//查询用户
    protected void Button1_Click(object sender, EventArgs e)
    {
        //输入异常检查
        string strIn = TextBox1.Text.Trim();
        //有点问题,数字挂字母??
        Regex r=new Regex(@"\d{1,100}");
        if(r.IsMatch(strIn) & (strIn.Length<5|strIn.Length>6))
        {
            if (Session["lang"].ToString() == "zh-cn")
                Response.Write("<script>alert('PSID的长度必须是5或者6!');window.location.href='./Query_employee.aspx'</script>");
            else
                Response.Write("<script>alert('The length of PSID must be 5 or 6!');window.location.href='./Query_employee.aspx'</script>");
            return;
        }

        Query qr = new Query();
        DataTable dt = new DataTable();
        DataTable dtEmployeeExist = new DataTable();
        //Query by PSID or Name
        if (r.IsMatch(strIn))
        {
            dt = qr.QueryByPSID(strIn);
            Session["PSID"] = strIn;
            dtEmployeeExist = qr.GetEmployeeByPSID(strIn);
        }
        else
        {
            dt = qr.QueryByName(strIn);
            Operation op = new Operation();
            Session["PSID"] = op.NameToPSID(strIn);
            dtEmployeeExist = qr.GetEmployeeByName(strIn);
        }

        //该employee不存在的处理
        if (dtEmployeeExist.Rows.Count == 0)
        {
            if (Session["lang"].ToString() == "zh-cn")
                Response.Write("<script>alert('" + TextBox1.Text.Trim() + " 不存在!');window.location.href='./Query_employee.aspx'</script>");
            else
                Response.Write("<script>alert('" + TextBox1.Text.Trim() + " does not exist!');window.location.href='./Query_employee.aspx'</script>");
            return;
        }

        //有该employee,但借阅记录为空的处理
        if (dt.Rows.Count == 0)
        {
            if (Session["lang"].ToString() == "zh-cn")
                Response.Write("<script>alert('" + TextBox1.Text.Trim() + " 没有借阅任何图书!');window.location.href='./Query_employee.aspx'</script>");
            else
                Response.Write("<script>alert('" + TextBox1.Text.Trim() + " did not borrow any book!');window.location.href='./Query_employee.aspx'</script>");
            return;
        }

        GridView1.DataSource = dt;
        GridView1.DataBind();
    }