winform textBox输入提示

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winform textBox输入提示，效果如图：

程序：

<span style="font-size:24px;">using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;namespace Suggest{    public partial class Form1 : DevExpress.XtraEditors.XtraForm    {        public Form1()        {            InitializeComponent();        }        private void Form1_Load(object sender, EventArgs e)        {            InputSuggest();        }               private void InputSuggest()        {            //文本框输入提示            AutoCompleteStringCollection strs = new AutoCompleteStringCollection();            strs.Add("Awert");            strs.Add("Afdgh");            strs.Add("Aad");            strs.Add("B456");            strs.Add("B7juj");            strs.Add("BES");            tb_username.AutoCompleteCustomSource = strs;            tb_username.AutoCompleteSource = AutoCompleteSource.CustomSource;            tb_username.AutoCompleteMode = AutoCompleteMode.Suggest;        }    }}</span>

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