自动下拉功能

try
            {

                string strConn = "SERVER=(local);DATABASE=HzInforBase;UID=sa;PWD=123456";
               string sql = "select a.eatname,a.pym,b.hotelname,b.pym from eat as a,live as b";
                SqlConnection myCn = new SqlConnection(strConn);
                myCn.Open();
                SqlCommand myCmd = new SqlCommand(sql, myCn);
                SqlDataReader P_Dr = myCmd.ExecuteReader();

                AutoCompleteStringCollection auto = new AutoCompleteStringCollection();
                if (HzInforSys.Properties.Settings.Default.CanHistoryKey != null)
                    auto = HzInforSys.Properties.Settings.Default.CanHistoryKey;
                StringBuilder stri = new StringBuilder();

                while (P_Dr.Read())
                {
                    auto.Add(P_Dr[0].ToString());
                    auto.Add(P_Dr[1].ToString());
                    auto.Add(P_Dr[2].ToString());
                    auto.Add(P_Dr[3].ToString());

                }

                HzInforSys.Properties.Settings.Default.CanHistoryKey = auto;
                this.txtgjs.AutoCompleteMode = AutoCompleteMode.Suggest;
                this.txtgjs.AutoCompleteSource = AutoCompleteSource.CustomSource;
                this.txtgjs.AutoCompleteCustomSource = auto;

            }
            catch (AccessViolationException aa)
            {
                MessageBox.Show(aa.Source.ToString());
            }

目前能实现这样的功能：
输入拼音码或者中文名，会自动下拉名称。
我想要实现这样一种功能：
如果输入拼音码，下拉显示的是对应的中文名。
大家帮忙看看 --------------------编程问答-------------------- 改一下这个属性:this.txtgjs.AutoCompleteSource = AutoCompleteSource.CustomSource;
看看是通过文件或是别的将两者对应起来,研究下那几个枚举值的含义吧.          --------------------编程问答-------------------- 大家帮忙看看 --------------------编程问答-------------------- 那你需要先把拼音转化为汉字，然后在下拉吧
http://www.fixdown.com/wz/article/14/15/2006/47778.htm
汉字转化拼音挺多的啊 --------------------编程问答-------------------- 貌似有点困难

补充：.NET技术 ,  C#