Web Forms :: Best Practice For Handling Multiple Requests At The Same Time?
Jul 8, 2010
we have this web service that sends JSON code to an iPhone application.
Each time the app makes a request, the web serice accesses the database, grabs corresponding xml data, transforms it to JSON code and then sends it back to the app.
the xml data gets updated approximately every minute, you can assimiliate this process with a sport app of which you can watch live game commentaries.
Now the iPhone app is going to implement a refresh button which a user can proactivly hit it against the service to fetch the latest data.
So we need to implement something that is capable of handling multiple requests that could occur at the same time or in a very short period of time.
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Oct 19, 2010
I have a form which inserts data in DB on Submit button click but the problem is when client click the button multiple times its sends multiple create requests means multiple button click events for the same time of same data, which must not be.
I tried to disable the button when client click the Submit button first time but after this it does not call server click event handler or not fire the server click event once it got disabled.
How to handle this multiple click problem..
I used the following code to disable the button
[code]....
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Apr 19, 2010
What will happen if multiple events appear in same time ? Which will be first executed ?? Is there any some kind of "events order" ?
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Mar 13, 2011
I have a RESTful webservice. This webservice builds some information (which can take upwards of a couple seconds) and caches the contents.
This works well; however, suppose that many of the same requests come in at about the same time. In our current scenario, each request will build the content before caching. This is obviously not desired as it uses CPU time that could be better served elsewhere. What I would like to do is to suspend/block requests to the same url/cachekey until the content has been built and cached, at which time those other requests will be unblocked and simply fetch the content from cache.
I am not sure the best way. The following are options I have thought about:
Use string.Intern on that cache key and lock. Problem is that this could cause a deadlock if that string is used elsewhere. Use a ConcurrentDictionary and WaitHandle objects to allow other request to lookup in the dictionary if a request is being processed and then "wait" for the request to finish. This would at least give me a timeout capability but I am concerned with the performance of creating many wait handles.
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Jun 3, 2010
I devide my website on 3 layers :
DAL(Data Access) - simple extract data from DB using LINQ
BLL(Business Logic) -
cache data and in try/catch block call function from DAL and throw it to UI :
try
{
}
catch (Exception ex)
{
//Log error
throw ex
}
UI (User Interface) - simple working without handling any exception,
So if error occured in BLL i will be redirected to Error.aspx page with message that something wrong.
how and where handle exceptions, or may be exists common patter where handle and how to inform user about errors ? Can anybody share bes practice.
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Aug 23, 2010
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Dec 9, 2010
Imagine a website where individual clients can see each-other's presence - like a social network or a chatroom.
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Apr 12, 2010
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Jan 18, 2010
We are developing products that will be used in the following way:
Various shared libraries which may be used by multiple products. I anticipate these libraries will mostly need to access string resources that contain error messages/exceptions. Various end-user based applications, designed to run as standalone apps on a PC. They will be required to support multiple languages upon deployment/installation.
Various web-sites which may be required to support multiple languages either at deployment time or possibly at runtime (i.e. minimal or zero downtime). Potentially the site might need to support multiple languages at the same time if being accessed globally.
We may be required to allow customers access to our language files for editing themselves. We would not wish to allow them access to our source code (other than the resource files/dlls) in order to achieve this. We might need to incorporate a facility to log exceptions in our native language (English in this case) and display them in the translated language. This will us debug our customers solutions in the field.
I am already aware of products like RCWinTrans and handling multiple languages in VC++/MFC applications. However, the requirements we are faced with here are more extensive and thus require us to make a few up front decisions that could be difficult to change long term, so ideally we want to make the best choice now. Based on my own knowledge, I have a few questions although I may be missing some tricks with .net that will be happily received. Here are my questions:
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Nov 18, 2010
I am want to develop a quiz site using MVC 2. A single page will display only one question. The examinee will select or type the answer and press Next button to proceed.
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Jan 28, 2010
I run a site with decent traffic (~100,000 page views per day) and sporadically the site has been brought to its knees due to SQL Server timeout errors.When I run SQL Profiler, I see a command getting called hundreds of times a second like this:
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Feb 11, 2011
So I have two tables in my database, Contacts and Addresses:
Contacts : ContactID | AddressID | FirstName | LastName
Addresses: AddressID | Address1 | Address2 | City | State | Zipcode
I have a page where you can add a contact. It contains all the information for a contact and an address for a contact. Here's my code for when you submit the form:
[code]...
Now my main concern is that the address is added successfully, but then an error occurs when I try to save the contact, leaving the address in the database with no contact.
What's the best practice here for rolling back any changes if an error occurs?
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Jul 9, 2010
I have a DataTable which holds information on truck routes. When the user click on a route it display another table with details about the stop along that route. When they click a stop it shows what items were picked up at that stop. Three separate pages with 3 distinct DataTables. Currently I am storing them in the session. Normally, I would use the view state since the data only needs to live on that page. The reason I use the session is because each page is part of a Master pagelayout. There is an export button in the master page which gets the data in the session and exports it to an excel file. The issue is that when the user goes to the item level detail and uses a quick navigation link back to the route information the data for route is not reloaded into the session, just the page. If the user clicks export it will export the data set from the item level detail even though it is not displayed on the page
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Mar 17, 2011
I am using asp.net and I would like to test a few hundreds concurrent requests to the same page, and get a result. I don't need it via browser. Just a tool that sends requests and prints the result Is there such tool?
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Jan 3, 2011
I'm building a web application that has a particular model representing some events. Users need to be able to add N number of people to a given event. Choosing people is handled by a partial view.
I'm trying to build a menu that displays when users click "add a person" to the event. Because the event hasn't been filled out completely yet, there is nothing in the database to persist between requests.
I also have validation logic on the event page.
My proposed solution is to add the form to search or add for people on the event form itself and have a submit button that sends the values that have been added back to the server, where I can store them in ViewData or Session.
Unfortunately, doing this flags the validation.
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Oct 26, 2010
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1) We update the Control as follow:
2) We update the HomeController.cs file to handle the Logon Button Post event as follow:
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>>> To me that I come from the WebForms world, it seems like even if the event fired was the Register button (therefore under the AccountController domain), there is a kind of hidden OnInit event fired for any control on that view, in this case the Logon event. I'm sure this is NOT the case but the real question is... if we are allowed to have only one Controller x view, how can we put together controls that come from different "controller domains" and display them inside a single view?
Could I develop an eCommerce site using MVC that has the home page displaying different controls like [Most Purchased Product, Product of the Month, Special Promotions, Messages Inbox, Company Events ... and each control has it's own button to click and do something (so a proper POST request)] on the home page, unless I only have ONE single Controller which i'm not even sure if it will work or if it would make sense ....since MVC is all about separation of responsibilities.
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Aug 11, 2010
Is it possible to send multiple HTTP requests asynchronously to an ASP.NET web site or any other web server using .NET ? And, then. collect responses from those requests as they come using .NET asynchronous paradigm ? Is it possible ? Or would there still be limit of max 2 HTTP connections from .NET using HTTP ?
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Apr 8, 2010
Ok I hope I can describe this clearly. This is all demo code nothing in production.Right now I have a stored procedure that is
[Code]....
This will return only one row as ID is uniquethen I have a procedure that gets all the colors that are available for this model number and i use that data in a drop down list, it is like this
[Code]....
this can return multiple rows with different colors.Right now i am opening a connection getting the product data, consuming that to properties of a class, then to get the data from the Colors I open another connection run the procedure with the model parameter being the model returned from the first sproc and bind that to my ddl.I want to do this in one connection and just get two result sets back. So how do I set the parameter of the second procedure to be the model from the first?
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Mar 16, 2010
I have a small project I am working on using web developer express, and I am trying to get windows authentication to work with my intranet website project. This website is only to be accessed inside my LAN and not from the internet at all, so I figured windows authentication would be best.What happens when I turn it on (and I've tested this from multiple browsers: IE8, Firefox, Chrome, Safari) is that the website asks the user to log in (via pop up textbox). Not only does it request the user to log in (which I don't think it should, since the login is based on windows authentication and I am on a windows machine already logged into the internal domain) but it requests the user to login multiple times, sometimes I get asked to log in and type in the same username/password combination 12 different times. It seems to me that the asp page is requesting permission to view each individual element and requires authentication to load one object (like an image or text box).
I am severely annoyed. :( I just wanted authentication to work smoothly without any login requests, or at the mostone request.
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Apr 4, 2011
I have a typical scenario that I'm struggling with from a performance standpoint. The user selects a value from a dropdown and clicks a button. A stored procedure takes that value as an input parameter, executes, and returns the results to a grid. For just one of the values ('All'), the query runs for roughly 2.5 minutes. For the rest of the values the query runs less than 1ms.
Obviously, having the user wait for 2.5 minutes just isn't going to fly. So, what are some typical strategies to handle this? Some of my own thoughts:New table that stores the information for the 'All' value and is generated nightlyCache the data on the caching server
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Feb 1, 2011
I'm fairly new working with Javascript. I'm working on an issue where I have a GridView with multiple Checkboxes and Radiobuttons. A user can check multiple checkboxes and if a radiobutton is selected, a checkbox has to be selected. This scenario is working fine, presently with existing asp.net code. But, I want to automate it using Javascript, so that I could avoid a postback.
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Mar 17, 2011
I've got a WCF web service that runs fine at the moment but there is talk about using it very heavily soon. As part of it's normal process it writes a file out, then reads it back in again (don't ask why, I know it's stupid). I'm concerned that if we start hitting it with lots of requests then the following might happen.
1. Request 1 writes the file out.
2. Request 2 comes in and overwrites the file.
3. Request 1 reads the file back in but this is now the wrong file.
My understanding is that the requests would naturally queue up so that request 2 wouldn't start until request 1 had finished, but I'm not totally sure.
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Mar 8, 2011
I'm creating a page that makes multiple AJAX form posts without a page refresh.
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Jan 27, 2011
I'm using HttpContext.Current.Items to make a Per-Request Cache Store. I'm hitting to many Cache entries over different http requests.
It seems that HttpContext.Current.Items is reused across multiple http requests. Is it normal?
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Mar 29, 2011
I currently have a project that I seem to have ran into an issue regarding Roles and thought I would get some opinions on how to best handle the problem. The system will require editable, flexible roles that control not only the access of specific areas, but also the use of system functions (Adding Users, Editing Users, Viewing Reports etc.)The system currently allows users to have multiple roles, each of those roles has explicitly defined areas of access/actions, for example:
Role A can access areas 1,2,3 and can Add Users.
Role B can access areas 1,5,7 and can Modify Users.
Role C can access areas 4,6 and only View Users.
so a User could be in Roles A and C, and thus access : 1,2,3,4 and 6, and could Add and View Users.My first solution was to create a dictionary that would store all of the possible areas of access/access options into a Dictionary like so:
Dictionary<string,bool>
then when it is instantiated it pulls all of the properties from the database and then iterates through the roles to determine if they are accessible.All of that currently works just fine - however the project is quite Javascript/jQuery intensive so many of these options are called by client-side functions. I am trying to avoid having to wrap all of these client side functions with:
<%if(AccessDictionary[key])
//Enable or Disable Action
<%}%>
I am wondering about the following things: After a user logs in, what is the best way to store this Dictionary? Statically? In the Session?What would be the best method of storage such that the Dictionary will be easily accessed in the View? (As I currently see no way around wrapping my client-side functions)!
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