How To Use Threading To Call A Repetitive Process

Jan 22, 2011

In my website, I need to do a repetitive task which should not affect the main activity and performance of the website.

So I think I need to use threading. I am new into threading in .Net.

How to use threading is .NET?

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<CssFiles>

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I have a table for labels in SQL server, in this table i hold all the text for all the labels i use in my website. The reason i am doing this is because i creating a bilingual site, which will display two languages on one page at the same time. The other language being arabic.

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What Is Threading And How It Is Done

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what is threading and how it is done?

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Sep 7, 2010

I've written a aspx.net(C#) page that after the user has done what they do on the page they hit a Submit button. The Submit button

1) takes the work the users was producing on the page and writes it to a file.
2) attempts to execute a batch file.

The call to the batch file is executed via:

protected void Execute123EDI()
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proc.Close();
}
catch(Exception ex)
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lblDebug.Text = lblDebug.Text + ex.Message + "<br/>";
}

If I watch the processes tab in Task Manager on the web server I see "cmd.exe" under the context of 'administrator' but it just hangs. For test purposes c:SendV80s.bat: copy c: oot.ini c:zzz.txt

If I logon onto the webserver's console and execute SendV80s.bat it works and exits without issue. But when I execute the same batch file via the Submit button it gets stuck executing in Task Manager/Process. I believe this has something to do with the fact that cmd is not running in a full environment/desktop context. I just noticed this on the actual console of the webserver (not in my RDP console but console 0 instead)

A pop-up box stating: CMD.exe Application error The application failed to initialize properly (0xc0000142). Click OK to terminate the application. And when I click on the OK button my ASPX page's WaitForExit is satisfied and the continues processing normally.

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MVC :: MemoryCache Threading?

Mar 13, 2010

MSDN says that MemoryCache's instance members are not thread safe. (http://msdn.microsoft.com/en-us/library/system.runtime.caching.memorycache(VS.100).aspx)

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Use Threading With DAL Operations?

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I want to use my functions in DAL asynchronously by executing them in a separate thread. The issue in all this is suppose I have a function DAL.GetProducts() which returns a DataTable. If I execute this function in a separate thread, when it is completed how do I get the returned DataTable from this thread and bind it to my UI?

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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

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I keep receiving an exception with the message "Logon failure: unknown user name or bad password". Im absolutelly sure that i'm submiting my correct username/pwd

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Apr 3, 2010

I've developed a popup email .aspx used on our intranet based web app that is auto generated with .pdf's attached. I'm developing with VS 2008 ASP.Net 3.5 C# and System.Net.Mail.MailMessage. I can create and send the email with no issues. The problem is with any attempt to open or delete the attachments I get the above error. The .pdf's a copied with the following code:

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I'm trying to do some multi-threading in my asp.net web site. But I'm having trouble getting my child thread to interact with my main thread. In the following very simple example I would expect that, 3 seconds after clicking the button, the "Hello World" text would be displayed on my page and on my label. Instead, after a few seconds, I get the following error in a pop-up box "WebDev.WebServer20.exe has stopped working - Windows is checking for a solution to the problem.". I am running Visual Web Developer 2010 Express. If you know why I'm getting this error and if you know how to fix the problem respond.

ASPX file is as follows:

[Code]....

CS file is as follows:

[Code]....

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I'm trying to get threading to work in ASP.NET but for some reason it keeps crashing my local server, and simply does not work at all when uploaded online. Here's the code:

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[code]...

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In my ASP.NET website, I am having a function which has to be automatically performed once every 2-3 mins on its own, i.e. without user intervention. This function contains database access.

Can I use threading to perform this process in background?

If Yes, How can I use that?

Edit

Also I am not looking for a solution which includes windows service because I am using shared hosting. So I dont have all the rights to access the host computer.

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The code:

[Code]....

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Threading Hangs Other Page Loading?

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I have a Main page containing links to five other pages. each page has a button which does some job using Thread. Problem is when i open a window from main page and click the button, The Process starts but if now i want to open another page from main window it doesn't load untill that previous page loads fully(when thread ends). I am not using any session variable on my page.

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Dear ladies and sirs.

I have a .NET infra code running both within the IIS worker process and within a desktop client app. How can the .NET code determine whether it is running within an IIS worker process?

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[Code]....

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2.Another function textFileReplace() which is used to replace the text from "Reply from 172.29.116.3: bytes=32 time=1ms TTL=255" to 172.29.116.3.

This process will continue every 30 minutes..

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Nov 23, 2010

I m getting the error System.Threading.ThreadAbortException while exporting datatable to CSV. But export to CSV is completed sucessfully.Here is my Code:

Dim dt As DataTable

Dim sb As New StringBuilder

dt = objsqlds.Tables(0)

[code]...

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Nov 1, 2010

I've got an asp.net application, it's running on DotNetNuke, under load we get the occasional out of memory exception. I've got a dump loaded it into windbg. the end of !dumpheap -stat is

1192a588 88684 2128416 AutoMapper.MappingEngine
79333594 9482 2266348 System.Byte[]
134b0034 88695 2838240 System.EventHandler`1[[AutoMapper.TypeMapCreatedEventArgs, AutoMapper]]
13d8703c 88684 4611568 System.Collections.Generic.Dictionary`2[[Castle.DynamicProxy.Generators.CacheKey, AutoMapper],[System.Type, mscorlib]]
13d86dc8 88684 4611568 Castle.DynamicProxy.ModuleScope
13d865bc 88684 4611568 System.Collections.Generic.Dictionary`2[[AutoMapper.Internal.TypePair, AutoMapper],[AutoMapper.IObjectMapper, AutoMapper]]
79327434 88703 4612556 System.Collections.Generic.Dictionary`2[[System.String, mscorlib],[System.Int32, mscorlib]]
6c38e4e4 88684 5675776 System.Threading.ReaderWriterLockSlim
79330b24 87736 6458012 System.String
000d9c88 129 24186884 Free
793042f4 221202 101117016 System.Object[]
6c38e4a0 22703104 544874496 System.Threading.ReaderWriterCount

I can't find much information on the System.Threading.ReaderWriterCount, as it seems to be the problem. What is the likely cause? Or failing that what's the best next step to work that out? Based on the pointer from the given answer I had a look at ReaderWriterLockSlim. I wasn't using it directly, but I saw that it had 88684 instances, digging deeper I saw quite a few classes with that number of instances, pointing to AutoMapper.MappingEngine. This should be a singleton, so I've had a look at where it's being created. I suspect that it's the DI container and have made some changes around that to see if it helps

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What I then need to do is run a number of checks to ensure the user can access that data, and also find out if another user has a lock (recorded in the DB) on that object.

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My implementation for this would be using a delegate(s) and calling BeginInvoke, however I'm worried the overhead of threading this may lead to no speed increases.

My research has indicated it will use the ThreadPool, so there shouldn't be too much overhead, but I'd like to know if anyone has implemented this kind of solution to a similar scenario on a high traffic site and seen good resutls from it?

The reason I'm looking to do this is we are reengineering our application from the ground up, and need to make sure we are building something that will scale considerably.

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