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]...
This may seem like a really simple question, but can I use the System.Threading namespace in ASP.NET web forms? I have a web page which uses HTTP GET/POST to gather page customisations (title, subtitle, etc.) from the user and numerical input which is passed to a ASMX web service. Currently they work sequentially, the customisation first followed by numerical processing. So can I use threading to do this?
View 3 RepliesI'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
I have just started to look at the new "System.Threading.Tasks" goodness in .Net 4.0, and would like to know if there is any build in support for limiting the number of concurrent tasks that run at once, or if this should be manually handled.
E.G: If I need to call a calculation method 100 times, is there a way to set up 100 Tasks, but have only 5 execute simultaneously? The answer may just be to create 5 tasks, call Task.WaitAny, and create a new Task as each previous one finishes. I just want to make sure I am not missing a trick if there is a better way to do this.
[code]....
Hi,
I need some explanations regarding the above exception.
I understood that if you place a response.redirect inside a try catch block, u will get the exception and the aspnet will handle the exception silently without the user knowing. But the thing is that right now i am having a hard time thinking of a reason
why the error will occur after some changes has been made and the codes with the response.redirect has not been touched.
Regards,
Poh Wei Xiang
I have a web app that makes a call to a webservice, and it is causing a ThreadAbortException. Why is this? This does not happen when calling the webservice in a windows form application.
View 1 RepliesI am facing a problem wherein, whenever I am trying to export a large recordset to excel (over 50k records) I am getting the System.OutOfMemoryException. I want to know a couple of things :
1. How do I handle this exception as try - catch does not seem to work?
2. I am pasting sample code. I just want to know if there is a better way of doing this :
[code]....
What's the correct way of ignoring ThreadAbortException when logging exceptions?
Is it safe to just catch it in an empty catch block to make it disappear?
I know all about this exception, read the msdn article here [URL] but I do not know how to handle this when my boss does not want me to throw in false for the Response.End.
Here's what I have:
else
{
try
{
VoidlOrder(transactionID);
}
[Code]....
We are using below code to export gridview data to excel. It is working fine when export 2 or 3 months data with more than 120,000 rows but we can try to export data for more than 12 months which almost contain 480,000 rows so it generates error
"System is out of memory exception" ....
Referencing my Earlier Question, regarding downloading a file from a server and handling exceptions properly. I am positive that I had this solved, then in classic programming fashion, returned days later to frustratingly find it broken
Updated code:
private static void GoGetIt(HttpContext context)
{
var directoryInfoOfWhereTheDirectoryFullOfFilesShouldBe = new FileInfo(......); [code]....
This was working fine, and returning the zip, otherwise if the file didn't exist returning 404. Then on the client side I could handle this:
public bool Download()
{
try
{
using (var client = new WebClient()) [code]....
But the problem now is two things.
1) I get System.Threading.ThreadAbortException: Thread was being aborted in the server side try-catch block. Usually this was just a file not found exception. I have no idea what or why that new exception is throwing?
2) Now that a different exception is throwing on the server side instead of the file not found, it would seem I can't use this set up for the application, because back on client side, any exception is assumed to be filenotfound.]
I am using threading in my c# code to upload multiple files. The code is as shown below:
[Code]....
When I run this code, the ASP.Net Development Server gets stopped without throwing any exceptions. What might be the reason?
Object objFilePath = (Object)Element;
I am using crystal reports in my web application which came along with visual studio 2008.My problem here is export and print buttons in crviewer are working fine in my local system but when i hosted the app in server actual problem came into picture.Export and print buttons are not working.
View 1 Replieswhat is threading and how it is done?
Is there any difference between threading in web applications and threading in winforms applications
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)
Does that mean every time I call Get() or Add() in a action method I have to wrap it with a lock?
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?
View 3 RepliesI have a web form that contains a GridView, which impliments Search in Grid with a TextBox and Button control in the footer. This works as I have it now. I have also implimented a Export to Excel function. The Export to Excel works by itself if the Search in Grid function is not included in the footer.The Export to Excel function errors when trying to render the Grid for the export. Is there a better way to incorporate both functions and accomplish the same thing? Am I missing something simple?
[Code]...
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]....
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:
protected void testThread()
{
for (int i = 0; i < 10; i++)
[code]...
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.
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?
I'm a completly noob in Multi-Threading c# web pages... and i'm taking the first steps... I have one web page that create one new thread for each image to load. Each thread only read the external image and save it to local server. I have for example pages that have 25 images... that page loads but it launchs 25 thread (1 for each image).
The code:
[Code]....
I assumed that when a thread finish it's job it will automaticaly be killed, is it that way ?? I'm asking because, when i try this code on the server, after some navegation and multiple images loaded the IIS goes down and the page return "Service Unavailable" error :( To solved it i need to restart the IIS Application Pool... For those that have experience in multi-threading web pages how can i kill this threads ? Aren't they suposed to be killed when their job is finish ? ? Do you know a good tutorial or article for begginers ???
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.
View 2 RepliesI have a web app where a user will visit a page with a QueryString parameter passing the ID of the object I should retrieve.
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.
Currently these searches are all performed sequentially, however I'm thinking the best option might be to use delegates to be able to fire off the three or four searches required at once then use the results as they are returned.
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.
I have a .NET 4.0 console application that does a lot of reads from SQL Server 2008 using the OleDbDataAdapter object.I tried to improve performance by spreading the processing logic across four threads using Visual Studio 2010's Task Parallel Library. Sadly the multi-threaded version is three times slower than the original. Using VS2010's performance tools, I found thousands of thread contentions caused by the method OleDbDataAdapter.Fill() which populates a DataSet.This is puzzling as there are no static classes or variables involved that would result in the OleDbDataAdapter being shared by my threads. Also, four simultaneous connections just can't cause a hold up at the database level, right? The default connection pool size should be much larger than this.
View 1 Replies
