I;m really new to VB.NET and desktop application development. Simplified this is what is happening in my application: [code]The last line will throw an Exception saying that img1 cannot be moved because it is in use. So my application is still using it, but how to make my application stop locking the file? There is nothing keeping a refrence to it (as far as I see)
View 2 RepliesI develop an application through two multi project solutions.There is one solution for the data layer stuff and another one for the front end stuff.All the dlls are referenced in a startup project and have copy local = true. So the build output from the GUI solution and the dlls referenced from the data layer solution should be copied to this startup project's bin folder. This seemed to work without issue for some time, but after changing source control, after a rebuild of the data layer solution, I clean the GUI solution and get the following output: [code] I have researched this problem and it seems microsoft are aware of a problem, logged under MSB3061... but no solutions have been posted by MS. Several users have suggested stopping the indexing service from indexing bin and obj folders (I've done this). I've also ensured that none of the bin/obj folders are under source control. I downloaded FileMon from sysinternals and it says that devenv (GUI) has the file locks.
View 13 RepliesWhen using File.Copy to copy a file, can another application access the same file? We have a situation that an application writes to a text file once a while, and I am going to write a program to copy the text file periodically to another folder. My concern is what if during File.Copy, the file is locked and the other application cannot write to it.If File.Copy locks a file, any idea on what I can use to copy the file?
View 1 RepliesI have a complex application running on IIS7 and Vista. It usually works ok but sometimes during longer processing threads/pages it seems to block(appear like there is no more wp's), but it blocks only on a single browser. Eg I have firefox open and go to a page which sleeps for 10 mins, then I hit other normal pages and these pages also seem to block. But in internet explorer the pages run really fast. This only happens for 2 minutes at then they are back to normal, the original page is still loading in the background but now those other pages are working ok.
Note, I have changed, network.http.max-connections, network.http.max-connections-per-server, network.http.max-persistent-connections-per-proxy, network.http.max-persistent-connections-per-server all to 100. Maybe I have missed some?
I am opening a bunch of excel files to read them line by line into sql at the moment - but ran into a small problem. When using something like this[code]...
if I then open the file manually, it will error the code. I put in some error protection, a try...catch block and if it errored, it will keep trying to open the file. If it opens the file, that means I closed it manually and the program will pick up from where it left off.
This isn't very successful, as other errors won't be trapped right, and the program will crash if I don't catch the errors (they cause an infinite error looping).
Is there a way to have the app/file open somehow, so if I open any other excel file, it won't open, or it will open but not error out in the program cause it's now physically open?
Put permanent Cap Locks on a Form?
View 18 RepliesPossible Duplicate: How can I programmatically determine if my workstation is locked? Checking for workstation lock/unlock change with c#
I would like to determine when a Windows (XP, or 7) machine is locked, and unlocked.I would like to create a timesheet activity logging app, and pre-filling times in, with lunch, breaks taken, etc, would be very useful.Is it possible to pick up an event that fires when the Windows Operating System is locked and unlocked ?
i understand that web service creates its own sessions so thats no problem to multi-thread. but i am writing my results into the database and files. how to do i do my concurrency control for writing into file and database here, can i do it on my calling app which is a console app or i will have to do it in my web service. i am not returning anything to the calling app.
View 7 RepliesI'm developing a new program to add rows to a spreadsheet using VB.NET on a Windows 7 64 bit computer with Office 2010 installed. I have done this many times in the past with slightly different setups with no problems. This program locks on: xlWorkBook = xlApp.Workbooks.Open(FullFileName)After several minutes HRESULT=0x80131c08.ErrorCode=0x0 appears
I have to idea why it locks. The XLS does exist in the folder.
[Code]...
I develop windows applications in VB.NET using Visual Studio 2008. Recently I reloaded my pc and moved from XP to Windows 7 64 bit. Now when I am debugging, when I should get a runtime error, the executable instead locks up when it should bring up the code with the line that it crashed on like you'd expect in debug.
This doesn't happen all the time, only when I get a runtime error in a separate assembly that is not in the assembly I'm debugging. It used to work fine, but now it locks up. If I run the executable outside of Visual Studio (without debug) I at least get a runtime error like you'd hope for. I don't even get that when debugging.
What will I do to allow other forms to perform while crystal report view is running?
Heres the code:
Public Sub printCurrentHistory()
If dt.Columns.Count = 0 Then
With dt
.Columns.Add("update_time")
[code]....
I've have found answers here frequently in the past just from browsing. But now I'm completely dumbfounded.
I'm using Visual Basic 2010 Express, on Win7 32bit. My application talks to an Arduino via a virtual com port provided by a cheap Bluetooth to serial adapter. I use a text based protocol that is working fairly well. BUT one method in my code, taht seems functionally equivvalent to the other methods is locking up my whole window.
It does this whether I'm debugging or running the exe.Below are the offending method, and a simmilar one defined above it that works with no problems.
[Code]...
If I comment out the cal to write, everything works fine. Aside from me setting some state bools and playing with button titles in the first method, I can't see the difference as to why one works fine and the other hangs.
I really hope someone has some experience in the SerialPort object and VB that can shed some light on this.I've tried everything I can think of. I thought maybe it was the inline concatenation, so I dim'd a local and assigned the string to it, and passed that to Write. But I have another method that uses inline concatenation that doesn't do this.
I use VB 2008 express edition and i have this problem.I want to make a program that password locks any folder you want.(Using Icacls from command promt).My problem is that when i run the program
Code:
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
If My.Computer.FileSystem.DirectoryExists(TextBox1.Text) Then
[Code].....
All this is done becouse i can't save the listbox contents in My.Mysettins.If anyone would be able to show me how to do it i would be helpfull.But please don't give me 50 lines of ununderstandable content.I want something that i will be able to understand becouse there no reason if i use it without knowing what it does.
I have a combo box (named cboGrade) that includes three different options (3rd, 4th, and 5th). I want to make the user be required to select an option from the list and then once the selection has been made, lock the control until either the user finishes the game or clicks the button named btnBeginAgain. How do I do this? I'm using Visual Basic 2005 Express Edition.
View 3 RepliesI have a windows form. On it is a text box and send email button.When you click the Send Email, it sends the contents of the text box via the System.Net.Mail
Private Sub SendEmail()
Try
Dim MyMailMessage As New MailMessage()
MyMailMessage.From = New MailAddress("myemail@email.com")
MyMailMessage.To.Add("myemail@email.com")
[Code]...
1)What are different types of Cursors?
2)What are diff types of locks? In some sites-
Four types of locks availbale in ADODB
1.Optimistic
2.pessimistic
3.batch optimistic
4.readonly
In some sites Forwardonly , lock,adLockUnspecified
What are exact locks,can somebody tell me?
3) What is Z order Precedence?
4) dim X,Y as integer
They ask me X is of which datatype in VB & in VB.net? I told integer in both Vb & VB.Net,they told me wrong?
I am making a program to test whether or not a host is online, assuming that host has blocked methods such as ping and netstat -t etc....
So I decided to try and connect to it, but the thing is every limitation I have set doesn't work. The program locks up for a few seconds (which I don't want in the first place) and I cannot terminate the client after say, 100ms of trying to connect.
[code]...
I have tried client.ReceiveTimeout but that didn't speed up the process, still takes the same amount of time for the program to respond.How should I go about testing if the server is up now? Or is there a way where the program wont lock for a few seconds as it does with the TCP method.
I am trying to run a backgroundworker to load data from my DAL (which is available in another class). I want to keep the UI available and not have the "locked up" feel while the object is loading.When I create a simple backgroundworker and Sleep the UI stays responsive and my controls can be updated after the sleep. As soon as I replace the sleep with a call to instantiate the object from my DAL, the UI locks up. Is there someway I can instantiate this object using the background worked and keep the UI responsive?
When the situation object is instantiated it could take several seconds for it to load completely, during this time is when the UI is locked up... It does eventually load just fine.
Private WithEvents backWork As New BackgroundWorker()
Dim sit As Situation
Private Sub btnLoad_Click(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs) Handles btnLoad.Click
[code]....
I have a Windows Forms application created in VS2005 which runs fine on the user desktop but when running in Terminal Server session it frequently locks up when the remote desktop window is minimised and the user is working locally.There is plenty of RAM on the server so this is not an issue, the only solution so far has been to force the user session to log off on the Terminal Server and then reconnect.
View 14 RepliesI have a quite simple application that is having some random locks up. It's just a few text fields that the user fill it up, 3 sets of Radio buttons, one of them with flags to chose the language and click the PDF button. The application uses iTextsharp to load a PDf template, insert the text into it, depending on the language loads some extra text from a .xml file, and depending on the radio button removes the images from the PDF, closes the pdfstamper and uses [Code] to open the file with whatever PDF application the user have installed and closes itself.
Sounds simple, but after the application is installed in the machine (never in debugging mode) it randomly locks up the application. I tried re-publish the application commenting out the Start(filename) line and the thing stopped locking. And I double checked it, re-publish with the line again and it locked after just a few attempts. [Code]
I'm have a quite big application which have 2 serial ports and access 1 DB (running on Background workers). I'm experiencing some random locks while the application is running and I started looking for something that could cause it. One of the obvious possibilities would be if I had in the GUI thread some While_End that would never return.I have one While_End in my GUI thread but IMHO it does not look like it would lock, so I want your opinion: Does the code below looks like will lock?? If 'yes', Why ?
[code]...
Does anyone can imagine a scenario where this While_End would not return ?
I'm using Visual Studio 2008 and developing a VB.NET application. I'm having strange lockup problems with my program, but only when Internet explorer 8 is opened.
When I cover my form with another window and then uncover it, I find that it has locked up. My program has no references to IE and the only thing it even has to do with IE is using Process.Start with a web address.
My program works fine and exactly as it should, but only when IE is not opened.
Does anyone know why a program would lock up only while IE is running?
Edit: I've done some digging and I've found the offending thread in my program.
I don't know what starts this thread or what it does, but when I kill it, my program no longer freezes. The thread is one of the CreateApplicationContext threads, here is the last few items in the stack trace of that thread.
6 ntkrnlpa.exe+0x897bc
7 ntdll.dll!KiFastSystemCallRet
8 mscorwrks.dll!LogHelp_TerminateOnAssert+0x61
9 mscorwrks.dll!DllUnregisterServerInternal+0x10523
10 mscorwrks.dll!DllUnregisterServerInternal+0x10542
11 mscorwrks.dll!StrongNameErrorInfo+0x34387
12 mscorwrks.dll!StrongNameErrorInfo+0x34815
13 mscorwrks.dll!CreateApplicationContext+0xbc35
14 KERNEL32.dll!GetModuleHandleA+0xdf
Process explorer says my program is using no CPU nor throwing any exceptions while it is hung.
I have a problem with releasing locks on a thread. [Code] If Me.IsStarted Then 'checks if my service is started and ready of service requests 'code here to enqueue my job and objRxResult with the service so it can populate it with the result before Pulsing back 'the service has its own thread that it dequeues jobs off of and processes them on it own time 'during this key enqueue phase we block attempts to stop the service, thus the _objIsStarted lock [Code].
View 4 RepliesI have a do until loop. But whenever my program get's to it, it always locks the application so I can't click on anything until the loop is finished. How do I fix this? I want to be able to stop the loop with a stop button.
View 11 RepliesIs it possible to force the screensaver to appear whenever a computer becomes locked? Specifically on XP, 7 if possible.
View 2 Repliesi want to know how to hide files and folders at system/kernal level. Those files must not be accessible through any means untill they are unlocked again with same method. I want to create an application similar to Folder Lock apps commercially available
View 11 RepliesI have created an application using VB 2008 Express on an XP machine. I created a deployment package and installed it on other XP machines with no problems. I tried it on a Vista machine and all seemed well until performing a serial port function. It simply halts/locks up. I have to close it in task mangler. I thought I would circumvent the problem by building and publishing it on the Vista machine. While running the program from VB express the program functions perfectly on that Vista machine, but when I publish and install it on same it still crashes at the serial portion of the program.
View 2 RepliesI am considering a piece of code that will manage access to a collection object from multiple threads - add, update, remove, clear. OK ... so I have put a sync lock within each method, but what is not clear from the MS documentation is exactly how the sync lock is behaving. Is it locking the piece of code it wraps? Or is it locking the object? And if it is locking the object a private static object should lock out any code locked on the object within all instances of the object? i.e. if an add operation is underway, an update, delete or clear will wait for the lock to be released.
Finally, if I have multiple threads contending for the sync lock, how is the release managed? First come, first serve? random (from my p.o.v)? Is there a chance that two separate threads could blunder into 'locked' code simulataneously?
I'm using VB 2010, and am trying to add a simple TTS function to my program. I'm able to create a voice object, and get it to speak (Voice.Speak("whatever") with no difficulty.
The problem I'm having is that while the "whatever" is actually being spoken, the program doesn't seem to respond to input. The input does show up once the audio is through, but I really need to be able to detect some input (say, a mouse or button click) during a message and respond immediately, perhaps even stopping the audio.
Reading a .txt file in VB.net. My file path is C:UsersMyLilMulePepeDocumentsVisual Studio 2008Projectscurtain_calls.txt.
This is my line of Dim LoanOptionsFile As String = "C:UsersMyLilMulePepeDocumentsVisual Studio 2008Projectscurtain_calls.txt"
I can read the file when I run the program, but how do I write the file path so that someone else can download my program and file and read the file on their system?