textbox 输入值提示。。。（类似百度搜索）

public void textBox5_xiala()

        {

           DataSet ds = SQl_yuji.ds_cinvname();

           this.textBox5.AutoCompleteMode = AutoCompleteMode.SuggestAppend;

           this.textBox5.AutoCompleteSource = AutoCompleteSource.CustomSource;

           //  DataTable table = new DataTable();

           //   table = ds.Tables[0];

           ArrayList al = new ArrayList();

           for (int i = ; i < ds.Tables[].Rows.Count; i++)

            {

               if (!al.Contains(ds.Tables[].Rows[i]["cInvName"].ToString()))

                {

                    al.Add(ds.Tables[].Rows[i]["cInvName"].ToString());

                }

            }

           AutoCompleteStringCollection ac = new AutoCompleteStringCollection();

           string[] s = (string[])al.ToArray(typeof(string));

           for (int i = ; i < s.GetLength(); i++)

            {

                ac.Add(s[i]);

            }

           this.textBox5.AutoCompleteCustomSource = ac;//设置该文本框的自动完成数据源

        }

效果图