.net - HttpContext Is Not Available - Calling Webservice Asynchronously
Feb 8, 2011
I currently have a web application project that also includes web services within the same project. I currently have a requirement to call the web service asynchronously. Since, I haven't added the web service as a web reference within the same project, I tried to call the web service method using delegates and I see an exception "HttpContext is not available. This class can only be used in the context of an ASP.NET request" when I tried to access the Application property in my web service method call.
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Jan 7, 2011
I am trying to call this webservice asynchrounously in vb.net. So on the aspx side i added this property async="true". Now on the vb.net code side i have this function inside my webservice that i am calling.So -
dim as as webservice.webstring
as.functionasync(param1, param2)
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Feb 6, 2011
I am new to programming especially jQuery and webservices. I want to pass the values to the to database via the webservice. [code]....
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Nov 17, 2011
I am new to VB.Net. I am working on a project where I have to Start another applcation from web service.
I am able to start the new application(Eq.Notepad) from form of my project. But If I try to start the new applciation from web service then The application is running in processes. I am able to see the application in Task manager processes. I am not able to see the application in front end. I have tried ProcessStart, PSExecute , bat files running and their all parameters but nothing happened.
I am sure I am missing something but I dont know what exactly it is.
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Sep 24, 2010
I'm trying to setup a connection to a webservice from VB.NET I'm totally clueless on how to perform this. I receive an overview of what their Soap can do and i also received a securitykey. I'm however not sure how to call this webservice using the securitykey in VB.NET. bit further using the layout of the service underneath.This is the soap layout:
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Nov 18, 2010
for a unit test I am trying to add a value to the HttpApplicationState object, which is the Application property of the HttpContext.Current class. I try with the following code
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Jan 20, 2011
I have some code that works fine when I need to delete some image files from a directory on my web server:
Dim ImageURL As String = dsImages.Tables(0).Rows(iImgRow).Item("ImageURL")
Dim physicalName = Server.MapPath(ImageURL)
oUpload.DeleteFileFromServer(physicalName, iAdid, iImgID)
[code].....
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Jul 6, 2009
Is there a way to look through the cache for all objects in the cache? I'm dynamically creating objects and I need to periodically go through the list to purge out objects I'm no longer using.
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Jul 27, 2011
I have an asp.net project that's compiled on a server. On that same server I have a windows service that's running methods referenced from the asp.net .dll. Everything works fine except for when the httpcontext.current object needs to be accessed. I'm fairly certain that the cause of the .current being null is that it's referencing the shared library without an actual instance of the site running. In a previous version of the service I was able to find a workaround in asp.net by not using the context, however that is now a last resort as much of the architecture of the site has changed. Is there anyway to create an instance of the site and simulate a current httpcontext for the purposes of the service?
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Jan 5, 2012
Im having a problem understanding if accessing httpcontext inside a shared function, without passing in the httpcontext as a parameter is thread safe?
Are the 2 functions in the util class equally thread safe?
Class foo
Sub main()
Dim qs1 = util.getQS(HttpContext.Current)
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Jun 19, 2012
I was working on a scenario where I have to add header to the Response Header.
I added a Response Header like this:- HttpContext.Current.Response.AddHeader("key1", "value1")
After some functional flow I required to add value to same "key1": HttpContext.Current.Reponse.AddHeader("key1, "value2")
thus value in Response Headers look like this:- key1 : value1, value2
I want to avoid the value2 addition to the same keyword key1.
I tried:-
If HttpContext.Current.Response.Headers("key1") Then
HttpContext.Current.Reponse.AddHeader("key1, "value2")
EndIf
But I got the error: This operation requires IIS integrated pipeline mode at HttpContext.Current.Response.Headers("key1")
I have IIS6 running. This [URL] says that it doestn't works if its not IIS7
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Apr 10, 2011
2003I've implemented Forms Authentication on one particular subfolder on one of my sites. My code works perfectly on my development machine, but there is a slight problem on the live server.If you browse to the admin subfolder, if you are not authenticated, you will be redirected to the login page. The Master Page footer also contains a link to the login page; when the user logs in, that link is supposed to change to a link to the admin page:
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
Dim link As HtmlAnchor = FindControlIterative(Me, "Login")
If HttpContext.Current.Request.LogonUserIdentity.IsAuthenticated Then
[code]....
This works fine on my dev PC, but on the live server, IsAuthenticated() returns False, and thus the Login link is not replaced by the Admin link. However, if browse to the admin subfolder, I can access the content fine; there is no redirection to the login page.
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Feb 14, 2011
I have this code List<string> myList = new List<string>();
myList.AddRange(new MyClass1().Load());
myList.AddRange(new MyClass2().Load());
myList.AddRange(new MyClass3().Load());
myList.DoSomethingWithValues();
What's the best way of running an arbitrary number of Load() methods asynchronously and then ensuring DoSomethingWithValues() runs when all asynchronous threads have completed (of course without incrementing a variable every time a callback happens and waiting for == 3)
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Jul 23, 2010
I'm trying to make an asynchronous upload operation but I got this error message:
Error occurred, info=An exception occurred during a WebClient request`.
Here's the upload function:
Private Sub UploadFile()
Dim uploads As HttpFileCollection
uploads = HttpContext.Current.Request.Files
[code]....
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Jun 22, 2012
I have a listbox of items that need to be processed, and I would like to process them asynchronously on a separate thread. (Never done this before).So I created a Delegate, a Callback, called the method that does the work on the listbox items.
I am getting an exception "System.InvalidOperationException": Cross-thread operation not valid: Control 'ListBoxBlah' accessed from a thread other than the thread it was created on.
Doing the asynchronous operation for individual items doesn't make sense to me because I am only doing it to perhaps perform a large number of operations (the listbox may have 20000 items) in the background while allowing the user to do other stuff.
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Feb 9, 2011
I've a vb.net web application where I'm referring to another vb.net dll by adding the reference of the dll and creating the object but after the call it waits for dll to finish operation and return a value before moving forward, is there a way I can do the same job asynchronously.
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Jun 16, 2009
In VB .NET, when you call RaiseEvent X(), is the function that handles the event X processed asynchronously or synchronously. I was under the impression that RaiseEvent and the processing of the event were Synchronous unless created explictly on another thread. I've been told otherwise though.
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Jun 23, 2010
How do i file download asynchronously in WPF vb.net?
Is there a timer control in WPF?
I am using vs2010 Pro
I need to write an app that downloads a file, uncompresses it, scroll through it and update sql table. Also print labels and invoices.
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Jun 7, 2011
I am trying to build a code to get the website asynchronously using webclient.download stringasync..I want to pass the data thus retrieved from dowloadstringcompleted to another function.[code]My problem is that I am not being able to pass on the values as StartDownload gets completed, while data is still being retrieved.
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Oct 23, 2010
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Now i need to do a few hundred/thousand requests all at the same time or atleast over a short period. I am assuning i need to do this asynchronously. I have looked all over the net and tested various ways to communicate asynchronously and am pretty stumped. None of the examples out there seem to explain how i receive the xml return as a string ("which i will write to file or db")
Does anyone have any working code to do such a process?
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Feb 16, 2010
im making a transport agent for exchange and am getting hung up on how to call a method asyncronously. Im doing this based on an msdn article but like usual they didnt provide the part of the code i need to figure out.the article is in C# but i converted it to vb in my project. [URL]I know I need to setup a delegate for the method and then invoke that delegate, but im not 100% on how to implement this.
Imports Microsoft.Exchange.Data.Transport.Routing
Imports Microsoft.Exchange.Data.Transport
Namespace TestTransportAgent
[code]....
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May 17, 2010
[VS 2010 Beta with .Net Framework 3.5]I've written a C# component to asynchronously monitor a socket and raise events when data is received. I set the VB form to show message boxes when the event is raised. What I've noticed is that when the component raises the event synchronously, the message box blocks the component code and locks the form until the user closes the message. When it's raised asynchronously, it neither blocks the code, nor locks the form.
What I want is a way to raise an event in such a way that it does not block the code, but is called on the same thread as the form (so that it locks the form until the user selects an option.)
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Aug 31, 2011
I have working code to read an RSS feed that uses:
Dim doc As New XmlDocument
doc.Load("http://...")
Dim channel As XmlElement = doc("rss")("channel")
Dim items As XmlNodeList = channel.GetElementsByTagName("item")
Unfortunately the doc.Load call causes the rest of the program to become unresponsive until it finishes.What's the best way to perform the load asynchronously and have a callback function to process the data?Edit: Here's the code I've tried using WebClient - the Load method is still lagging:
Private Sub checkResults()
'request rss feed
Dim w As New System.Net.WebClient
[code]....
The rssReadCallback method is executed fairly quickly after calling checkResults, but then the UI freezes during the Load method.
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Feb 22, 2012
I have a flash video player embedded in a page which has javascript calls for it's controls, specifically calling playStarted() when the play button is pressed. I want to capture this event asynchronously to record when people are actually playing the video versus visiting the page, but I'm not really sure how to do this.
I was thinking the "hack" of a way would be to create a javascript function called playStarted() that would post the video ID to a separate ASP.NET page that would then record it to SQL (where I store my data on page visits and where I want to store my data on video plays.)
But ideally there is a better way to do this where I can register the javascript to the script manager so it can trigger a public sub asynchronously when it's called
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Jun 9, 2011
I need to call a stored proc from a .NET web page which takes around 15 min to process. We do not want user not to be able to browse the website in the meanwhile. Is calling it asynchronously the way to go or are there any other recommended ways?
make an asynchronous stored proc call?
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Apr 6, 2010
I have a program I would like to release, has 2 programs within it.1. The main program. 2. A resource utility.To release it, i'm going to package them both up using a 3rd party setup maker.Now, the question is this.I noticed in the snippets...theres 2 options.Update application synchronously or asynchronously.
First, whats the difference between the 2?Also, could I utilize that so it'll update from the clickonce, so I dont have to keep repackaging it?Also, I want all updates to be mandatory, vs optional like in clickonce default updates..where it gave the user the option to skip.Reasoning is, for cracks, hacks, etc, if it is modified, and i notice cracks, etc. it'll update and replace any cracks, etc. No "skip the update, so the hack/crack continues to work".
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Jun 27, 2012
I want to upload a large file of tracking numbers and process them into our ordering system.
I used to use Server.ScriptTimeout = 3000
It worked until we upgraded our servers and now it crashes.
I'm Getting This webpage is not available The connection to www.YourSite.com was interrupted.
I could see the .csv file has been uploaded, but many tracking numbers do not get processed.
I'm thinking of maybe switching to a asynchronous update. But I cannot find any good source for it.
If you have any good ideas, please let me know.
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Jan 15, 2012
I've been reading up on asynchronous function / web pages for ASP.NET 3.5 (we're not using v4 yet) but the ones I've seen all focus on performing a background task but then still coming back to finish up and send the response, after the task is complete.
What I want to do is simply kick off the background task (in this case a call to a web service) but then return a response to the browser immediately - ie. without waiting for the asynchronous task to complete. I don't even need to know if it succeeds or not.What is the best way to do that? I can't seem to find examples of kicking off what you might call an "orphan" background task in ASP.NET.
I thought of doing it via a javascript Ajax call on the page I show to the user, but the information passed to the web service is sensitive, so that's out of the question. But that kind of illustrates what I want to do.
[ed] Another idea: Is there an event in the ASP.NET model I can use which occurs after the response has been sent to the browser and the connection closed? ie. So more processing can occur without the user waiting for it?
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Mar 2, 2011
I have a function in a module that returns a datatable.I need to call that function asynchronously and get the results in the Main thread (Main Form) in vb.net.
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Dec 15, 2010
All my paint calls are under OnPaint event of the form. my game is getting laggy so i was wondering if theres a way to paint images asynchronously using a background worker.
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