Comments by Serenity1 (Top 10 by date)

Yes I have but sadly it didn't make a difference.
I believe that the problem is not the ajax but the threading of the application. I don't know why it has a 2 min delay and works afterwards but I'm pretty sure that I will need todo some threading.

I've tried Thread.Yield() (and still looking) but that doesn't allow other threads to execute.

No, they all successfully pass but are delayed when the big process starts (the excel import)
Edit. reply to previous q.
And they all fail? You'll want to post your code then.

Got the code now,
//Call back page WebForm1.aspx
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace IndyIIOrga.UserControls
{
public partial class WebForm1 : System.Web.UI.Page
{
public string sessionUserCID { get { if ( Session[ "UserCID" ] != null ) { return Session[ "UserCID" ].ToString() ?? "-1"; } else { return "-1"; } } set { Session[ "UserCID" ] = value; } }

protected void Page_Load( object sender, EventArgs e )
{
Random r = new Random();
//lblTesting.Text = string.Format( "{0}", cookieUserCID.ToString() );
lblTesting.Text = string.Format( "Indy is processing excel Line number {0}", sessionUserCID );
}

}
}

//Java that call the call back page
function SessionGetCookie()
{
$.ajax(
{
url: "../../UserControls/WebForm1.aspx",
type: 'post',
dataType: 'text',
cache: false,
success: function (data, textStatus, xhr)
{
$.cookie('UserCID', $( data ).text() );
}

});
}

//Code that loops to update the label
var sessionTimeoutWarning = 1; //1 minute
var sessionTimeout = 18;
var sTimeout = parseInt(sessionTimeoutWarning) * 10 * 1000; //Regular time is meant *60*100
setTimeout('SessionWarning()', sTimeout); //Java timer function

function SessionWarning()
{
SessionGetCookie();
$("#lblPosition9162wa").text( $.cookie('UserCID') );
setTimeout('SessionWarning()', sTimeout);

}

//Label on client machine
<asp:Label ID="lblPosition9162wa" ClientIDMode="Static" runat="server" Text="9999" >