Abort FormClosing() - App Will Not Close And Revert To Previous State
Feb 13, 2010
I have a code snippet that I want to run when the app is closing. So, I used FormCLosing event. But now i wanna place a confirmation message for exiting. Like, if the user clicks the Exit(X) button, there'll be a prompt, if he clicks NO, then the app will not close and revert to previous state. Now I find that hard to achieve using FormClosing event. because it'll get executed no matter what button the user clicks.
How do I revert a form including the controls back to a original state without closing the app? For example I got a picture box and 2 buttons in a form..
I have a simple Windows Form that hosts property controls at runtime. When the user clicks Close [X] I want to keep the window and its contents alive rather than killing it by handling the FormClosing event, canceling the event and simply hiding the form.
That's fine but at close of the application I need to actually close the window. I implemented the below but it feels kludgey. Is there a simpler, more clever way to handle this situation? (The form's controller calls KillForm explicitly after it receives a closing event from the main window.)[code]...
i'm making a vb aplication (only my second one so dont be to cruel) and i'm just wondering how to make it so that when somebody closes my aplication down and open it back up it restores it to the same state, i've had a look on google and the only thing i can find are how to remember the size and position of the form using the registry and also using flat file databases to hold the values of all the text box's but is there an easier and more elegant way
I have several forms that are "reused," or vistited more than once per each time in the whole program. In VB6, using Form.Show() would show the form in its original state (the state is was when created in the designer). After closing this form (Unload Me), showing it again would still show the form in its original state.
I am coding in VB.NET 2008, and noticed that when I reopen a form I had closed during a session using my program, the form is in the state it was when I closed it (labels and listboxes filled with data), and not in its original state. I currently have the Form.Closing event filled with code to clear all of the controls, but I think that there must be a better way to "clear" or "reset" the form.
recommend the cleanest way to save / restore a winform's location and state? For some time now I've been using a method similiar to what I posted below (based on the CodeProject: [URL]..The problem with this method is that when the form loads, it is drawn in an initial location, then moved / maximized afterwards. The effect creates somewhat of an eye sore watching the window draw, then quickly update... but in Vista it is a lot more obvious.
What I would like to do is restore a form to it's previously saved location / state invisible to the user, then show it once it's where it needs to be. Or, just know of the ideal way this is supposed to be done - specifically in Vista.
How do you restore a dataset to the previous state before updating the database with a data adapter? I have a concurrency update problem that I believe to be caused by this. The update fails during the update and a rollback command is issued using a SQLTransaction object. However, now the rowstates of the rows that did not have errors have been changed to unchanged. So this record is no longer availible to be inserted into the database. When I updated the value that could not be null and then test the second update which runs just as the first does then I get a concurrency error. The update code is below:
I was investigating on Google wether there was any sort of code that would return the current state of a laptop's 'lid'. I need to be able to find the state of the lid and be able to execute code before the defined event in Windows Power Management is executed.I have come across ExCreateCallback and stuff on MSDN however I wouldn't have the faintest on how to implement it into VB.
I have a textbox that requires the user to input the value of the Value-Added Tax of that certain area. I tried testing 12.5%. The string is converted to decimal then divided by 100 so 12.5/100 = .125. But when the program writes the value to a file, 0 is writen. not .125
As my Christmas week side-project I thought I'd knock up a quick console app that I can run from the windows Start-up folder.
The application is going to delete some unwanted Global Corporate Desktop Icons (I like to run a clean desktop - is this common?) and Reset the Windows 7 Theme to my lovely Visual Studio 2010 graphics.
I have read the reasons why this shouldn't be done pro grammatically for the user but I feel this case is different as every morning I am manually deleting the icons and resetting the theme (policy is not stopping this - just reapplying it every morning) so I though this little side project could save me time in the long term.
I am deleting the Icons OK but I am struggling to set my theme ala:
Dim key As RegistryKey = My.Computer.Registry.CurrentUser.OpenSubKey("SoftwareMicrosoftWindowsCurrentVersionThemes", True)
[Code]....
This is setting the registry key correctly but not applying it. Ultimately I may try a simple Wallpaper Set but I would like to use the theme if possible!
i am making a revolutionary web browser called bolt and i have nearly finished it! I would like to add settings but the problem is that when i restart the web browser settings revert to default i tought about saving them into an ini or dat file called setting
I'm currently in the process of building a text editor type program, and have run into a brick wall. I haven't done VB in years, so I may just need a little reminder on some things. I have coded everything so far as far as opening files, saving them, changing fonts, colors, etc. However, I'm looking to add a Close button to my menu strip that will just close the currently opened file, and not the entire program, while also ask the user if he/she would like to save before closing the file, and then if they select yes, it will show the save dialog, and if not, it will go ahead and close the currently opened item.
Code to launch a wmi query on remote computers. This code runs in several threads at the same time.
[Code]...
For Each objMgmt In oquery.Get 'on some pesky windows XP machines this line hangs forever regardless of the timeout and the thread can never be used to get info from another computer. the only way to "release" this is to reboot the target computer.
I have this notepad that is all ready to go now except for one thing..when the user uses the X to close the form she does get a confirm exit without saving changes dialog box, the problem is that she did in fact save her changes. So for some UnGodly reason ...,, my event is not picking up the fact that changes have been made.lution to this?? I have been up and down the net LOL..looking for ONE that works here is the code that I have going on for that event:
Private bIsChanged As Boolean = True #Region "events" Private Sub frmMyNotes_FormClosing(ByVal sender As Object, ByVal e As
I have to write some code for my app that if the application crashes or my machine crashes or for whatever reason the application closes abnormally and the user was in the process of making changes, I need to write some code that will at least ask the user if they wish to save their changes to the database.
With that said, what I have done thus far is set a flag in specific "TextChanged" events of certain controls. When the above scenario happens, I check this flag in the "FormClosing" event. In testing this, I selected a record from a DataViewGrid which then populated certain controls where this flag is set. I realize that at that point the "TextChanged" event is fired because the fields receive a value and that boolean flag is set to "True".
My issue is that this flag gets set even though the controls get populated but no physical data changes have been made. So, what I'm wondering is whether or not their is another event I can check other than the "TextChanged" event that will truly detect if any new changes have been made and at that point set the boolean flag to "True".
VB.NET 2010, .NET 4/I have a System.Timers.Timer object that does some work on its elapsed event:
Private Sub MasterTimer_Elapsed(ByVal sender As Object, ByVal e As System.Timers.ElapsedEventArgs) Handles MasterTimer.Elapsed MasterTimer.Enabled = False '...work... MasterTimer.Enabled = True End Sub
My problem is that the work that it's doing sometimes gets stuck. Part of the work is serial communication so it might be getting stuck waiting for a response from something. I've already modified my serial communication code a bit to hopefully solve the problem. However, this timer is basically the heartbeat of a production control application and it is very bad if it were to stop for any reason. I was thinking that it might be nice to put in a fail-safe timeout so that, if the "work" is taking too long, the timer could re-enable itself and try again. I was thinking of something like this:Move the work into a subroutine and create a delegate:
Private Delegate Sub WorkDelegate() Private Sub Work() '...work... End Sub
Call the work by invoking the delegate and then use WaitOne(timeout) on the IAsyncResult to specify a timeout:
Private Sub MasterTimer_Elapsed(ByVal sender As Object, ByVal e As System.Timers.ElapsedEventArgs) Handles MasterTimer.Elapsed MasterTimer.Enabled = False Dim workDel as New WorkDelegate(AddressOf Work)
[code]....
In that it would re-enter a subroutine that is already running? Is there a way to abort Work() if it hasn't finished after the timeout? In other words, just cease execution of Work() if result.IsCompleted Is False after WaitOne?
Disclaimer: I know that Thread.Abort is evil. I'm using it as a last resort since some I/O functions (e.g., File.Exists when used on a non-existing network share) block for a large amout of time and do not allow you to specify a timeout.
Question: Is it possible to Abort (as in Thread.Abort) a worker thread started using Delegate.BeginInvoke or do I have to do the Thread handling myself?
In one of my multi threading programs I cannot get my threads to abort. I have about 5 threads and the threads starts one at a time. By the time the fifth thread is started the program gets really slow. The program will not execute pass LoadWheelStn1.
Code:
Private Sub LoadWheelStn1() If sPortOpenFlag = "T" Then Dim MyThread1 As New Thread(AddressOf ThreadStn1)
I have a single windows form application that is running in system tray icon.If the user press X button of the windows form a messagebox is displayed with Yes and No ( Yes ->close the form---No->keep the form running in system tray icon).I was thinking to prevent the scenario when the user open another instance of the application when there is already an instance running so i have used this code :
If Process.GetProcessesByName(Process.GetCurrentProcess.ProcessName).Length> 1 Then MessageBox.Show("Another instance is running", "Error Window", MessageBoxButtons.OK, MessageBoxIcon.Exclamation) Application.Exit() End If
The problem is that when i want to test this the message is displayed but after i press ok, a new messagebox appears (that one from Private Sub Form_FormClosing ).If i choose NO i will have to instance running!I have read that Application.Exit fires the Form_FormClosing event.Is there any possibility to cancel the triggering of the Form_FormClosing event?'this is the formclosing procedure
Private Sub Form_FormClosing(ByVal sender As Object, ByVal e As System.Windows.Forms.FormClosingEventArgs) Handles Me.FormClosing Try Dim response As MsgBoxResult response = MsgBox("Are you sure you want to exit", CType(MsgBoxStyle.Question + MsgBoxStyle.YesNo, MsgBoxStyle), "Confirm")
Private Sub frmMain_FormClosing(ByVal sender As System.Object, ByVal e As System.Windows.Forms.FormClosingEventArgs) Handles MyBase.FormClosing Dim log As String = String.Empty If File.Exists("watcher.log") Then Dim sr As New StreamReader("watcher.log") [Code] ..... No watcher.log file is being created/modified in the Release folder in my project, but it works when debugging and puts one in the Debug folder.
I have a hidden form in my app. When i call that form's Close() method fromanother form to close it, the form's FormClosing() and FormClosed() eventsare not raised. Is this behaviour normal and expected?
I'm working on a web application that uses the web browser control to get and set info from my website. The content on the site is pulled from different pages and the data the application stores becomes really huge so i used a background worker to do the work and keep the form responsive. On each loop i call to get the webbrowser's inner html so i can sort through it and grab what i need and it works; but only the first time!? After i call it the first time and try to call it again to update the variables the function hangs and then the console shows me a Thread Abort Exception, The try statement i used to contain it doesn't fire off an exception. When i debug the program and i get to that function, it hangs and then just stops working.
The function that loops:
vb.net Dim ids As String = GrabIDs() Dim IDCount As Long = ids.Split(CChar(",")).Length - 1 Do Until IDCount = 0
