd = new Random(GetRandomSeed());



        static int GetRandomSeed()

        {

            byte[] bytes = new byte[4];

            System.Security.Cryptography.RNGCryptoServiceProvider rng = new System.Security.Cryptography.RNGCryptoServiceProvider();

            rng.GetBytes(bytes);

            return BitConverter.ToInt32(bytes, 0);

        }

        public Form1()

        {

            InitializeComponent();





            for (int i = 0; i < 20000000; i++)

            {

                Data.Add(Randomstr.ToCharArray()[rd.Next(Randomstr.Length)].ToString()

                    + Randomstr.ToCharArray()[rd.Next(Randomstr.Length)].ToString()

                    + Randomstr.ToCharArray()[rd.Next(Randomstr.Length)].ToString()

                    + Randomstr.ToCharArray()[rd.Next(Randomstr.Length)].ToString()

                    + Randomstr.ToCharArray()[rd.Next(Randomstr.Length)].ToString());

            }



            this.textBox1.AutoCompleteCustomSource.Clear();

            this.textBox1.AutoCompleteCustomSource.AddRange(Data.ToArray());

            this.textBox1.AutoCompleteMode = System.Windows.Forms.AutoCompleteMode.SuggestAppend;

            this.textBox1.AutoCompleteSource = System.Windows.Forms.AutoCompleteSource.CustomSource;



        }