protected void loginUser(object sender, EventArgs e)
    {
        _userAccount = Request.Form["input_userAccount"];
        _passWord    = Request.Form["input_password"];

        login_result = DataBaseTools.LoginForUser(_userAccount, _passWord);

        if (login_result == 1)
        {
            Session["UserAccount"] = _userAccount;
            Response.Redirect("userIndex.aspx");
            return;
        }
        else
        {
            Response.Write("<script>alert('账号或者密码出错');</script>");
            return;
        }
    }