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 Replies
what 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'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]...
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 RepliesIn 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 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]...
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
I 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 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 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 RepliesI have one button on my page. On click of this I need to run four methods parallely in four saperate thead and need to show the progress bar for each method. Also need to update the label controls form those threaded methods.
Also I need to user Update panel of AJAX control tool kit to avoid post back to user.
I have used the read pool for that. When I remove the update panel the code works fine and update four labels but when I put the update panel it is not updating the labels.
how can we debug multi threading and watch local variables of each thread.
Thread windows does not show variable values.
How can we log user operations for a asp.net application. Further what is the approach for saving the log data ?
View 3 RepliesI have a table in a DB in which I need to perform the following operations:
1. Order the table using index A.
2. Traverse the table and do some calculations for every row.
3. Order the table using index B.
4. Traverse the table and do some calculations for every row.
5. Order the table using index C.
6. Traverse the table and do some calculations for every row.
As you can see, what I need is to process such a table several times depending upon a different index for every process. If I use a DataReader I can only traverse it one way and one time, I cannot apply another index and start from the beginning once again. What strategy should I use to achieve my goal? Is a DataTable a good choice?
I'm reading the stream from a FileUpload control, reading in chunks of n bytes and writing the array in a loop until I reach the stream's end.Now the reason I do this is because I need to check several things while the upload is still going on (rather than doing a Save(); which does the whole thing in one go). Here's the problem: when doing this from the local machine, I can see the file just fine as it's uploading and its size increases (had to add a Sleep(); clause in the loop to actually get to see the file being written).
However, when I upload the file from a remote machine, I don't get to see it until the the file has completed uploading. Also, I've added another call to write the progress to a text file as the progress is going on, and I get the same thing. Local: the file updates as the upload goes on, remote: the token file only appears after the upload's done (which is somewhat useless since I need it while the upload's still happening).
Is there some sort of security setting in (or ASP.net) that maybe saves files in a temporary location for remote machines as opposed to the local machine and then moves them to the specified destination? I would liken this with ASP.net displaying error messages when browsing from the local machine (even on the public hostname) as opposed to the generic compilation error page/generic exception page that is shown when browsing from a remote machine (and customErrors are not off)
I recently purchased a new domain for the sole purpose of hosting all the static content on a separate server and delegate CPU intensive operation like thumbnail creation on a different pool. Now I would like to do some operations on images uploaded to that remote server : creating thumbnails or updating the image if we need to. Should I download the images to my server, modify them there and then upload them back to the remote server or should I try to create web-services to manipulate the images?One of my solution was to provide an interface to upload and manipulate the images in the new domain, by leaving the old domain when it comes time to work on images, but I find it kind of awkward.I would like to keep the new domain cookie free. How would that affect my ability to restrict any random user to use the web-services if I decide to go that way?
View 1 RepliesI find myself needing to preform the same actions on both HtmlControls and WebControls. I am a firm believer in DRY and find the fact that there is only the Control class to use if I want to consolidate the functions on both types. The problem that I have with using Control is that there certain properties that both HtmlControl and WebControl expose that Control does not. In the current case, the Attributes property is the problem. how to avoid the duplication of code in this type of instance?
View 2 RepliesI have a page which is accessible only from Monday to Friday. If i try to open it on Saturday or Sunday it shouldn't.I have a column in my DB naming WorkingDays and iam storing Bitwise value
Monday=1,Tuesday=2,Wednesday=4,Thursday=8....
So the value in my DB is 31 which is equal to Monday to Friday.If i open the page on saturday how should i check?
How should i convert todays day to bitwise value and how should i compare with the DB value.
I have one asp.net application, in which i am using "Calling WCF Service Operations in AJAX" method. I finished my work without the service hosting in IIS. I got the correct solution. But now, i have another requirement in which i am using the WCF service which is hosted on local host iis. But in clicking the button i got one javascript error like object expected. I don't know why this happened?
My code is shown below.
<fieldset style="width: 804px" align="center">
<legend>Consuming WCF Service using Client-Side AJAX</legend>
<div align="left" style="text-align: center">
<form id="form1" runat="server">
[Code]....
Does anyone have a tricky tip to simplify my complex String Operations? I receive a string sequenze from database which i have to manipulate on RowDataBound of an GridView, put the String into several controls. The String looks like this:Here goes a introduction string with easy formating options such as {blue}blue text{/blue}
{CONTROL}{ParamsForControl|ParamsForControl}Text for Control 1{/CONTROL}
{CONTROL}{ParamsForControl|ParamsForControl}Text for Control 2{/CONTROL}
{CONTROL}{ParamsForControl|ParamsForControl}Text for Control 3{/CONTROL}
Some Text at the end.My first try was easy because I haven't had an introducing and a ending text, so I split the String at "{CONTROL}" extract the Parameters and replaced "{/CONTROL}" with nothing, works fine...But if i now split at "{CONTROL}" how to handle the text in front of and behind them... I do a lot of string.IndexOf and String.LastIndexOf operations but I hope there is an easier way...Result should be:
Introduction Text = Label
Control = UserControl
Control = UserControl
