Managing ASP.NET Session Problems in Several Tabs of the Browser: Making Sure Popups Have Correct User Data

It can be challenging to manage user sessions across several browser tabs in contemporary web applications, particularly when you wish to display dynamic user data via pop-ups like an application form. This blog post will examine a typical ASP.NET session problem and offer a thorough, step-by-step fix.

The Scenario
Imagine this situation:

• Tab 1: User A logs in.
• Tab 2: User B logs in in the same browser.
• You return to Tab 1 and try to apply IPO.

Problem
The pop-up shows User A’s name (from page load).
Backend, however, processes User B’s session data (because the session is shared across tabs).

This mismatch can confuse users and cause data integrity issues.

Why This Happens
ASP.NET sessions are per browser, not per tab.
Tab 1: logs in as User A → Session["ClientFname"] = "A".
Tab 2: logs in as User B → Session["ClientFname"] = "B".
Both tabs now share the same session cookie.

Result: Frontend shows old cached data (User A), while the backend processes the latest session (User B).

Goal
We want to ensure that:

• The frontend popup always shows the correct client details.
• The backend request corresponds to the same user shown in the pop-up.
• Solution: Fetch Data Dynamically from Backend

The most reliable approach is to fetch user session data dynamically from the server when the pop-up is triggered. This ensures the displayed data always matches the backend session.

Step 1. Add a WebMethod in ASP.NET

In your ASPX code-behind, create a WebMethod to return session data:

[System.Web.Services.WebMethod]
public static object GetClientSessionData()
{
    try
    {
        string name = HttpContext.Current.Session["ClientFname"]?.ToString() ?? "";
        string pan = HttpContext.Current.Session["Pan"]?.ToString() ?? "";
        string dp = HttpContext.Current.Session["Depository"]?.ToString() ?? "";

        return new
        {
            ClientFname = name,
            Pan = pan,
            Depository = dp
        };
    }
    catch (Exception ex)
    {
        return new { Error = ex.Message };
    }
}

Tip: You can also create a strong-typed class for clarity instead of returning an anonymous object.

Step 2. Call the WebMethod from JavaScript

When the user clicks Apply IPO, call the WebMethod to get the current session data:

When the user clicks Apply IPO, call the WebMethod to get the current session data:

function submitalldata() {
    // Get UPI ID entered by user
    var UPIID = document.getElementById("<%=txtupiid.ClientID%>").value;

    // Call backend WebMethod to get session data
    $.ajax({
        type: "POST",
        url: "ApplyIPO.aspx/GetClientSessionData",
        data: '{}',  // no parameters needed
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        success: function (response) {
            var data = response.d;

            if (data.Error) {
                alert("Error: " + data.Error);
                return;
            }

            // Populate popup fields with session data
            document.getElementById("clname").innerText = data.ClientFname;
            document.getElementById("clpan").innerText = data.Pan;
            document.getElementById("cldpid").innerText = data.Depository;
            document.getElementById("clupi").innerText = UPIID;
            document.getElementById("clupiname").innerText = data.ClientFname; // optional if needed

            // Show popup modal dynamically
            $('#conformModalpopup').modal('show');
        },
        error: function (xhr, status, error) {
            console.error("Error fetching session data:", error);
        }
    });

    // Prevent full postback
    return false;
}

Step 3. What Happens Now

The popup always fetches current session data from the backend.

Even with multiple tabs open, the correct user details are shown.

You avoid mismatches between frontend and backend.

ASPX Markup (Frontend)

<!-- Apply Button -->

<div class="modal-footer">

<a id="applybtn" runat="server" onclick="return submitalldata();">APPLY</a>

</div>

<!-- Popup Modal -->

<div class="modal fade" id="conformModalpopup" role="dialog" aria-labelledby="exampleModalCenterTitle">

<div class="modal-dialog modal-dialog-centered" role="document">

<div class="modal-content newboarderradius modalfooterclass">

<div class="modal-header popupheader">

<h5 class="modal-title"><b>Client Details Verification</b></h5>

<button type="button" class="close clientpopupclose btn-close" data-bs-dismiss="modal" aria-label="Close">

<span>&times;</span>

</button>

</div>

<div class="modal-body">

<div class="verification">

<table class="usertblvalidation">

<tr>

<td class="useralignment">Client Name</td>

<td>:</td>

<td id="clname" runat="server" class="useralignment"></td>

</tr>

<tr>

<td class="useralignment">Pan No</td>

<td>:</td>

<td id="clpan" runat="server" class="useralignment"></td>

</tr>

<tr>

<td class="useralignment">DP ID</td>

<td>:</td>

<td id="cldpid" runat="server" class="useralignment"></td>

</tr>

<tr>

<td class="useralignment">UPI ID</td>

<td>:</td>

<td id="clupi" class="useralignment"></td>

</tr>

<tr>

<td class="useralignment">UPI ID Name</td>

<td>:</td>

<td id="clupiname" class="useralignment"></td>

</tr>

</table>

</div>

</div>

<div class="modal-footer verifiedfooter">

<div class="footerbtnopenclose">

<button type="button" class="btn btn-white verificationpopup" data-bs-dismiss="modal" id="cancelbtn">Cancel</button>

<button type="button" class="btn btn-white modify-popup verificationpopup" id="confirm_txt" onclick="message();">Confirm</button>

</div>

<div class="input-container upidivcontent">

<label id="conform_txtbx"></label>

</div>

</div>

</div>

</div>

</div>

How It Works?

You click “APPLY”.

submitalldata() runs → calls backend method GetClientSessionData().

The server sends back the current session user info (ClientFname, PAN, etc.).

JavaScript fills your modal table dynamically.

Bootstrap modal (#conformModalpopup) opens showing correct data.

No full postback — everything happens via AJAX. 

Windows Hosting Recommendation

HostForLIFE.eu receives Spotlight standing advantage award for providing recommended, cheap and fast ecommerce Hosting including the latest Magento. From the leading technology company, Microsoft. All the servers are equipped with the newest Windows Server 2022 R2, SQL Server 2022, ASP.NET Core 10.0 , ASP.NET MVC, Silverlight 5, WebMatrix and Visual Studio Lightswitch. Security and performance are at the core of their Magento hosting operations to confirm every website and/or application hosted on their servers is highly secured and performs at optimum level. mutually of the European ASP.NET hosting suppliers, HostForLIFE guarantees 99.9% uptime and fast loading speed. From €3.49/month , HostForLIFE provides you with unlimited disk space, unlimited domains, unlimited bandwidth,etc, for your website hosting needs.