I'm developing web application with concurrent user using the application. The problem i'm facing is that if the first user login his details are taken affecting the second user how is process the data in the application.How to avoid it?the best way to code to maintain concurrent users.
View 4 RepliesI am trying to create a system in which there will be a single user accessing his acount from two endpoints simultanously.
I think this is possible.
1) How to restrict the user to have only one session at a time?
2) How to change it to have limited number of sessions per user at a time?
I'm looking for exampe of user managenet (login / registration / recover pass ...)
that is written in 3 layer architecture.
I am stuck with the issue of concurrent access to Session object. Actually my problem is i m writing to session in frame1 and trying to access that same Session object at the same time in Frame2's Page. I know about the reader/writer lock. I made the enablesessionstate = readonly in the page where i m writing to session. its giving me strange behavior on IE and firefox.
Its working concurrently in IE8 ( means page2 is diplaying modified values while page1 is changing the session object) but does not work in Firefox even page load is not called untill function on page 1 completed. Either anyone can fix my issue with firefox or there is new solution to reader/writer lock so that i can read the session at the same time while writing.
I am involved in designing a asp.net webforms application using .NET 3.5. I have a requirement where we need to log exceptions.
What is the best approach for exception handling, given that there would be concurrent users for this application?
Is there a need or possibility to log in exceptions at a user level? My support team in-charge wants to have a feature where the support team can get user specific log files.
To give you a background, this application is currently on VB 6.0 and we are migrating it along with some enhancements. So, today the support personnel have a provision to get user specific log files.
If multiple users access a web-form at the same time, how can I allow that using my code? Essentially each user reads and writes one variable in the application, and concurrent access is causing problem there.
View 5 RepliesIn my ASP.NET MVC2 web app I have a page which goes off and gets results from a number of different web service feeds. These return times vary so I want to basically display them as they return after the page loads. I also want my user to be able to kick of requests that can run concurrently with these other requests.
At the minute my page just seems to queue up the requests. The web service calls returning one at a time in the order they are called and then the user can kick of requests.
Is this a case for the asyncController or is there an easier/better way of working this?
How to avoid concurrent login for same user?
View 1 RepliesMy application is windows authenticated. The application pulls JUST the userName from the current windows account. Then I provide site access to this user depending on his account privileges. If his userName belongs to the admins list he is directed to admin screens. If his username belongs to users list he is directed to users screens. I handle this security in C# and some SQL tables(No membership provider and no Active directory security in the app).
I need to be able to prevent multiple concurrent logins for the same userName.
where they have used SQL server state management on a 3 tiered architectuere ?How should one implement (SQL server state management) without bypassing the middlelayer.
View 1 RepliesIs it possible to perform user management (store user info, login , logout etc) without using session or cookie?
View 3 RepliesI am a little bit new at handling multiple sessions congruently.
Basically i have created a chat application. In which i have a moderator page.
Now the moderator has the privilege to block particular users from the chat. Every user including the moderator has a session variable defined as Session["UserID"].
e.g for the username "moderator" the Session["UserID"]=moderator.
Now as i am logged in as the moderator how do i delete the session of a particular user whom i want to block the chat from commencing.
I'm building a site that can possibly have millions of users (yes ambitious!). Each user can upload an image or two for his/her profile. How would you architect the directories to support this type of thing? I was thinking of having a users subfolder off the root dir where each user will have their own sub-dir that corresponds to their userId created at registration time. I could then upload their profile pics to their corresponding sub-directory under the users dir. Seems straightforward but am I missing anything? Can I have a million sub-dirs under the user dir? NTFS supports it so my guess is YES.
View 2 RepliesI am working on a web application project with a layered architectural style having DAL, BLL, Service Layer and Presentation Layer. It's going to be a Web forms application.
My intent is to try using some of the new features of .Net 3.5 or 4.0.
Currently, I am thinking through different approaches for implementing Authentication in this project.
I have a query regarding the design of the application, particularly Authentication.
In which layer should I have Authentication class? BLL? If I implement the Authentication class in BLL, should I be having an app.config in the same class library project to contain the Database connection string and all.
I have a user object and each user.. has a parent! Of course one user must be the exception, can't be a rule without exceptions.
What to do with the user that has no 'parent'?
1. Create a constant/global SystemUser whose parent is NULL
2. Allow any User's parent to be NULL and hope that only 1 user ever will have a NULL parent
3. Allow a User to be their own parent implying they are the top of the food chain
Really not sure what the best strategy is here, the users will be stored in a table along with their parent user's ID. Each user has one and only one immediate parent.
I've got a web application that runs of a state server. It looks like soon it may need to distributed and there will be two web servers behind a load balancer.
This works great for session state but my next challenge is Cache
My application leverages heavily of cache. I understand ASP.Net 4.0 will be offering more here but nothing much has been said about the how too.
There are two challenges that I face
1). Each webserver will have its own copy of cache whereas it would be more efficient to put this to a third server the same as session state is put to state server.
2). The real challenge is keeping cache in sync if a simple dataset derived from the database is changed my code dumps that cache item and reloads the cache. That's all well on one webserver but webserver number two wont know to drop that particular cache item and reload it. This could cause some unexpected problems in the application.
For scenario number 2 I could attempt to do some smart coding so server number two knows to dump the cache and reload it.
My guess is someone else has already been here before and there's probably a better implementation approach rather than writing extra code.
Does anyone know how I could achieve the goal of keeping Cache in sync between multiple webservers or even better farm Cache management to another server?
My boss asked me to develop an API library for user registration. I am planning to write it in C#, compile it into DLL, and then give DLL to other groups to use it in a web (ASP.Net) application.
View 4 RepliesI reffer users from my website to another website (not my own website, I dont have any access to code).How can I detect a user registered in this website I have reffered to....
View 2 RepliesI'm building a web app (VS2010, C#, .NET 4.0) and am aiming to make heavy use of objects. One particular object will be a 'user' object. One of the properties I am exposing for the object is the users Status (e.g. Pending, Active, Suspended, Expired). In the front end this status will be editable and I don't want users of the app to enter invalid statuses (Pendong, New, etc.). I could hard code the valid statuses in the front end making use of a radiobutton list or dropdownlist, but that isn't logically where the valid values should be defined, I would have thought that the objects class would be a better place.Now this leave me with two problems:
Which is the best place to define the valid values? If I add them to the class, how do I read and present them in the front end?I'm hoping that you guys can put me straight here. Are any of my ideas architectually correct, or if not then what would be better.
Let me tell you what I need to implement on my company .NET application and I will be more than glad to hear your advise how to do it:
For every user loged-in to the company website, We want to know on which page he is right now. It means, If user X is now on page "1.html", I need to save this information somewhere. If user X after 30-60 seconds going to page "2.html" I want to update it fast where he is now surfing. It means I want to be able to tell at REAL TIME, on each page, Which users are right now observing the page. This is the problem, now I'm looking for the right solution.
If some day my company website will have 400,000 user log-in at the same time, I am going to save to every one of them where he is surfing right now. Maybe I exaggerated, but we do have 45,000 users at the same time on the company web site and the number is growing. I think big so the solution for this problem will be good for a lot of users.
So, my data object for every user should keep this information somewhere:
1. User code (User Number).
2. Which page user is now observing (Page Number).
This object is going to update every 30-60 seconds by using AJAX, so it should be updated fast. It is a lot of reading/writing data. If a user want to see which other users are now on the same page as he his, he will be able to see it, just by going through the whole array of objects.
I don't need this information to be saved in DB, because it doesn't mean anything. It is temporary and changing A LOT. So, I think the right place to do it is using RAM at the the company server, using the Caching Data option. What do you think? Am I wrong?
If I am going to have a data table with lots of records and every record is going to be update every 30-60 seconds. Where should I save all this table data? I am using SQL Server 2008 to save important data as needed, but this data is not important to save, just need to use it for my purpose. Where should I save this data? I think saving it in DB is a bad idea, because of the dynamic update of records every few seconds. I am thinking about 100,000 users who update this table every few seconds. It probably going to kill my DB, so DB is not an option.
What is the right way to implement this kind of thing?
You may think of it like every page is "a chat room" and I want to know who enter now the room (the page), it doesn't have to be completely accurate in time, but approximately.
Problem Statement: I have a details web page which has a unique sesssion ID generated per user. Now if a user does Ctrl + N or File > New Window and opens a new browser instance then the same session ID is genrated and user can update on both the windows differently and this leads to ambigous updates to DB. How can we stop user to open a new window or how can we detect that a new instance of the same session ID has been genrated twice so as to kill both the sessions with a user firiendly message.
View 1 RepliesWe have one new project to implement. Let me explain briefly about this project. This project is related showing chart to end user on the basis of different mathematical calculated formulas.
End user has authority to change these formulas on the fly and on the basis of that changed formula we need to show the chart. So this is all central idea about the project. These charts which I mentioned above are very complicated and user friendly
So can any buddy tell me which is best suitable architecture for this and how can fit her to my scenario .I knows, three tier architecture and some other are there but I want know which is the best architectures that developed above idea in right way
I have some logging that has to be done, which are some database update or inserts.
However this logging is of no importance to the user, so I only want to process the data/logs after the page is completed for the user.
As of now, if I process the data while the page is loading, I go from 1.4 to 2.0 speed (server side time processing of code), which is quite a bit comparing it is of no use to the user.
So I want this code only executed after that the page is complete.
I've been checking out Ajax, async pages etc, but the problem is it still gets executed before the page is rendered to the client, which means the client will have to wait longer then it is not being processed.
I've been checking out Threadpool.queueBackgroundWorker, however if I get it correct, this will still be executed before the page is shown to the user, as it has to complete before the prerender.
Then I thought about creating a new thread, and do the processing there, which would not have my page waiting to complete the data/logging.
However when I have 100 or 200 users loading pages at the same time, then that would mean I would be creating 200 threads on those loads, which I doubt will be good for performance. So if I want to solve this, I would have to create my own threadpool and only assign for example a max of 40 threads to it which can process the data.
All I want to get done, are some update/inserts into database after the page is rendered and shown to the user. I don't want the logging to slow down the pageload for the users obviously. I want that logging or no logging makes no difference to the pageloadtime for the user at all.
I am currently developing a solution in which the user logs in once and can work on multiple customers at the same time on my site.I've looked at all possible solutions involving sessionid having stored the customerid, to launching a new browser session so i could have multiple sessions for one users etc. I also looked at using cookieless sessions.But the all fail because it's not a simple solution and in my opinion a simple solution is most of the time a good and predictable solution.
Therefore i came up with the idea to use url rewriting(i've seen this used in other applications). When the user opens a customer, i would like to start his url as follows "~/Customers/xxxxxxx/*.aspx" where xxxxxx represents the customerid. and *.aspx represents a complete subset of pages of my site. This would allow me to use a simple technique to use multiple user sessions within a single asp.net session.
Now coming to my problem, I have never done some url rewriting, therefore my questions:
- Is this possible.
- Can i protect all the pages that need a customerid as input(come to think of it, if no customerid in the querystring, redirect to a selection screen would be sufficient).
- How do i adopt all urls used in a sitemap etc in a structured way.
Our site is expected to allow the user to do whatever they want from a number of different places. Except, that doing whatever they want really means firing off mini sequences of pages they must vist (or possibly abort from to go off to another task) before returning to their starting point. So, at any given time, the user has a list of pages they are allowed to go to, a list of pages they must go to in order to complete their task, and some end point they must eventually return to, all of which are constantly changing.
As an example, a user may choose to edit an order they placed, at which point they must step through a series of pages to edit the order. These pages to edit an order may be different based on the type of order they are editing, and they must return to whatever place they were at when they decided to start editing the order. They may also have certain options of other pages to visit during their order editing process.
I really need a good way to handle this for a large number of different scenarios, and allow it to be easily changed. Right now we are doing things like setting session variables when a user chooses an action and checking them within the page on button handlers to see what they are allowed to do or where they are allowed to go. I'd love to be able to abstract this out into something that can be easily examined in one place, or even data driven, and have some sort of navigation controller pointing them to the pages they can or must go.