.net 6 core web app object variables entered on web page on one computer show up on page on different computer?

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I hope I explain this well. I have been developing websites with ASP.NET Core 6 C# in Visual Studio for some time. I just realized with a site I am working on now that information entered and stored from a form into objects that I then read and display on another page from one computer will show up if I pull that display page up on a different computer. For example, if I have an input for firstname, public string firstname, and a button which submits the name from the input into firstname, then displays the name on a new page, @Model.firstname, then goes to a different computer and pulls that page up, the name shows up. I guess I always assumed the server, IIS, created new instances of the site objects when someone else on a different computer or browser pulled the site up. Now I am unsure of exactly how things are working on the server, IIS. Hope someone can help me out and explain what is going on. Let me know if I need to send more information.

What I have tried:

Using session variable objects.

Posted 16-Oct-23 23:26pm

brian5795

Updated 25-Oct-23 4:07am

Deeksha Shenoy

v2

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Comments

Richard MacCutchan 17-Oct-23 6:50am

There is something seriously wrong in your backend code, if it can capture data from one user and display it to another.

brian5795 17-Oct-23 7:04am

Yes thanks, that is i guess what i am trying to figure out. Like i stated before, i thought that instances of the web app would be created for each computer or browser accessing the app on iis, so that if you pull up the form, and i pull up the form, there are separate instances of the objects created, but it seems i am wrong about that assumption.

Dave Kreskowiak 17-Oct-23 9:56am

Well, since nobody can see your code, because you haven't posted any of the code that handles user data, it's impossible for anyone to tell you what you did wrong.

brian5795 17-Oct-23 20:41pm

Just to clarify, i am not using user data at this point. Just in the most simplistic form, i have one page

orderform.cshtml

function Update() {

document.getElementById('input-div').style.backgroundColor = 'green';

var firstnamein = document.getElementById('firstname').value;

var fileform = new FormData;

fileform.append("firstnamein", firstnamein);

$.ajax(
{
url: "./orderform?handler=Update",
type: 'POST',
data: fileform,
async: true,
cache: false,
contentType: false,
processData: false,
beforeSend: function (xhr) {
xhr.setRequestHeader("XSRF-TOKEN", $('input:hidden[name="__RequestVerificationToken"]').val());
},

success: function (Return) {

}

});

document.getElementById('input-div').hidden = true;

document.getElementById('confirm-div').hidden = false;

$('#confirm-div').load('./orderview');
}

orderform.cshtml.cs

public class orderformModel : PageModel
{
public static string firstname { get; set; }
public void OnGet()
{
}

public async Task<iactionresult> OnPostUpdateAsync(string firstnamein)
{
firstname = firstnamein;

return Content("OK");
}

}

and then

orderview.cshtml

@page
@{
Layout = "_PlainLayout";
}

Hello @orderformModel.firstname

So with this, if you go to orderform, enter name, and click next, it will bring up the orderview with Hello 'firstname'. when run on the server iis and you go to the page on one computer and put name in and click next it will show the name entered. But you also can go to a different computer then and pull up orderview and it will show the name entered on the other computer. So i believe i am missing some fundamental property of web apps and iis. Like i said i always believed that iis created a new instance of the objects or app so that new connections would not share data. I hope that makes sense.

Dave Kreskowiak 18-Oct-23 0:58am

public static string firstname { get; set; }

The "static" keyword means the variable is shared between all instances of the class it's contained in. Remove the static keyword and the sharing goes away.

brian5795 18-Oct-23 1:17am

Ok i understand that but my question then is in understanding how this works in say production on live server iis, when say two people are accessing the site at the same time this object will contain the last value entered for both people. Like i said i thought the application on the iis server would create a new instance for each person but i guess it doesn't. I am not sure how to deal with that. I always thought when someone accessed a web app from iis that it would be a new instance isolated from others. Now i realize that they are not. I was using static for a different reason and i can probably find another way to do what i want to do, but it just shed some light on the effects on serving a site live. I didnt know it would act that way, as in the data entered into that object by one person is accessable to all. I just thought the 'static' would be available to its own instance of the app by say an individual browser. Any thoughts?

Dave Kreskowiak 18-Oct-23 9:27am

It does create a new instance for each person. If a variable is static, that variable is shared between all instances of the class. If you don't want data shared between all users, don't make the variables static.

You have to keep in mind that a web environment works in a request/response fashion. When a request for a page or data comes in, none of your classes exist as objects. The page class instance is created, executed, and any classes that are required are created and used, and when the response is sent back to the client, everything is torn back down. All of your code only exists for the duration of one request. The exception to that is anything that's static.

brian5795 17-Oct-23 20:43pm

sorry i am new to this forum so i am not sure how to post the code to look better than that. hope you can follow.

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M Imran Ansari · Answer 1 · 2023-10-16T23:52:00

If you're experiencing issues with session variables not behaving as expected, it's important to check if you are correctly using and managing the session in your ASP.NET Core application. Here are some common steps to troubleshoot issues with session variables:
Make sure that the session has been properly configured in your application's Startup.cs file. You need to add the session middleware and configure it as follows:

C#

public void ConfigureServices(IServiceCollection services)
{
    // Add session services
    services.AddSession(options =>
    {
        options.IdleTimeout = TimeSpan.FromMinutes(30);
        options.Cookie.HttpOnly = true;
        options.Cookie.IsEssential = true;
    });

    // Other configurations...
}

public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
    // Use session
    app.UseSession();

    // Other configurations...
}

If you're still encountering problems, kindly provide more specific details about the issues you're facing, including any error messages, This additional information can help in diagnosing and resolving the issues related to using session variables in your ASP.NET Core application.