My application is showing lots of thread wait events in the GetScriptReferencesInternal method of ScriptObjectBuilder. I am running a load test with 150 concurrent sessions and in 10 minutes I see 1000 thread block events. Each event stalls the execution of the thread for an average of 6 seconds.
View 2 RepliesI 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...
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]....
I am encountering issues in the navigation defined in a master page which are being blocked by validators pages that inherit from the master. How can I disable these validators so that they do not prevent my button actions in the master page?I am using AJAX controls in child pages.
View 2 RepliesI have an issue with master page.i have used modalpopup control in one of the contentpage of "Masterpage.master".but the modalpopup is not blocking whole page instead it's blocking only the pace covered by contentplaceholder in the masterpage.
[Code]....
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 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 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 RepliesThe question is, is it possible that requests for the same session are executed from multiple threads? Are methods in ASP.NET reentrant? Especially we are using AJAX which means that asychronous requests are taking place.
Would this mean to place locks around operations on objects placed inside the session?I know that locks are essential when handling static and application wide variables, but the question is is the same true for session objects?
I want to update my UI with work-progress within a thread. So i am planing to call webmethod every 2 seconds to get the current progress status. This is my code but I can not complete it.
[Code].....
I have an ASPX page with several update panels. They all have their UpdateMode="Conditional".
Some panels are refreshed when the user clicks a button and other are refreshed regularly, with a timer.
The panel refreshed with a timer launches a database query and many validations on the data. Then display the result in a panel when errors have been found.
That all works fine except when the validation has to delete files on the disk. (.txt, .jpg, etc it depends). In that case, after the validation is made, I am always kicked out of my website because of the error (Thread was being aborted). So I loose all my session variables which means I am not logged off.
Anybody had that kind of problem ? Is it normal that deleting files AND directories on the server make me loose my session? Is there a way to prevent that ?
AjaxControlToolkit.ToolKitScriptManager.OnInit() throws thread abort exception for every aspx page. I have an asp.net 2.0 Ajax application, where I have set the following properties of ToolScriptManager on my pages.
<ajaxToolkit:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server" EnableScriptGlobalization="true"
EnableScriptLocalization="true" CombineScripts="true" EnablePageMethods="true">
<Scripts>
I have this configuration on all the aspx pages in my application. When I checked the .NET CLR exception Performance counter I figured out a large number of exceptions, mainly one exception per page load is occuring. On running windbg I was noticed that
AjaxControlToolkit.ToolKitScriptManager.OnInit() has the following code block which is getting executed. The OutputCombinedScriptFile() returns true. But since I am setting my controls on DesignTime still designmode is set to false for toolkitscriptmanager.
if (!DesignMode && (null != Context) && OutputCombinedScriptFile(Context))
{
// This was a combined script request that was satisfied; end all processing now
Page.Response.End();
}
I am not sure if this is a reported bug or even a bug with ajax, but this is causing havoc in my load test results as I have around 3 hundred thousand HTTP requests to be handled per day out of which 80% are aspx page requests resulting in a large number of threadafbortexceptions, thus affecting the performance.
I need a way to block users from their IP if necessary. What's the best way to approach this? Can I use Request.ServerVariables["REMOTE_ADDR"] and store the ip address as a string in the DB?
View 3 RepliesI have built an online CMS that is forms authenticated. The CMS allows administrators to upload files to the website. These files are stored outside of the Forms Authenticated section of the site so that they can be accessed from another site I have built. This other site is also forms authenticated, so users must log in and then they can access the files on the CMS site. site1.com: CMS for administrators only. Site stores all the files. site2.com: Access site.
My second website (The access site), is basically an empty shell that is filled with all of its content through the CMS using an SQL database and then displayed on the page. This works fine as only authenticated users have access to the interface used to view and download the files. My problem was, even though there is no public interface to find the files, someone could surely type [URL] and the video would be available to them. I dont really know what to do here, is there any way that people could be blocked from retrieving the files like this?
I have an ASP.NET MVC application that use the default ASP.NET Membership Provider. My customer asked to implement a feature that prevent users to log in (for example for users that resign and leave the company). I cannot use the IsApproved flag of the Membership table because that field is used to confirm user egistration. Is there any built in functionality for doing this? What are your experiences in scenarios like this?
View 1 RepliesI have a client who wants me to block his site from certain countries. Each month I add all the new IP address ranges for these countries into a sql database. If the user has a blocked IP address, the site directs them to a phoney 504 error page. This way it doesn't appear that the site is being blocked, but rather is just having difficulites. Thats the way we want it.
It works fine however, there are some users (5%) who get a 500 error. No rhyme or reason. It works across all browsers and operating systems. I have no way of finding out why from my hosting service. I can't dupliate it. I have the following code that runs at Page_Init
[Code]....
I want to increase the security of my website, does creating http module that block certain ip address will increase security?
Since IP Address can be manipulated if I'm not mistaken, I'm not sure that creating HTTP Module will help.
We have a page that makes a request to a 3'rd party web service. When under heavy load this response time extends significantly, however the 3'rd party reports back that there times for processing remains constant. There timings show that from the time they receive a request to the time they send it back is always around 1.5-2.0 seconds. Now we are experiencing wait times of over 20 seconds. My understanding of ASP.NET is that each request will run on a IIS thread pool thread and make the request to the 3'rd party service return and process. So I don't really understand what could be blocking on our end. Is there something I am missing?? Is there a threshold limit beyond IIS that is blocking?
If I am missing something a physical book recommendation that covers this subject would also be a very welcome addition to any answer.
Whenever I use TransmitFile to send a file, the sirte becomes blocked to the user until the file completes. IOW, the user cannot navigate the site.If the user cancels the transfer, it still blocks until the site either times out OR finishes sending the data. I can't tell which, but I know if for example I cancel a 30MB file immediately after starting the download, it takes longer to recover than a 10 MB file.Here is the relevant code:
Response.ContentType = "application/octet-stream";
Response.AppendHeader("Content-Disposition", contdisp);
Response.AddHeader("Content-Length", new FileInfo(fullfilename).Length.ToString());
Response.TransmitFile(fullfilename);
Response.Flush();
I was wondering whether HttpPostedFile.SaveAs function in ASP.NET C# is a blocking call.
View 1 RepliesI'm generating a file on the server which takes some time. For this, I have a hidden iframe which I then set the .src attribute to an aspx file i.e iframe.src = "/downloadFile.aspx"While this is taking place, I'd like to have a call to a web service return the progress. To do this, I thought I could use window.setInterval or window.setTimeout but Javascript seems to be blocked as soon as I set the iframe src attribute.Does anyone know how to get around this or perhaps try a different approach?I have also tried handlers, but the request never gets to the server so I'm assuming is a browser/javascript issue.
//Function that gets the file
function GetFile() {
setTimeout(GetProgress, 1000);
var iframe = document.createElement("iframe");
[code]...
i m using two grid in both gird i have a text box control on which i apply some java script funtion. my broblem is that when i press a tab key then its block my textbox. it means i m not able to press any key in that box even mouse click is not working.
my both grid in a same update panal but when i set focus out of that update panal and back to my text box they are start working properly.
i m applying a Web method on that text box also which call by javascript.3
I have a bookingwith credit card page in my application and users will enter their crdit card details inside the textboxes. but after they enter them and post it the browser cache the data and after that in the same textbox, it can be autocomplated.
View 1 Replies