搞定一个在DataGrid中DropDownList模板列值初始化的问题

        我想有了下面两段就可以解决题目中的问题了，当然这个还没有涉及到模板列DropDownList数据绑定，但是我相信通过这个例子，再举一反三应该都可以解决的。这个方法应该算是比较简单的了吧，希望可以对不明白的朋友有所帮助。 :)
DataGrid模板列如下： <%# DataBinder.Eval(Container,"DataItem.Credit")%>

< asp:TemplateColumn >
                         < HeaderTemplate >
                            信誉
                         </ HeaderTemplate >
                         < ItemTemplate >
                             <% # DataBinder.Eval(Container, " DataItem.Credit " ) %>
                         </ ItemTemplate >
                         < EditItemTemplate >
                             < asp:DropDownList id = " creditDlist "  runat = " server "  Width = " 50 "  SelectedIndex = ' <%# DataBinder.Eval(Container, "DataItem.IndexCredit") %> ' >
                                 < asp:ListItem Value = " 良好 " > 良好 </ asp:ListItem >
                                 < asp:ListItem Value = " 较好 " > 较好 </ asp:ListItem >
                                 < asp:ListItem Value = " 一般 " > 一般 </ asp:ListItem >
                                 < asp:ListItem Value = " 较差 " > 较差 </ asp:ListItem >
                             </ asp:DropDownList >
                         </ EditItemTemplate >
                     </ asp:TemplateColumn >

SQL 语句如下：
select ID,Supp_Custom_NO,Name,rtrim(Phone) as Phone,rtrim(Fax) as Fax,Telation,Address,Zip,
      case
        when Credit='A' then '良好'
        when Credit='B' then '较好'
        when Credit='C' then '一般'
        when Credit='D' then '较差'
   end  as Credit,
     case
        when Credit='A' then 0
        when Credit='B' then 1
        when Credit='C' then 2
        when Credit='D' then 3
   end  as IndexCredit
   from Supp_Custom_TB order by Supp_Custom_NO