获取组SPGroup的描述Description信息

通过SPGroup的Description属性是不能获取到组的描述信息的.

Reflect了一下系统的代码，发现系统是这样写的：

 protected void Page_Load(object sender, EventArgs e)
        {
            SPSecurity.RunWithElevatedPrivileges(delegate()
            {

                SPSite site = new SPSite("http://TEC/sites/sjs/default.aspx");MOSS               

                SPWeb web = site.RootWeb ;

                SPGroup g = web.SiteGroups["MyGorup"];

                SPFieldMultiLineText text = (SPFieldMultiLineText)web.SiteUserInfoList.Fields[SPBuiltInFieldId.Notes];

                SPListItem groupItem = web.SiteUserInfoList.GetItemById(g.ID);
                object objDes = groupItem[text.InternalName];

                Response.Write(g.Name + "<br/>");
                Response.Write( text.GetFieldValueAsHtml(objDes) );              
              
            });

        }