How to notify a user after some time that gridview is updated

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C#2.0

C#

SQL-Server-2008

ASP.NET4

Hi coder i have an application in which i have different pages

On my first page: i have form. When i enter details and click on submit button data store in database.

On my second page i have a grdiview where i can view details from database of the form I have an edit link on that when i click on edit link it will redirect to form page where submit button become updated button and user can update details.

Now what i want is after one hour of modification other user of the application get a notification on report page that updation is being done. I dont want to user sqldependency

This is form page code:

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        lblFirstName.Text = Session["FirstName"].ToString();
        if (Session["portal"] != null)
        {
            ddlPortal.SelectedIndex = ddlPortal.Items.IndexOf(ddlPortal.Items.FindByValue(Convert.ToString(Session["portal"])));
        }
        if (!string.IsNullOrEmpty(Request.QueryString["buttonValue"]))
        {
            string btnValue = Request.QueryString["buttonValue"];
            if (btnValue == "Update")
            {
                btnSubmit.Text = "Update";
            }
            else if (btnValue == "Submit")
            {
                btnSubmit.Text = "Submit";
            }
            else
            {
                Response.Write("error");
            }
        }
        else
        {
            this.btnSubmit.Text = "Submit";
        }
        string ID = Request.QueryString["ID"];
        cmd = new SqlCommand("Select * from Form where ID='" + ID + "'", con);
        con.Open();
        da = new SqlDataAdapter(cmd);
        dt.Clear();
        da.Fill(dt);
        if (dt.Rows.Count > 0)
        {
            ddlPortal.SelectedValue = dt.Rows[0][2].ToString();
            tbTid.Text = dt.Rows[0][3].ToString();
            tbPNR.Text = dt.Rows[0][4].ToString();
            tbTicketNumber.Text = dt.Rows[0][5].ToString();
            tbESACCode.Text = dt.Rows[0][6].ToString();
            tbWaiverCode.Text = dt.Rows[0][7].ToString();
            tbRemarks.Text = dt.Rows[0][8].ToString();
            tbUnusedTicketAmount.Text = dt.Rows[0][9].ToString();
            ddlUnusedAmount.SelectedValue = dt.Rows[0][10].ToString();
            tbAirlinePenality.Text = dt.Rows[0][11].ToString();
            ddlAirlinePenality.SelectedValue = dt.Rows[0][12].ToString();
            tbNetRefundProcess.Text = dt.Rows[0][13].ToString();
            ddlNetRefundProcess.SelectedValue = dt.Rows[0][14].ToString();
            tbRefundableCommision.Text = dt.Rows[0][15].ToString();
            ddlRefundableCommission.SelectedValue = dt.Rows[0][16].ToString();
            tbCouponRefund.Text = dt.Rows[0][17].ToString();
            ddlRefundType.SelectedValue = dt.Rows[0][18].ToString();

        }
        con.Close();
    }
    if (ddlPortal.SelectedValue == "Select")
    {
        FirstForm.Visible = false;
    }
}
private void Submit()
{
    //store date and time on click event of button
    //DateTime clicktime = DateTime.Now;
    string d = DateTime.Now.ToString();
    using (SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["BartConnectionString"].ToString()))
    {
        con.Open();
        string Name = lblFirstName.Text;
        string Portal = ddlPortal.SelectedValue;
        string TID = tbTid.Text;
        string PNR = tbPNR.Text;
        string TicketNumber = tbTicketNumber.Text;
        string ESACCode = tbESACCode.Text;
        string WaiverCode = tbWaiverCode.Text;
        string Remarks = tbRemarks.Text;
        string UnusedTicketAmount = tbUnusedTicketAmount.Text;
        string UnusedAmount = ddlUnusedAmount.SelectedValue;
        string AirlinePenality = tbAirlinePenality.Text;
        string Airline = ddlAirlinePenality.SelectedValue;
        string NetRefundProcess = tbNetRefundProcess.Text;
        string NetRefund = ddlNetRefundProcess.SelectedValue;
        string RefundableCommission = tbRefundableCommision.Text;
        string Refundable = ddlRefundableCommission.SelectedValue;
        string CouponRefunded = tbCouponRefund.Text;
        string RefundType = ddlRefundType.SelectedValue;

        using (SqlCommand cmd = con.CreateCommand())
        {
            cmd.CommandText = "insert into Form(Name,Portal,TID,PNR,TicketNumber,ESACCode,WaiverCode,Remarks,UnusedTicketAmount,ddlUnusedAmount, AirlinePenality, ddlAirlinePenality, NetRefundProcess, ddlNetRefundProcess, RefundableCommission, ddlRefundableCommission, CouponRefunded,RefundType,DateTime) values('" + Name + "','" + Portal + "','" + TID + "','" + PNR + "','" + TicketNumber + "', '" + ESACCode + "', '" + WaiverCode + "', '" + Remarks + "','" + UnusedTicketAmount + "','" + UnusedAmount + "','" + AirlinePenality + "','" + Airline + "','" + NetRefundProcess + "','" + NetRefund + "','" + RefundableCommission + "','" + Refundable + "','" + CouponRefunded + "','" + RefundType + "','" + d + "')";
            cmd.Parameters.AddWithValue("@Name", lblFirstName.Text.Trim());
            cmd.Parameters.AddWithValue("@Portal", ddlPortal.SelectedIndex);
            cmd.Parameters.AddWithValue("@TID", tbTid.Text.Trim());
            cmd.Parameters.AddWithValue("@PNR", tbPNR.Text.Trim());
            cmd.Parameters.AddWithValue("@TicketNumber", tbTicketNumber.Text.Trim());
            cmd.Parameters.AddWithValue("@ESACCode", tbESACCode.Text.Trim());
            cmd.Parameters.AddWithValue("@WaiverCode", tbWaiverCode.Text.Trim());
            cmd.Parameters.AddWithValue("@Remarks", tbRemarks.Text.Trim());
            cmd.Parameters.AddWithValue("@UnusedTicketAmount", tbUnusedTicketAmount.Text.Trim());
            cmd.Parameters.AddWithValue("@ddlUnusedAmount", ddlUnusedAmount.SelectedIndex);
            cmd.Parameters.AddWithValue("@AirlinePenality", tbAirlinePenality.Text.Trim());
            cmd.Parameters.AddWithValue("@ddlAirlinePenality", ddlAirlinePenality.SelectedIndex);
            cmd.Parameters.AddWithValue("@NetRefundProcess", tbNetRefundProcess.Text.Trim());
            cmd.Parameters.AddWithValue("@ddlNetRefundProcess", ddlNetRefundProcess.SelectedIndex);
            cmd.Parameters.AddWithValue("@RefundableCommission", tbRefundableCommision.Text.Trim());
            cmd.Parameters.AddWithValue("@ddlRefundableCommission", ddlRefundableCommission.SelectedIndex);
            cmd.Parameters.AddWithValue("@CouponRefunded", tbCouponRefund.Text.Trim());
            cmd.Parameters.AddWithValue("@RefundType", ddlRefundType.SelectedIndex);
            cmd.ExecuteNonQuery();
        }
        con.Close();
        tbTid.Text = "";
        tbPNR.Text = "";
        tbTicketNumber.Text = "";
        tbESACCode.Text = "";
        tbWaiverCode.Text = "";
        tbRemarks.Text = "";
        tbRemarks.Text = "";
        tbUnusedTicketAmount.Text = "";
        tbAirlinePenality.Text = "";
        tbNetRefundProcess.Text = "";
        tbRefundableCommision.Text = "";
        tbCouponRefund.Text = "";
        lblRefundType.Text = "";
        tbTid.Focus();
    }
}
private void Update()
{
    con.Open();
    string id = Request.QueryString["ID"].ToString();
    string d = DateTime.Now.ToString();
    string query = "update Form set Portal='" + ddlPortal.SelectedValue + "',Tid='" + tbTid.Text + "',PNR='" + tbPNR.Text + "',TicketNumber='" + tbTicketNumber.Text + "',ESACCode='" + tbESACCode.Text + "',WaiverCode='" + tbWaiverCode.Text + "',Remarks='" + tbRemarks.Text + "',UnusedTicketAmount='" + tbUnusedTicketAmount.Text + "',ddlUnusedAmount='" + ddlUnusedAmount.SelectedValue + "',AirlinePenality='" + tbAirlinePenality.Text + "',ddlAirlinePenality='" + ddlAirlinePenality.SelectedValue + "',NetRefundProcess='" + tbNetRefundProcess.Text + "',ddlNetRefundProcess='" + ddlNetRefundProcess.SelectedValue + "',RefundableCommission='" + tbRefundableCommision.Text + "',ddlRefundableCommission='" + ddlRefundableCommission.SelectedValue + "',CouponRefunded='" + tbCouponRefund.Text + "',RefundType='" + ddlRefundType.SelectedValue + "',DateTime='" + d + "' where ID='" + id + "'";
    cmd = new SqlCommand(query, con);
    cmd.CommandType = CommandType.Text;
    cmd.ExecuteNonQuery();
    con.Close();
    Response.Redirect("~/Admin/PortalReport.aspx", false);
}
protected void btnSubmit_Click(object sender, EventArgs e)
{
    if (btnSubmit.Text == "Submit")
    {
        this.Submit();
    }
    else if (btnSubmit.Text == "Update")
    {
        this.Update();
    }
}

How can i notify other user of this application that some data is updated after one hour i just want to show an message on a label may be that some data is updated to other user apart from the user that make modification

Thanks in advance !!