下面是模仿的DropDownList的效果，支持图片，多列，换行等。查看例子

WebDropDownList.ASPx

<%@ Page language="c#" Codebehind="WebDropDownList.ASPx.cs"validateRequest="false"

AutoEventWireup="false" Inherits="eMeng.WebDropDownList" %>

WebDropDownList.ASPx.cs

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

{

///

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("错误：" + 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.Attributes.Add("onmouseover", "this.bgColor='#C1D2EE'");

e.Item.Attributes.Add("onclick",

"document.all.text1.innerText=this.cells[0].innerText;document.all.form1.city.value=this.cells[0].innerText;");

if (e.Item.ItemIndex % 2 == 0 )

{

e.Item.Attributes.Add("bgcolor", "#FFFFFF");

e.Item.Attributes.Add("onmouseout", "this.bgColor=document.getElementById('DataGrid1').getAttribute('singleValue')");

}

else

{

e.Item.Attributes.Add("bgcolor", "oldlace");

e.Item.Attributes.Add("onmouseout", "this.bgColor=document.getElementById('DataGrid1').getAttribute('oldValue')");

}

}

else

{

DataGrid1.Attributes.Add("oldValue", "oldlace");

DataGrid1.Attributes.Add("singleValue", "#FFFFFF");

}

}

#region Web Form Designer generated code

override protected void OnInit(EventArgs e)

{

//

// CODEGEN：该调用是 ASP.NET Web 窗体设计器所必需的。

//

InitializeComponent();

base.OnInit(e);

}

///

private void InitializeComponent()

{

this.DataGrid1.ItemDataBound += new System.Web.UI.WebControls.DataGridItemEventHandler(this.DataGrid1_ItemDataBound);

this.Load += new System.EventHandler(this.Page_Load);

}

#endregion

}

}