gridview嵌套DropDownList選定值

有三種方法：
aspx:
                            <asp:TemplateField HeaderText="狀態" SortExpression="state">
                                <ItemStyle ForeColor="Gray" />
                                <ItemTemplate>
                                    <asp:Label ID="labstate" runat="server" Text='<%# (Eval("state").ToString() == "0") ? "已體檢" : "已合格"%>'></asp:Label>            
                                </ItemTemplate>
                           <EditItemTemplate>
                           <asp:HiddenField ID="hdstate" runat="server" Value='<%# Eval("state") %>' />
                                <asp:DropDownList ID="ddlstate" runat="server">
                                    <asp:ListItem Value="0">已體檢</asp:ListItem>
                                    <asp:ListItem Value="1">不合格</asp:ListItem>
                                </asp:DropDownList>
                            </EditItemTemplate>
                            </asp:TemplateField>
cs:
    protected void myGridView_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowIndex != -1)
        {
            int orderID = this.myGridView.PageIndex * this.myGridView.PageSize + e.Row.RowIndex + 1;
            e.Row.Cells[0].Text = orderID.ToString();
        }

        if (((DropDownList)e.Row.FindControl("ddlstate")) != null)
        {
            DropDownList ddlstate = (DropDownList)e.Row.FindControl("ddlstate");
            //ddlstate.SelectedValue = ((HiddenField)e.Row.FindControl("hdstate")).Value;
            //ddlstate.Items.FindByValue(((HiddenField)e.Row.FindControl("hdstate")).Value).Selected = true;
            SetSelectedItem(ddlstate, ((HiddenField)e.Row.FindControl("hdstate")).Value);
        }
    }
    private void SetSelectedItem(ListControl list, String value)
    {
        foreach (ListItem e in list.Items)
            if (e.Value == value)
            {
                e.Selected = true;
                return;
            }
            else
                e.Selected = false;
    }