Multithreading Program Is Not Working And Asp.net
Feb 11, 2011My multithreading program is not working, the dropdownlists will either be blank or only one will load.
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IDE :: Program Not Working As Expected?
May 18, 2010I am running Windows 7 pro and using Visual Basic 2010 express.I have written a small program to switch on a USB relay which is controled by a serial port.I have debuged the program and it appears to work correctly. I have published the program and if I start it from thr run menu / desktop shortcut / or through explorer it works as expected.
However I have tried to run it by the Task Scheduler and then it fails to run as expected. I have a small section of code that checks to see if the serial port is present if not I have used messagebox.show to ask for the relay to be pluged in. In every case other than when running through the Task Scheduler the messagebox works with the Task schedulerit doesn't show the messagebox and the program hangs I have included the code I have used.
Dim retry As Boolean = False
Dim data() As Byte = {255, 1, 1}
Do Until retry
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Simple Program Not Working?
Nov 26, 2011I'm just starting to learn vb.. trying to figure out why this is not working.
Public Class Form1
Dim final As Double
Dim grade1 As Double
Dim grade2 As Double
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Create A Program Working In Background?
Nov 17, 2011I want to create a program working in background that:I open program and he is invisible (not appear on desktop and in taskbar).How I can do this ?
View 6 RepliesVS 2005 Program 'has Stopped Working' On Win 7?
Jun 9, 2011Program written and tested on XP x86 and then attempted to run it on windows 7 x86, but it just gives me the error '***** has stopped working'.I have checked it is being built for the correct platform (x86) and Win 7 has .Net framework 4 installed so i'm at a loss as to why it won't run. Some programs i've written work fine, some just crash.[code]
View 3 RepliesVS 2008 PHP File Working With Program?
Dec 21, 2009I have a php file that performs a certain function, and I would like to know how I make the program do that function, and write the results in a textbox.
View 3 RepliesVS 2008 Working Within A Host Program
May 10, 2010I am working on an addin/plugin for CAD software called Solidworks. I use it to batch process files (print, save, etc). One thing I'd like to add is a form that contains a stop button to stop the loop. The problem is that even if I use a background worker like I normally would for a standalone application, it still locks up when Solidworks is processing files. That's just normal operation for the program, the UI freezes when doing a cpu intensive operation such as loading or saving files, regardless of how I write my plugin. So my limited attempts at threading to get a form that won't freeze have been unsuccessful so far.
View 1 RepliesWorking On A Program That Is Using Access As Its Datasource?
Oct 31, 2009I am working on a program that is using Access as its datasource. I would like to be able to have the user "approve" a bid and then the database copy that row into the Approved Bids table from the Submit for Approval Table and then delete the entry from the Submit Table.
View 1 RepliesWorking On Tab Controls In Notepad Like Program?
Jan 3, 2010I am working on a notepad like program and I am adding tabs I've been able to successfully make buttons to add and close tabs but now all my other codes are messed up (as I was using a richtextbox before).
View 21 RepliesWay To Generate Random Numbers For A Program Working On
Feb 22, 2010I am a newbie programmer and I need a way to generate random numbers for a program I am working on. It just needs to be something simple that generates a number and allows me to assign it to a variable. I would like it to be something small say 1-10 would be good and an explanation of the syntax would be helpful
View 9 RepliesWorking On A Program That Takes Input From A Textbox?
Aug 31, 2011I've been working on a program that takes input from a textbox, removes the punctuation, puts the words into an array (using the split method), and compares the array against a reversed copy of itself to determine if it is a word palindrome or not. I understand the logic, but I'm getting kind of caught up as far as what code to us. This is what I have so far, but no matter what I enter into the text box, nothing happens. I'm completely lost as to what I'm doing wrong.
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How To Get Shortcut Keys Working When Program In System Tray
Dec 14, 2009I have this code for my shortcut keys
Private Sub Form1_KeyDown(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles Me.KeyDown
If e.Shift = True And e.KeyCode = Keys.F3 Then
'Do something
End If
But I also have a button to send my program to the System tray like so:
NotifyIcon1.Visible = True
Me.Visible = False
How can I get my shortcut key to work while my program is in the system tray?
It doesn't work while its a notify icon
Process Checking Not Working When Program Is Minimized To Tray
Sep 21, 2010I wrote code for checking whether a particular process (Outlook.exe, in my case) is running or not. It is working fine when the Outlook window is open or minimized. But, when the Outlook is minimized to tray (which on the right side of taskbar), my code is not identifying the process.Could anyone please suggest me a way to get the process of Outlook (or any other program) that is minimized to tray?
View 2 RepliesProgram's Full Name And Driver's License Textboxes Not Working?
Nov 15, 2011I am new to VB. I use Visual Studio 2010. I got most of my rental program to work, but I am having trouble with the easy part. The First Name and Last Name are supposed to combine to the FullName. I know I have to use the assigning textbox text to the the variables. I haven't had much luck to to that.
'Project: Very Very Snowboards
'Date: 10/22/2011
'Programmer: X
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Update Changes From Program To An Access Database File Not Working?
Oct 15, 2009Private Sub BooksBindingNavigatorSaveItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BooksBindingNavigatorSaveItem.Click
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VS 2008 Way To Make Program Working With Different Display Resolutions?
Apr 23, 2009I have a program developed on a machine with high display resolution. Now when I try to run it on a computer with low resolution, the screen got cut off. OK, is there a way to make the program working with different display resolutions?
View 2 RepliesWrite A Program That Disables The Keyboard Completely From Working?
Sep 2, 2009i need the code in VB.NET on shutting down a windows computer
Also how can i write a program that disables the keyboard completely from working
IDE :: VB 2008 Express: Program Runs On PC But Stops Working When Trying To Run .exe On Another Computer?
Jun 3, 2011And here I am with a new problem in my program When I debug it everything works fine (the buttons, progressbars, pinger, spambot, When I compile it and run the Executable file, it works too.When I run the Executable file on another computer (tried on 4 different ones) the program stops working and
I get this error:
{$ exception. "Failed to create the form For more information, see Exception.InnerException error: File or assembly ." Microsoft.VisualBasic.PowerPacks, Version = 9.0.0.0, Culture = neutral, PublicKeyToken = b03f5f7f11d50a3a "or one of its dependencies not found. The system can not find the file specified .."} System.Exception {System.InvalidOperationException}
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Make A REAL Key Generator - Program Code To Building A Working Keygen ?
Jun 24, 2009I've been trying to create a working keygen for three months and I havn't figured it out. I first inserted two buttons and named one "Generate" and the other "Exit" and then I put in a textbox. After that I put in the code and debugged it every time I pressed the Generate button a 0 just popped up in the textbox. my code is below.
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
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Get A VB2008 Multi Thread Application Working That Connects To A Local Server Program Using Sockets?
Sep 30, 2009I'm trying to get a VB2008 multi thread application working that connects to a local server program using sockets. Server requests for this particular system can be more quickly handled by a number of connections, so I've written some code to run any number of data request threads that I choose. The problem that I'm having is that the data returned from the server is getting mixed up and is often returned to a different thread/socket than the one that requested it. Other than that, it seems to work okay. If I use just one thread, then the system works as it should. Pls. see incuded code, which is heavily edited to remove all the other fruit salad. Is there any way to set up the sockets so that data returned to the socket/thread that requested it?
Module StaticDeclarations
Public WithEvents g_SD As New SocketDataClass(New MainThread.MTCallback(AddressOf MainThread.MTResultCallbackSub))
Public WithEvents g_MT As New MainThread(New SocketDataClass.SDCallback(AddressOf SocketDataClass.SDThreadResultCallbackSub))
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How To Do Multithreading
Jan 18, 2010What is multithreading and how do i do it in vb.net?
View 2 RepliesAsp.net - Use Of Multithreading In Web Apps
Dec 17, 2011I am using an Application server for calling Oracle Reports and I have a URL to call the report. When the report is called the server converts it into PDF but when report contains large data it takes a lot of time to load. I want to do in asp.net that when I call the report url it opens the PDF file and copies it into the root of my web folder. The next time when I call the URL it opens the PDF file and creates a new PDF on backend for next call. I have made this function to download file
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C# - MultiThreading And Deadlock?
Mar 28, 2009In which situations we can do the multithreading and deadlock concepts. can give some examples
View 4 RepliesMultithreading A For Loop?
Feb 27, 2011Basically I am making a proxy testing program. A user can supply a list of proxies to test. What i want to be able to do is have them be able to specify how many threads they want to run. Then have the program go through the list testing each one using the amount of threads supplied. Really not sure even where to start on this. Threadpooling?
View 3 RepliesMultithreading And Commons?
Dec 21, 2011What does common data or data that's in a common, look and is treated by multithreading? I'm quite aware that acess to such data would have to be synchronized, but beyond that is it acessible?
"MODERN PROGRAMMING is deficient in elementary ways BECAUSE of problems INTRODUCED by MODERN PROGRAMMING." Me
Multithreading In A Class
Apr 13, 2009I have a class with a background worker in it that does some tasks on a separate thread. I want to fire some events from the background worker thread to the 'main thread' of the class, so that when using this class your not obliged to go make invoke calls for every event handler your using.I'm at a loss of how to do this though. When having a similar problem in a form of usercontrol I always use Me.Invoke, but this method is not present in a class inheriting system.object.
View 1 RepliesMultithreading With A Timer?
Mar 1, 2011I have a screen that checks for alerts every 30 seconds by looking up outstanding issues from a database.When there is an alert, an audio file is played depending on the alert.It takes 1-2 seconds to grab this audio file which caused an issue with global screen freezing, so I added multithreading where it plays the sound file. This seemed to work fine.However I am new to multithreading and am not sure if I'm working with it efficiently..I have simply declared the sound-playing function as a thread at the top:[code]I am unsure if starting and aborting the thread is the right way to do it. However if I suspend or make the thread sleep I would have to determine whether it has been run before.
View 18 RepliesMultithreading With Databases?
Aug 22, 2010I have read many articles on multithreading over the past few days and so far I'm fairly comfortable with how it works. I am now working on my actual application, and have come across a few design issues that I'm hoping somebody has experience with.The basic premise of the application is simple. A database filled with files names and a "converted" field that has a 1 or a 2 in it (1 for unconverted, 2 for converted). The application loops through every record where "converted" = 1, retrieve the file and convert it.
My single threaded application works fine, except its far too slow. Due to the huge amount of rows in the database (4 million+) and the time constraints on the project, I have decided to run as many threads as the hardware can allow to cut down on the timings.So, the dilemma is accessing database records and which threads should grab which record and how.
Multithreading With Same Procedures?
Nov 23, 2011I have a function in my program that adjust sales for multiple days. Sometimes it needs to adjust up to 3 months and the tasks takes a while so I decided to split up the work between multiple threads. The way I have it working is say I need to adjust 3 months. I have the first thread adjust sales for the 1st month, the second thread adjust sales for the 2nd month and finally a third thread that will adjust sales for the 3rd month. Since all three threads are performing the same tasks except for different date range they use the same procedures. Within those procedures I make a call to the database to extract the sales for the given month. At some point it seems like the threads start to use the same SQL Data Objects because I am receiving the below error."There is already an open DataReader associated with this Command which must be closed first."Below is the first procedure that is ran by each thread up to the line where it errors out.
Private Sub Process_Adjustments(ByRef objAdjustBillCodeThreadParameters As clsAdjustBillCodeThreadParameters)
Dim cmd As SqlClient.SqlCommand
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So all three threads call this subroutine and the first thread does the data fill with no issues and then sometimes even the second thread does the data fill with no issue but then the third thread crashes and produces the above error. It seems as though the threads are sharing the same SQL Objects when all objects are local to the sub and I always thought each thread had it's own memory to work with. So I thought each thread would call the sub create it's own objects in memory, but that does not seem like what it's doing. I have other multithreading processes in my application that work perfectly fine, this is the first time I am attempting to multithread in this manner where I am using the same procedure within multiple threads.
Just thought of something that I might be doing wrong. The subroutine in question is in the same class where the threads are created. Should the subroutine be in it's own class, and therefore each instantiation of that class?
Use Multithreading With VB 2005?
Nov 13, 2009I try to use Multithreading with VB 2005. I added a Listbox to main form and i tried to fill ListBox with 2 threads. When i executed code it told me that this is unsafety operation becasuse of ListBox is created with Main(Form1) form.
Is there anybody who has such simple multithreading example with Mutex or such lock mechanism?