System.Web.UI.Page”并不包含“DataItem”的定义
aspx: 
  <%@   Page   Language= "C# "   AutoEventWireup= "true "   CodeFile= "edit_admin_datum.aspx.cs "   Inherits= "admin_admin_edit_admin_datum "   %>  
  <%@   Import   Namespace= "System.Data "%>      
  <!DOCTYPE   html   PUBLIC    "-//W3C//DTD   XHTML   1.0   Transitional//EN "    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd ">    
  <html   xmlns= "http://www.w3.org/1999/xhtml "   >  
  <head   runat= "server ">  
              <title> 管理员资料修改-YY3721 </title>  
                 <link   href= "../style/sys_edit_admin.css "   rel= "stylesheet "   type= "text/css "/>  
  </head>  
  <body   bgcolor= "#9CC7EF ">  
              <form   id= "form1 "   runat= "server "   action= "edit_admin_datum.aspx ">                                                   
                          <table   width= "70% "   border= "1 "   align= "center "   cellpadding= "0 "   cellspacing= "0 ">  
        <tr   align= "center ">     
              <td      height= "40 "   colspan= "2 ">     <span   class= "add_manage_title ">    修改管理员    <span   class= "edit_admin_title ">             
        <%#   DataBinder.Eval(Container.DataItem,    "Admin_name ")%>                  
              </span>    资料 </span>  </td>  
        </tr>  
        <tr   align= "center ">  
              <td      height= "30 "   style= "width:   441px "   align= "right "> 帐号: </td>  
              <td   width= "474 "      height= "30 "   colspan= "-1 "   align= "left ">  
                          <input   id= "Text1 "   type= "text "   value= "    <%#   DataBinder.Eval(Container.DataItem,    "Admin_name ")%>  "   />   </td>  
        </tr>  
        <tr   align= "center ">  
              <td      height= "30 "   style= "width:   441px "   align= "right ">  
                         密码: </td>  
              <td      height= "30 "   colspan= "-1 "   align= "left ">  
                          <input   id= "Text2 "   type= "text "   value= "    <%#   DataBinder.Eval(Container.DataItem,    "Admin_name ")%>  "   />   </td>  
        </tr>  
        <tr   align= "center ">  
  &