模擬下拉列表框  BODY { FONT: 12px 宋體 } TD { FONT: 12px 宋體 } DIV { FONT: 12px 宋體 } LABEL { PADDING-RIGHT: 0px; PADDING-LEFT: 4px; PADDING-BOTTOM: 0px; PADDING-TOP: 3px; HEIGHT: 19px } .link_box { CURSOR: default; TEXT-ALIGN: left } .link_head { BORDER-RIGHT: 2px inset; BORDER-TOP: 2px inset; BORDER-LEFT: 2px inset; WIDTH: 100%;  BORDER-BOTTOM: 2px inset; HEIGHT: 23px } .link_text { PADDING-LEFT: 2px; BACKGROUND: #fff } .link_arrow0 { BORDER-RIGHT: 2px outset; BORDER-TOP: 2px outset; BACKGROUND: buttonface;  FONT: 14px marlett; BORDER-LEFT: 2px outset; WIDTH: 22px;  BORDER-BOTTOM: 2px outset; HEIGHT: 100%; TEXT-ALIGN: center } .link_arrow1 { BORDER-RIGHT: buttonshadow 1px solid; PADDING-RIGHT: 0px;  BORDER-TOP: buttonshadow 1px solid; PADDING-LEFT: 2px;  BACKGROUND: buttonface; PADDING-BOTTOM: 0px; FONT: 14px marlett;  BORDER-LEFT: buttonshadow 1px solid; WIDTH: 22px; PADDING-TOP: 2px;  BORDER-BOTTOM: buttonshadow 1px solid; HEIGHT: 100%; TEXT-ALIGN: center } .link_value { BORDER-RIGHT: 1px solid; BORDER-TOP: 1px solid; FILTER: alpha(opacity:0);  VISIBILITY: hidden; OVERFLOW-X: hidden; OVERFLOW: auto; BORDER-LEFT: 1px solid;  BORDER-BOTTOM: 1px solid; POSITION: absolute } .link_record0 { BORDER-TOP: #eee 1px solid; PADDING-LEFT: 2px; BACKGROUND: #fff;  WIDTH: 100%; COLOR: #000; HEIGHT: 20px } .link_record1 { BORDER-TOP: #047 1px solid; PADDING-LEFT: 2px; BACKGROUND: #058;  WIDTH: 100%; COLOR: #fe0; HEIGHT: 20px }    模擬下拉框        請選擇？ 6         {0}">     北京市 上海市 河南省 深圳市 大連市 云南省            using System; using System.Collections; using System.ComponentModel; using System.Data; using System.Drawing; using System.Web; using System.Web.SessionState; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.HtmlControls; using System.Data.OleDb;  namespace eMeng { ///  /// ShowList 的摘要說明。 ///  public class WebDropDownList : System.Web.UI.Page { protected System.Web.UI.WebControls.DataGrid DataGrid1;  private void Page_Load(object sender, System.EventArgs e) { DataGrid1.Columns[0].ItemStyle.Width = Unit.Pixel(400); DataGrid1.Columns[1].ItemStyle.Width = Unit.Pixel(100); Data_Bind(); }  public void Data_Bind() { Response.CacheControl = "no-cache"; Response.Expires = -1; try { string strSQL = "SELECT id,objectGuid,Title,CreateDate,HitCount FROM Document ORDER BY id DESC"; string cnString = (new Connection()).ConnectionString; OleDbConnection cn = new OleDbConnection(cnString); cn.Open(); OleDbCommand cmd = new OleDbCommand(strSQL, cn); DataGrid1.DataSource = cmd.ExecuteReader(CommandBehavior.CloseConnection); DataGrid1.DataBind(); cn.Close(); cn.Dispose(); cn = null; cmd.Dispose(); cmd = null; } catch(OleDbException myOleDbException) { Response.Write("錯(cuò)誤：" + myOleDbException.Message + ":" + myOleDbException.HelpLink); Response.End(); } } private void DataGrid1_ItemDataBound(object sender,System.Web.UI.WebControls.DataGridItemEventArgs e) {  if( e.Item.ItemIndex != -1 ) { e.Item.A