数据绑定错误

Question

错误:DataBinding: 'System.Data.DataRowView' does not contain a property with the name 'N_tid'. 
Line 73:  <asp:TemplateField HeaderText="新闻类型">
Line 74:  <EditItemTemplate>
Line 75:      <asp:DropDownList ID="DropDownList1" runat="server" 
Line 76:      DataSourceID="AccessDataSource2" DataTextField="N_type"  
Line 77:       DataValueField="N_tid" SelectedValue='<%# Bind("N_tid") %>'>是一个DetailsView编辑模式下的下拉框里面的内容,有问题的代码:
                        <asp:TemplateField HeaderText="新闻类型">
                            <EditItemTemplate>
                              <asp:DropDownList ID="DropDownList1" runat="server" 
                                DataSourceID="AccessDataSource2" DataTextField="N_type"  
                                DataValueField="N_tid" SelectedValue='<%# Bind("N_tid") %>'>
                                </asp:DropDownList>
                                <asp:AccessDataSource ID="AccessDataSource2" runat="server" 
                                DataFile="~/hdu.mdb" SelectCommand="SELECT * FROM [ntype]">
                                </asp:AccessDataSource>                                
                            </EditItemTemplate>
但是用了同样语句的另一个模块却没有问题:
                            <InsertItemTemplate>
                                <asp:DropDownList ID="DropDownList2" runat="server" 
                                DataSourceID="AccessDataSource3" DataTextField="N_type"  
                                DataValueField="N_tid"  SelectedValue='<%# Bind("N_tid") %>'>
                                </asp:DropDownList>
                                <asp:AccessDataSource ID="AccessDataSource3" runat="server" 
                                DataFile="~/hdu.mdb" SelectCommand="SELECT * FROM [ntype]">
                                </asp:AccessDataSource>
                            </InsertItemTemplate>

Answer 1

  DataValueField="N_tid" SelectedValue=' <%# Bind("N_tid") %>'> 
改为
  DataValueField="N_tid" SelectedValue=' <%# Eval("N_tid") %>'> 

Answer 2

DataValueField="N_tid" SelectedValue=' <%# Eval("N_tid") %>'> 
或者是：
DataValueField="N_tid" SelectedValue=' <%#DataBinder.Eval(DataItem,Container,"N_tid") %>'> 

Answer 3

好像这两种都不行誒,真奇怪,insert那里就可以

Answer 4

我明白了,edit模式的数据要从detailsView的dataSource获得,不能新建一个Datasource