Web Form with Progress Bar of Web Service Execution

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;

public partial class _Default : System.Web.UI.Page
{
    MyService.Test ts = new MyService.Test();
    MyService.ProgressValues pw = null;
    int steps = 5;
    int values = 10;
    protected void Page_Load(object sender, EventArgs e)
    {
        if (Page.IsPostBack == false)   // Page Loaded first time
        {
            CleanPage();                // Drop all values of progress bar to zero   
        }
    }
    private void CleanPage()
    {
        L_P1.Text = "";
        L_P2.Text = "";
        L_Status.Text = "";
        Div3.Visible = false;
        Div4.Visible = false;
        Div1.Style.Add(HtmlTextWriterStyle.Width, "0");
        Div2.Style.Add(HtmlTextWriterStyle.Width, "0");
        GridView1.DataSource = null;
        GridView1.DataBind();
    }
    protected void Timer1_Tick(object sender, EventArgs e)
    {
        IAsyncResult my_ar = (IAsyncResult)Session["my_ar"];            // Get IAsyncResult from Session
        pw = ts.GetProcessValues(Session["WebServiceUID"].ToString());  // Get ProgressValues from web service
        if (my_ar.IsCompleted)                                          // Async execution of service done
        {
            DataTable tbl = ts.EndGo(my_ar);                    // Get DataTable from web service
            if (tbl != null)                                    // Completed good
            {
                GridView1.DataSource = tbl;                     // Bind Grid to datasou
                GridView1.DataBind();                           // Bind Grid to data
                L_Status.Text = "Completed!";
                Timer1.Enabled = false;                         // Stop timer ticks
            }
            else                                                // Aborted by user
            {
                CleanPage();
                L_Status.Text = "Aborted by user!";
                Timer1.Enabled = false;                         // Stop timer ticks
                return;
            }
        }
        // Dispaley label text
        L_P1.Text = pw.step.ToString()+"/"+steps.ToString();
        L_P2.Text = pw.value.ToString()+"/"+values.ToString();
        // Refresh progress bar length
        Div1.Style.Value = "BACKGROUND-IMAGE: url(Images/SubBG2.jpg); width:" + (pw.step * (200/steps)).ToString() + "px; height:20px;";
        Div2.Style.Value = "BACKGROUND-IMAGE: url(Images/SubBG2.jpg); width:" + (pw.value * (200/values)).ToString() + "px; height:20px;";
    }
    protected void B_Start_Click(object sender, EventArgs e)
    {
        CleanPage();                            // Drop all values of progress bar to zero
        string UID = GetRandomName();           // Get random name for wev service instance
        Session["WebServiceUID"] = UID;         // Remember UID of a service in Session for later use
        IAsyncResult my_ar;                     // AsyncResult for async execution of service
        my_ar = ts.BeginGo(UID, steps, values, null, null);    // Start async execution of web service
        Session["my_ar"] = my_ar;               // Remember AsyncResult in Session for later use
        Div3.Visible = true;
        Div4.Visible = true;
        L_Status.Text = "In progress!";
        Timer1.Enabled = true;                  // Enable timer for partial page refreshes
    }
    protected void B_Stop_Click(object sender, EventArgs e)
    {
        if (Session["WebServiceUID"] != null)
            ts.Abort(Session["WebServiceUID"].ToString());
    }
    public string GetRandomName()
    {
        byte[] by = new byte[5];
        System.Random r = new Random();
        r.NextBytes(by);
        string o = "";
        foreach (byte b in by)
            o += string.Format("{0,0:X2}", (byte)b);
        return o.ToUpper();
    }
}