I want a example of multithreading .i want to use it in a web form not on console.i am using C#.net .and how to use thread.sleep method for a particular thread.
View 5 RepliesI want to introduce a slight wait during some testing functions, to simulate a server call. Is it sane to use Thread.Sleep(int) to introduce the wait or is there a better method to have the server wait?
Note, I'll be pausing long enough for me to visually see a sufficient lag, even tho I don't expect to see such a delay in the actual app. This is for me to visualize the actual delay that could occur.
I plan on running this both in the VS2010 local debugger webserver and in IIS 7. I'm on .NET 3.5
I have a password page and when someone enters an incorrect password I want to simply foil a brute force attack by having
bool isGoodPassword = (password == expected_password);
lock (this)
{
if (!isGoodPassword)
Thread.Sleep(2000);
}
I would expect that this would allow all correct passwords without stalling, but if one user enters a bad password another successful password from a different user would also be blocked. However, the lock doesn't seem to lock across ASP.NET threads.
I want to remove checked items from checklistbox (winform control) in class file method which i am calling asynchronously using deletegate. but it showing me this error message:-
Cross-thread operation not valid: Control 'checkedListBox1' accessed from a thread other than the thread it was created on.
i have tried invoke required but again got the same error. Sample code is below:
[code]....
While passing through code in our project I came across a web method that had this code at the end of it:
thread.sleep(6000);
return true;
Now, this was done so the jQuery ajax call from the client gets delayed and the ajax animation will show for a little bit longer. This is very wrong in my eyes. There shouldn't be this kind of connection between UI and server side. If he wants the animation to take longer he can use the setTimeOut function in the client side. Here is my problem: how can I explain to the programmer why this is so wrong? Not just because the client/server thing, but why ever call thread.sleep on a website?
I maintain a ASP.NET web application that causes a user's network connection to reset for several seconds when it executes a procedure. Therefore, the page request times out on the user's end as they never receive the web application's response (the connection dies before it gets the response packet).
To resolve this situation, I was contemplating having the ASP.NET page execute an asynchronous function that incorporates a Thread.Sleep(5000); // sleep for 5 seconds before executing the connection reset This way, the browser has 5 seconds to receive the page's response before their connection resets.
I have concerns with using Thread.Sleep and asynchronous functions in ASP.NET though. I've never attempted to do it before, so I'm unsure of the potential problems it may cause. Does anyone see potential problems with starting an asynchronous thread that contains a Thread.Sleep in an ASP.NET application?
I create a NetworkStream from a TCPClient, I then call BeginRead() followed by Thread.Sleep(60000).
It seems that the BeginRead call back function will only ever occur after Thread.Sleep() has completed. Is this expected behaviour?
What I was expecting was for the call back function to be carried out on a separate thread whenever it was ready and that the Thread.Sleep() on the current thread should have no affect on when/how the call back function runs...
I'm currently creating a VT100 terminal emulator, I wanted to created a method that would allow me to make the emulator sleep until a given string is found in the screen buffer. Initially I was trying to call WaitOne() on the IAsyncResult passed back from BeginRead() if the string was missing (this was to allow more data to pass into the system so that the check could then be carried out again until it was passed), after this failed I tried Thread.Sleep instead of WaitOne() but this blocked my BeginRead call back from firing and I'm now I'm starting to think everything is running from a single thread...
How can we debbug a multi-thread program to see local variables of each thread using visual studio 2008.
View 1 RepliesI'm new to threading and have used it successfully, but limited. I can spawn a thread and have the main thread reference variables in the spawned thread, but I don't know how to allow the spawned thread to reference (and update) variables in the main thread.
Any example threading code I've seen on the web appears to be WAY more complicated than what I do, so I am unable to understand or integrate into my code.
Here is a quick example of how I use threading:
[code].....
I am reading the Asp.net security documentation on msdn.I come across these tow terms and get really confused.
# WindowsIdentity = WindowsIdentity.GetCurrent()
which returns the identity of the security context of the currently executing Win32 thread.
# Thread = Thread.CurrentPrincipal
which returns the principal of the currently executing .NET thread which rides on top of the Win32 thread.
I'm developing an ASP.NET forms webapplication using C#. I have a method which creates a new Order for a customer. It looks similar to this;
private string CreateOrder(string userName) {
// Fetch current order
Order order = FetchOrder(userName);[code]....
The problem here is, it is possible that 1 customer in two requests (threads) could cause this method to be called twice while another thread is also inside this method. This can cause two orders to be created.
How can I properly lock this method, so it can only be executed by one thread at a time per customer?
I tried;
Mutex mutex = null;
private string CreateOrder(string userName) {
if (mutex == null) { [code]....
This works, but on some occasions it hangs on WaitOne and I don't know why. Is there an error, or should I use another method to lock?
i'm trying to call a method with 3 parameters in a thread but i couldn't figure that out ..since it only accepts a non parametarized methods.
View 7 RepliesAssuming a static method like below is called from ASP.NET page,can a different thread(b) overwrite the value of s1 after the first line is executed by thread(a)?If so, can assigning parameters to local variables before manipulation solve this?
public static string TestMethod(string s1, string s2, string s3)
{
s1 = s2 + s3;
....
...
return s1;
}
Is there are a simple way to recreate such thread safety related issues?
Im creating a messaging system which is a bit like the inbox feature of this forum. So far I have built the page with a datalist (as this is the advice i was given). I just want to know how I should create the tables within the database so that the thread of messages is seen by the right people when they login and view messages. Which is basically the 2 people messaging each other. The system is gonna have user sign in functionality as well.
View 12 RepliesI am modifying a forum application (asp.net 3.5). This app uses web.sitemap as the following:
[code]...
Now, we want improve it: When a user clicks on any thread in thie Topic page, we want the siteMapPath to be displayed as the following:
check this code about threading ..
i am getting different o/p every time. just i want to start the thread ,suspend that thread and resume that thread .
namespace ThreadTest
{
class Program
{
static void Main(string[] args)
{
Thread th = new Thread(new ThreadStart(new Program().Call));
th.Start();
Console.WriteLine("STARTED");
th.Suspend();
Console.WriteLine("SUSPENDED");
th.Resume();
Console.WriteLine("RESUMED");
Console.ReadLine();
}
public void Call()
{
for (int i = 1; i < 200; i++)
{
Console.WriteLine(i.ToString());
}
}
}
I am trying to run this log routine in a separate thread in order to improve page load performance but I am getting an error in the line bellow: "object not set to an instance of a variable".
line error: strTempBrowser = System.Web.HttpContext.Current.Request.ServerVariables["HTTP_USER_AGENT"].ToString();
I am suspecting that Request.ServerVariables are not available during the time that the thread executes. Is there a workaround?
Page Base Class
//STATISTICS
SiteStatisticsLite sStat = new SiteStatisticsLite();
Thread oThread = new Thread(new ThreadStart(sStat.AddLog));
oThread.Start(); // Don't wait to finish, just let stat logging to occurr after page loads
public class SiteStatisticsLite
{
//SiteStatisticsLite sStat = new SiteStatisticsLite();
I am developing an asp.net application which provide a UI for user to submit some kind of job.
Behind the scene, i created a thread to sleep around certain mintues and then process the submmitted job. I would like to ask this is right way to create some worker threads to process the jobs? any risk in threading? any other alternative?
currently, i am facing the timeout of asp.net session. For example, the period of sleeping is 25 mins, the thread will not be processed because the asp.net session is timeout in 20 mins.
Yeah some people would say "Are you crazy using winforms controls inside asp forms"... and I think they are right. But I would say.. "I'm not the only one!!, take a look" [URL] So. Doing some kind of stuff like the previous link. I did the following:
[Code]....
Now. the DocumentCompleted event is not fired (neither ProgressChanged) and I've tried the next: Add the library MsHtml.dll to my project and place the file into my lib folder... I did it... No changes.Try to handle the state of the WebBrowser.ReadyState... I did it... No changes (Actually after receive the ebBrowserReadyState.Complete I tried to print the document with
[Code]....
I've got a page that I'm using as an e-mail template. I'd like to spin off a new thread, take the rendered page, and put it into an e-mail. Is this possible? If so, how? I haven't had luck so far.
View 3 RepliesI have an application that initially display 4 grid views at page load. This process takes 50-60 seconds and I would like to change the process to display the web page, show message like "Data being loaded, please wait..." and then spin off a thread that fills the various grid view. When this is done I would programatically like to do a post back to show the result. Not sure if this is possible? I tried something like this:
[Code]....
Im creating a messaging system abit like the inbox feature of facebook and even this website (its gonna be created as a asp.net website). Now the messages ive been told should go to a database and then from there be displayed on a page. Im gonna be creating this system because its a project for university. Its not going to be published online or anything, just a simple demo in front of suoervisor n examiner. Im gonna simply create a database within the application to hold all the data.Now i need to have user login feature capability so the right messages are displayed to the right users. I wants the messages to be as a "thread". Any idea how this can be done in asp.net? im using visual studio 2008 .net framework 3.5.
View 1 RepliesHow to use progressBar with thread in windowsApplication..
I have a for loop in c# layer when loop start progressBar with start and when loop finish progressBar is full ???
I need an explanation regarding some advice I got on this site. I'm doing a newsletter sending app, and I have my mail sent in a seperate thread so the process doesn't slow down the whole web site. A couple of people advised me to set the threads IsBackground property to true. I did this, but was also courious about what this does, so I googled a bit.
As it turns out, setting the IsBackground property to true indicates that "it's okay if the process shuts down while this thread is still running.". Or as microsoft puts it "Any remaining background threads are stopped and do not complete." I don't know if I got this the wrong way but, wouldn't it be better to leave the IsBackground property to false, so that the spawned thread can complete its work regarding the main thread?
I want to execute a process, but after the process is done i would like to execute a query so i know this process is done.The process called ffmpeg is quite big so i start it and wait til its done with this coding:
ffmpeg.Start(); // start !