asp.net在iframe中弹出信息并执行跳转问题探讨

/// <summary>
/// iframe 中，弹出信息并跳转
/// </summary>
/// <param name="msg"></param>
/// <param name="targetPageName"></param>
public static void ResponseShowMsg(string msg, string targetPageName)
{
string str = "<script> alert({0}); window.parent.frames[\"sysMain\"].location.href = {1}; </script>";
string Urls = HttpContext.Current.Request.Url.OriginalString;
if (Urls.LastIndexOf(?) > 0)
{
Urls = Urls.Substring(0, Urls.LastIndexOf(?)).Replace(HttpContext.Current.Request.Url.Segments[HttpContext.Current.Request.Url.Segments.Length - 1], targetPageName);
}
else
{
Urls = Urls.Replace(HttpContext.Current.Request.Url.Segments[HttpContext.Current.Request.Url.Segments.Length - 1], targetPageName);
}
str = string.Format(str, msg, Urls);
HttpContext.Current.Response.Write(str);
}

protected void btnSave_Click(object sender, EventArgs e)
{
if (bll.RoleAdd(model, tempMs))
{
CmvspCommon.MessageBox.ResponseShowMsg( "保存成功！", "add.aspx");
}
else {
CmvspCommon.MessageBox.Show(this, "保存失败！");
}
}