请问如何在自定义控件中加属性？
自定义控件名称：
DropDownList_group.ascx
内容：

<%@   Control   Language= "C# "   AutoEventWireup= "true "   CodeFile= "DropDownList_group.ascx.cs "   Inherits= "ascx_DropDownList_group "   %>
<asp:DropDownList   ID= "DropDownList_group "   runat= "server "   Width= "150px ">
</asp:DropDownList>


CS文件内容

using   System;
using   System.Data;
using   System.Data.SqlClient;
using   System.Configuration;
using   System.Collections;
using   System.Web;
using   System.Web.Security;
using   System.Web.UI;
using   System.Web.UI.WebControls;
using   System.Web.UI.WebControls.WebParts;
using   System.Web.UI.HtmlControls;

public   partial   class   ascx_DropDownList_group   :   System.Web.UI.UserControl
{
        protected   void   Page_Load(object   sender,   EventArgs   e)
        {
                group_show();
        }
        public   void   group_show()
        {
                DBConn   myDB   =   new   DBConn();
                string   mySql   =   " ";
                mySql   =   "select   *   from   abis_group   where   1   =   1   order   by   group_power   asc ";
                this.DropDownList_group.DataSource   =   myDB.getDataReader(mySql);
                this.DropDownList_group.DataTextField   =   "group_name ";
                this.DropDownList_group.DataValueField   =   "group_power ";
                this.DropDownList_group.DataBind();
                myDB.Close();
        }
}


已经在其它页面中正确引用
请问俺在其它页面中，点击DropDownList_group.ascx中的下拉框时，如何得到下拉框中的值？


小弟新手，谢谢

------解决方案--------------------
public partial class ascx_DropDownList_group : System.Web.UI.UserControl
{
public string SelectedValue{
get{
EnsureChildControls();
this.DropDownList_group.SelectedValue;
}
}
.......

------解决方案--------------------
呵呵，上面少写了一个“return ”!
------解决方案--------------------
实际动手去把这个函数写上去，就可以了。
------解决方案--------------------
using System;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class ascx_DropDownList_group : System.Web.UI.UserControl
{
public string SelectedValue
{