无返回值关闭子窗口不刷新父页面

parent.aspx
<asp:TemplateField HeaderText="配置">
                                    <ItemStyle CssClass="gridView-item-align-l" />
                                    <HeaderStyle CssClass="gridView-Item-head" />
                                    <ItemTemplate>
                                        <%--<asp:LinkButton runat="server" ID="lnkConfig" Text="配置"></asp:LinkButton>--%>
                                        <asp:HyperLink ID="hlConfig" NavigateUrl='<%# Eval("CONFIG_SEQ","SystemConfigDetail.aspx?CONFIG_SEQ={0}")%>' runat="server">配置</asp:HyperLink>

                                    </ItemTemplate>
                                </asp:TemplateField>
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parent.aspx.cs
 HyperLink hlConfig = e.Row.FindControl("hlConfig") as  HyperLink;
            if (hlConfig != null)
            {
                string fea="dialogHeight:280px;dialogWidth:540px;status:no;";
                hlConfig.Attributes.Add("onclick", "var returnValue =window.showModalDialog('" + hlConfig.NavigateUrl + "',null,'" + fea + "') ;if(returnValue == 'tag_save'){location.href='SystemConfig.aspx';}");

                hlConfig.NavigateUrl = "#";
            }

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SystemConfigDetail.aspx

<base target="_self" />

<img style="cursor: hand" src="../images/button_close.gif" onclick="window.close()"  alt="" />
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SystemConfigDetail.aspx.cs

 if (result == 1)
            this.WriteOprLog("系统配置", this.UserID + strOprType + "配置成功！操作的配置记录号为" + CONFIG_SEQ);

        string message = "<script>alert('设置参数成功,请继续！');window.returnValue='tag_save';window.close();</script>";
        Page.RegisterStartupScript("closeMe", message);