，这是什么有关问题啊_ASP.NET

请教各位，这是什么问题啊？

C# code

namespace Mysite.Business{    /// <summary>    /// Category 的摘要说明    /// </summary>    public class Category    {        DBOperate dboperate = newasp:Button

C# code

 
 public partial class admin_manager_Edit : System.Web.UI.Page 
 { 
     Category category = new Category(); 
     protected void Page_Load(object sender, EventArgs e) 
     { 
         if (!IsPostBack) 
         { 
             ddl_category.DataSource = category.Bind_category(); 
             ddl_category.DataBind(); 
         } 
     } 
 }

------解决方案--------------------------------------------------------
啥问题？
------解决方案--------------------------------------------------------
在你的DDL中指定一下Text绑定到那个字段上
------解决方案--------------------------------------------------------
ddl_category.DataTextField = "xx"
ddl_category.DataValueField = "yy"

------解决方案--------------------------------------------------------

C# code

namespace Mysite.Business{    /// <summary>    /// Category 的摘要说明    /// </summary>    public class Category    {        DBOperate dboperate = new DBOperate();        public Category()        {            //            // TODO: 在此处添加构造函数逻辑            //        }        /// <summary>        /// 绑定下拉列表框        /// </summary>        /// <param name="ddl">DropDownList控件名称</param>        public DataTable Bind_category()        {            string strSql = "select xm_name from tb_tree where left(ltrim(keytxt),2)='2_'";            OleDbDataAdapter oda = new OleDbDataAdapter(strSql, dboperate.cn);            DataSet ds = new DataSet();            oda.Fill(ds);            //ddl.DataSource = ds.Tables[0];            return ds.Tables[0].DefaultView;        }    }}
------解决方案--------------------------------------------------------
public partial class admin_manager_Edit : System.Web.UI.Page
{
   Category category = new Category();
   protected void Page_Load(object sender, EventArgs e)
   {
       if (!IsPostBack)
       {
           ddl_category.DataSource = category.Bind_category();
           ddl_category.DataTextField = "text column";
           ddl_category.DataValueField = "value column";
           ddl_category.DataBind();
       }
   }
}
------解决方案--------------------------------------------------------
C# codepublic partial class admin_manager_Edit : System.Web.UI.Page{    Category category = new Category();    protected void Page_Load(object sender, EventArgs e)    {        if (!IsPostBack)        {            ddl_category.DataSource = category.Bind_category();            ddl_category.DataTextField = "text column";             ddl_category.DataValueField = "value column";             ddl_category.DataBind();        }    }}
------解决方案--------------------------------------------------------
探讨
ddl_category.DataTextField = "text column"; 
ddl_category.DataValueField = "value column"; 
这两个有什么区别啊