Ajax - Long Process And Sending Updates To Browser
Jan 30, 2010
I've asked this before but I was hoping for another answer and perhaps some code samples because I've been having a difficult time with this. I have an asp.net page. The user hits the "Run" button and I have code IN AN ASSEMBLY, not in the APP_CODE folder that is called and runs a long process that moves product info from a file into the database. While the user waits, I would like them to see status updates like what product the import process in on and status info. I'm assuming I'd break off into another thread and use Ajax but I have no idea how to do this.
I've been having a difficult time with this. I have an asp.net page. The user hits the "Run" button and I have code IN AN ASSEMBLY, not in the APP_CODE folder that is called and runs a long process that moves product info from a file into the database. While the user waits, I would like them to see status updates like what product the import process in on and status info. I'm assuming I'd break off into another thread and use Ajax but I have no idea how to do this.
I have an asp.net page that calls a dll that will start a long process that updates product information. As the process is running, I want to provide the user with constant updates on which product that process is on and the status of the products. I've been having trouble getting this to work. I add information to a log text file and I was thinking that I'd redirect to a new page and have that page use Javascript to read from the text file every few seconds. My question is has anyone else tried this and does it work fairly well?
I know that similar questions have been asked all over the place, but I'm having trouble finding one that relates directly to what I'm after.
I have a website where a user uploads a data file, then that file is transformed and imported into SQL. The file could be up to 50mb in size, and some times this process can take 30 minutes or sometimes even longer.
I realise I need to palm off the actual work to another process, and poll that process on the web page. I'm wondering what the best approach would be though? Being a web developer by trade, I'm finding all this new Windows Service stuff a bit confusing, and I just wanted somewhere to start.
So:
Can I do / should I being doing this with a windows service? if so, how?
Should I use WCF? If this runs under IIS, will I have problems with aspnet_wp.exe recycling and timing out my process?
clarifications
The data is imported into sql, there's no file distribution taking place.
If there is a failure, it absolutely MUST be reported to the user. The web page will poll every, lets say, 5 seconds, from the time the async task begins, to get the 'status' of the import. Once it's finished another response will tell the page to stop polling for status updates.
queries on final decision
ok, so as I thought, it seems that a windows service is the best idea. So as to HOW to get it to work, it seems the 'put the file there and wait for the service to pick it up' idea is the generally accepted way, is there a way I can start a process run by the service, without it having to constantly be checking a database table / folder? As I said earlier, I don't have any experience with Windows Services - I wondered if I put a public method in the service, can I call it somehow?
In an asp.net web form, I keep getting a connection reset error message. The page is doing a some long running processing (about 2-5 minutes).
I have no problem when the web request comes from the same machine as the web server. But when the request originates across the network, I get a connection reset error about 1:30 or 2 minutes into waiting for a response.
I have set the in web.config for this application and put the application it's own application pool.
What else can I try?
Edit
The purpose of this page is to accept input from the user, calculate something, and send the result back to them. The long running calculation isn't something I can offload until a later time.
Want to display staus of long process. when user click on button calling some function which will return the percentage of work done .I want to display that persentage in some where in the page.How can i do it?
When my Application face a long-time process, i.e fetch a query (SELECT a, b, c FROM d)This query needs 10 seconds to be completed in the MSSQL Management Studio, but when the ASP.NET application try to fetch it, it refuse to return any response to any other requests made on that Server.
I am hosting my Application on VPS Server with good specifications, and I am giving this example the (SELECT a, b, c FROM d) just to tell you the issue, it can be any process, maybe processing a movie, or even fetching some data through external API that is experiencing some slow-down,or whatever.
Note:- i don't want to use updateprogress etc. control of ajax
on button click, long task(e.g thread) runs in my webpage for about 4-5 minutes.I want to show status to user either by a processing image through javascript(image must be shown in a certain part of page other part of page will remain intact) or an exact status of process if possible. i have tried a lot but all in vein.
Situation:I have an ASP .NET application that will search through docs using Lucene. I want to run the initial indexing (the index will be incremental after the initial run so there wont be need to index the whole directory again in future). Currently, I have about 5GB of docs (45000files).Problem: My application times out before completing the process. I have altered the TimeOut like this:HttpContext.Current.Server.ScriptTimeout = 200000;but it still does not complete the process.
On my current project I have to accept 2 Excel spreadsheets that will be uploaded by clients, process them and create a download package based on this information. This process includes extracting data from the sheets, updating our databases and building several PDF files for the download package. This takes between 15 seconds to 2 minutes to complete, depending on the complexity of the request. Naturally, I want to show some kind of processing indicator rather than just leaving the user hanging while the page loads.
Here's the problem: How to show this processing indicator.
I have to do a full postback to upload the files so this eliminates several nice AJAX indicator methods (sponsoring users rejected the AJAX toolkit async file upload, saying it was confusing to them). If I process on any of the page events during the postback, the page doesn't load until the lengthy process is completed so the browser/site looks 'hung'.
Basically, I need some ideas on how to display a 'building your download' graphic while the lengthy process is working that will also work with a full postback.
Wondering if there is a performance difference between letting a long running process hang in asp.net vs running the process via a windows service. I have done this once before and the windows service was much quicker and didnt bog down my system, whereas the asp.net request seemed to wreak havoc.
I'm running a single page (default.aspx) web site in Visual Studio 2010. I have a few other projects in the solution, but they're all taken out of the build queue at the moment. I'm using Visual Studio Development Server as the web server (I haven't tried IIS yet). I'm using the HTML5 Boilerplate from [URL] I'm testing in Chrome and IE8
Problem
Visual Studio 2010 is outputting "Debug" information to the Output window every time I refresh my browser. Whilst this isn't a problem in itself, it seems to be extremely slow in doing so... it takes around 4 seconds to show the page in full from initial refresh.
I've noticed that the "Script Documents" folder appears in my solution view, and some files (notably JS files) seem to take a while to show up. I've tried removing all the JS and CSS file references from my page, but it still does it.
So, to troubleshoot I've created an index.aspx page with no content apart from the generic ASP.Net template code, set this as the start page, but it still takes just as long to load up as the other page.
As a last resort, I've created a new project and tried it with no changes to the default page - still the same, takes a few seconds to finish loading in either browser.
The strange thing is that this happens even when I stop debugging in Visual Studio and browse directly to the URL on the ASP.NET Development server.
I need to perform an operation such as extracting the data for past one year from DB and doing some manipulations and finally displaying the excel graphs for the extracted data. The extraction of data takes almost 6-7 hrs. What i require is that user enters the required data (date and some other details )through an asp.net page and submits it and then closes the browser. Now a process should get started which will extract all data and create the graphs and finally send an email to the particular user.
i need to develop a tool which will take a long of time while processing, lets say copying data with size 1 GB from one database to another,
i can develope a webform for that issue but i have a problem which is when the user close the browser the process will terminate!
what i need is when the user click on "copy" button (regarding to my previous scenario) the process continue even the user close the browser, and will not end untill the all data copied successfully to the destination place.
should i use windows service with my webform? or webservice ?
I have created a new VS2008 ASP.Net Web service project, with the default name WebService1. If I right click on the Service1.asmx file and select 'View in Browser' what are the processes that go on to make this happen? I am asking because I have a situation where when I run this from a visual studio project started in our development shell (which sets up a common build environment) I cannot get the web service to show up in the browser.
C:WINDOWSMicrosoft.NETFrameworkv2.0.50727Temporary ASP.NET Files ootc43ddc22268ae91bhashhash.web
I was wondering if there is any difference in performance (or any other important factor) between a file sent to the browser from our server by this method :
For i = 1 To fileSize chunk If Not Response.IsClientConnected Then Exit For Response.BinaryWrite stream.Read(chunk) Response.Flush Next VS
the old plain file access method that the IIS comes with.
We are working on a file manager handler for security reasons and would like to know what is the performance hit.
I am trying to solve a problem that involves creating a very large XML string and stream that to browser. Right now i am using stringbuilder class. Here is the sample code
here i am using only just one property.
[code]....
total length of the final string will be 120MB or so.
With this code i am getting out of memory errors intermittently. To resolve this issue ..i am planning to create a HTTP handler for streaming XML output to browser.
I have seen several websites that show you a real time update of what's going on in the database. An example could be. A stock ticker website that shows stock prices in real time Showing data like "What other users are searching for currently.." I'd assume this would involve some kind of polling mechanism that queries the database every few seconds and renders it on a web page. But the thought scares me when I think about it from the performance standpoint.
In an application I am working on, I need to display the real time status of an operation that a user has submitted. Users wait for the process to be completed. As and when an operation is completed, the status is updated by another process (could be a windows service). Should I query the database every second to get the updated status?
I have a hidden field which is used to count the number of times "Load Grid" button is clicked. Load Grid button and the grid view are in update panel as shown below.
[Code]....
Code behind: public partial class ajaxGridSort : System.Web.UI.Page { public string sortOrder { get [code].... Each time user clicks on load grid or try to sort in the grid, I am loosing the hidden field values. Can you please help me understand why am I loosing hidden field data on AJAX postback and please provide the solution for this issue?
