关于下拉选择框
我要自己订制下拉列表中的内容，从表中读取并做处理，请问.net下如何实现？
<td   style= "width:   135px ">
<asp:DropDownList   ID= "fulei "   runat= "server "> </asp:DropDownList>  
<%call   show_fulei%> &nbsp; </td>

' <%call   show_fulei%> 只能放在droplist外面，里面不让放

sub   show_fulei
Dim   connstr   As   String   =   ConfigurationSettings.AppSettings( "ConnectionString ")
Dim   queryString   As   String   =   "select   id,mingcheng   from   lanmu   where   fulei   =   0   order   by   paixu "
Using   connection   As   New   OdbcConnection(connstr)
Dim   command   As   New   OdbcCommand(queryString,   connection)
connection.Open()
Dim   reader   As   OdbcDataReader   =   command.ExecuteReader()
While   reader.Read()
'response.write(reader.getString(0)& "   |   "&reader.getString(1)   &   " <br> ")
response.Write( " <asp:ListItem   Value= " " "   &   reader.getString(0)   &   " " "> "   &   reader.getString(1)   &   " </asp:ListItem> ")
End   While
reader.Close()
End   Using
end   sub



------解决方案--------------------
fulei.DataSource = 此处为数据源
fulei.DataTextField = "你要显示的字段名称 ";
fulei.DataValueField = "×× ";fulei的value值
fulei.DataBind();
------解决方案--------------------
在一个DropDownList 里显示这些吗？还是用2个好些吧
------解决方案--------------------
试一下

用select * from [TableName]获取所有的数据填充到数据集中，如ds然后
void CreateDropList(ListItem itm)
{
DataView dv = new DataView()
dv.Table = ds.Tables[0];
dv.RowFilter = (itm == null) ? "id=0 " : string.Format( "fu={0} ",itm.Value);

foreach(DataRowView drv in dv)
{
ListItem item = new ListItem();
item.Text = drv[ "mingcheng "].ToString();
item.Value = drv[ "id "].ToString();
fulei.Items.Add(item);
CreateDropList(item);
}
}

第一次调用此方法使用CreateDropList(null);