请帮忙，100分在线等！（重发，上个显示不出来）

Question

DropDownList1  绑定  SqlDataSource1    AutoPostBack="True"  
DropDownList2  绑定  SqlDataSource2，由  DropDownList1  传入参数，AutoPostBack="True"  
 
GridView1  绑定  SqlDataSource3，由  DropDownList2  传入参数，  
 
现在问题是，GridView1总不能保持最新数据显示，  
想在DropDownList2  或  SqlDataSource2  数据render以后再更新、执行    SqlDataSource3.databind()  
但不知道该如何写，  
请指教，多谢了！

Answer 1

GridView1.DataSource = SqlDataSource3;
GridView1.Databind;

Answer 2

在DropDownList2的selectedindexchanged事件中绑定GridView1不就可以了吗？

Answer 3

那就把GridView1的绑定写进render里面

Answer 4

DropDownList2改变，Gridview当然会改变，
关键时DropDownList1改变时，DropDownList2会改变，但Gridview不是每次都能及时改变的。
代码如下：
<asp:SqlDataSource ID="college" runat="server" ConnectionString="<%$ ConnectionStrings:newdata-cetConnectionString %>"
                SelectCommand="SELECT [dm_mc], [xy_dm] FROM [a_xy]"  >
          </asp:SqlDataSource>   <asp:SqlDataSource ID="depart" runat="server" ConnectionString="<%$ ConnectionStrings:newdata-cetConnectionString %>"
                  SelectCommand="SELECT [zy_dm], [dm_mc] FROM [a_zy] where [zy_dm] Like @zy_dm" >
                  <SelectParameters>
                      <asp:ControlParameter ControlID="DropDownList1" Name="zy_dm" PropertyName="Value" />
</SelectParameters>
              </asp:SqlDataSource>
              
              
        <asp:SqlDataSource ID="detail" runat="server" ConnectionString="<%$ ConnectionStrings:newdata-cetConnectionString %>"
            SelectCommand="SELECT [姓名], [ID], [学号], [证件号码], [报考级别], [fee] FROM [dida_cet] where 报考级别=@band) order by ID">
            <SelectParameters>
                <asp:ControlParameter ControlID="DropDownList2" DefaultValue="" Name="band" PropertyName="SelectedValue" />
            </SelectParameters>
        </asp:SqlDataSource>
<asp:DropDownList ID="DropDownList1"
                runat="server" DataSourceID="college" DataTextField="dm_mc" DataValueField="xy_dm" AutoPostBack=true>
            </asp:DropDownList>
            
<asp:DropDownList ID="DropDownList2" runat="server"
                  DataSourceID="depart" DataTextField="dm_mc" DataValueField="zy_dm" AutoPostBack=true >
              </asp:DropDownList>        <asp:GridView ID="GridView1" runat="server" AllowPaging="True" AutoGenerateColumns="False"
            DataKeyNames="ID" DataSourceID="detail" Width="300" AllowSorting="True">
            <Columns>
                <asp:BoundField DataField="ID" HeaderText="流水号" ReadOnly="True" SortExpression="ID" />
            </Columns>
        </asp:GridView>

Answer 5

搞掂
protected void tester_college_SelectedIndexChanged(object sender, EventArgs e)
    {
        depart.DataBind();
        tester_spec.DataBind();
        detail.DataBind();
        GridView1.DataBind();
    }