我更改了ObjectDataSource'；s SelectMethod，但它仍然返回GridView上的旧值

我有两个不同的类要在ObjectDataSource:中使用

"getColection"answers"getLastColectionByUser"

这是我在aspx上的ObjectDataSource。

`

  <asp:ObjectDataSource ID="ObjectDataSource1" runat="server"          SelectMethod="getColection"TypeName="HepatiteNegocio.ViewProtocoloCol" SelectCountMethod="getColectionCount"
    EnablePaging="True">
    <SelectParameters>
        <asp:Parameter Name="pWhere" Type="String" />
        <asp:Parameter Name="pOrderBY" Type="String" />
        <asp:Parameter Name="startRowIndex" Type="Int32" />
        <asp:Parameter Name="maximumRows" Type="Int32" />
    </SelectParameters>
</asp:ObjectDataSource>`

如果单选按钮选择的值是"all"，则选择方法是"getColection"，否则是"getLastColectionByUser"，好吗？

          `if(radioButton.SelectedValue.Equals("all"))
        {
            ObjectDataSource1.SelectMethod = "getColection";
            ObjectDataSource1.SelectCountMethod = "getColectionCount";
            try
            {
                validation();
                ObjectDataSource1.SelectParameters[0].DefaultValue = getWhere();
                ObjectDataSource1.SelectParameters[1].DefaultValue = "protocolNumber";
            }
            catch
            {
                set an error message
            }
        }
        else  
        {
            ObjectDataSource1.SelectMethod = "getLastColectionByUser";
            ObjectDataSource1.SelectCountMethod = "getLastCountColectionByUser";
            try
            {
                validation();
                ObjectDataSource1.SelectParameters[0].DefaultValue = getWhere();
                ObjectDataSource1.SelectParameters[1].DefaultValue = "protocolNumber";
            }
            catch
            {
                set an erron message
            }
        } 
        ObjectDataSource1.DataBind();
        GridView1.DataBind();`

当我调试时，它运行良好。SelectMethod和SelectCountMethod正在更改，但gridView仍显示旧值。课程还可以。出了什么问题？