new Button();
            btn_clearfilter = new Button();
            btn_clearfilter.Text = "清除结果";
            lb_msg = new Label();

            //if (ViewState[dropdownlistVK] == null && fieldList.Length != 0)
            //{
            //    string dropdown = ViewState[dropdownlistVK];
            //    for (int i = 0; i < fieldList.Length; i++)
            //    {
            //        ddl.Items.Add(new ListItem(fielddspList[i], fieldList[i]));
            //        if (i < fieldList.Length - 1)
            //            ViewState[dropdownlistVK] += ddl.Items[i].Value;
            //    }
            //}

            btn_setfilter.Click += new EventHandler(btn_Click);
            btn_clearfilter.Click += new EventHandler(btn_clearfilter_Click);
            ddl.SelectedIndexChanged += new EventHandler(ddl_SelectedIndexChanged);
            tb_input = new TextBox();

            //设置文本框响应回车事件
            tb_input.Attributes.Add("onkeypress","<script   language='javascript'>document.all."+tb_input.ClientID+".click;</script>");
            btn_setfilter.Text = "提交";
            Controls.Add(ddl);     
            Controls.Add(tb_input);
            Controls.Add(btn_setfilter);
            Controls.Add(btn_clearfilter);
            Controls.Add(lb_msg);
        }

        void btn_clearfilter_Click(object sender, EventArgs e)
        {
            isClearFilterClicked = true;
        }

        void btn_Click(object sender, EventArgs e)
        {
            isSetFilterClicked = true; 
        }


        void ddl_SelectedIndexChanged(object sender, EventArgs e)
        {
            filtercondition= ddl.SelectedItem.Text;
        }

        private void WriteLog(string log)
        {
            string path = @"/log.txt";
            if (!File.Exists(path))
            using (StreamWriter sw= File.CreateText(path))
            {
                sw.Write(String.Format("{0}:    {1}",DateTime.Now,log));
            }

            

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