Threading Error On Form Close
Aug 15, 2011I'm upgrading some code from VB2003 to VB2010. I'm now getting an error when I try to close a form from a media player event.
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Properly Close A Form While Multi-threading
Jan 4, 2012I thought Me.Close() works, but hey I'm a noob at this. Right now I'm using:
Form2.Show()
Me.Dispose()
Me.Close()
but now that I've published it, I have to pull up my task manager and do end process to actually close the app. This wasn't a problem until my office started using a public drive and everybody was using the program at once. An error popped up saying that the connection string wasn't initialized, but it worked on the computer that opened the app first. Maybe the real issue isn't properly closing the form, but that is annoying that I have to use my task manager to close my app.
Close A Form That Has A Validation Error?
Oct 10, 2011A wrong entry into a textbox causes the errorprovider to appear (set in the validation event e.cancel=true).Can I close the form (X in the upper right corner)?
View 18 RepliesError On Me.Close() Event Of Form
Sep 15, 2010I have a VB.NET application writtene using VS 2008 and have been receiving a weird error when a form is closed - it gives me the following error message:
Windows has triggered a breakpoint in MyApplication.exe.
This may be due to a corruption of the heap, which indicates a bug in MyApplication.exe or any of the DLLs it has loaded. This may also be due to the user pressing F12 while MyApplication.exe has focus. The output window may have more diagnostic information.
The immediate window then has this error message:
Critical error detected c0000374
I tried fixing this by just hiding the window, but this simply moves the error up the chain and I get an error when exiting the program as it tries to close the form:
Unhandled exception at 0x7700e29b in MyApplication.exe: 0xC0000005: Access violation writing location 0x00000000.
I don't think I'm doing anything particularly strange in my application - reading from and writing to a database is about as complicated as anything gets for me. I've tried using AppVerifier, but then the program won't even open. I'm at a real loss as I don't know anything about memory management, or what a heap is. I just can't work out why this error is happening
By the way, the application compiles and runs fine on my old 32-bit computer running WinXP professional, but my new 64-bit Windows 7 computer is just not having it, even though I have targeted the compile for x86 and followed every bit of advice I could find on geting it to work in Windows 7. Should Windows 7 and VS 2008 really be incompatible? Do I need to get VS 2010 instead?
Error When Hiding And Close A Form
May 1, 2012I have a log in form, and once you log in, it's supposed to show a new form.
The problem here is...if I use Me.Close(), then both of the forms close, and the application terminates.
If I use Me.Hide(), than the first form doesn't actually stop running in the memory, and proceeds to run in the background even after you're done with the program.
Form Validation Error, Does Not Allow To Close The Form
Jun 8, 2012I am using the following code
Private Sub txtAIT_Validating(ByVal sender As Object, ByVal e As System.ComponentModel.CancelEventArgs) Handles txtAIT.Validating
If txtAIT.Text <> "" Then
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In form I have a close/Cancel button, and I set Causes Validation = false, and on its Click I used "Me.Close", but form can not be closed.
Button Works fine, but form can not be closed until text field has been validated.
Form Close After An Error Occurs During A SaveFileDialog
Oct 13, 2009I am having an issues with my code causing my forum to close after an error occurs during a SaveFileDialog. My problem is if the form closes after an error occurs that doesn't save the file, the person would lose their text they made. If there a way I can embed the code in an If statement or Try catch so it only closes if the file was saved? Here is my
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Close Form = Cannot Access A Disposed Object Error?
Jul 17, 2010By default my app loads the activation form. On the form load it checks if the license is valid and if so i want it to close/hide the registration form and open the form that starts my app.
When i try to do this it crashes my app with the following error
Quote:
Cannot access a disposed object
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
'check if a valid license is available
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Close The Form Without Entering Any Input And Not Generate An Error?
May 8, 2011i am using validated function and i would like to close the form without entering any input and not generate an error. is there a method that changes the exit command to allow this?Sometimes the answer is so blindingly obvious i fail to see it.
View 1 RepliesDesigner Generated Lookup Throws Error On Form Close
Jan 17, 2011I have a project with multiple forms that are used to edit tables in a project data source (access DB). All the forms work fine, except the ones that use designer generated lookups.
When I am editing a row in a bound DGV on the lookup forms, they function fine, and the save button works fine. However, once I go to close the form it starts throwing "System.ArgumentException: DataGridViewComboBoxCell value is not valid." multiple times.
I've created applications similar to this in VS2008 without any issues.
Runtime Error 217 Appears When Close The Last Form Of An Own Made Program?
Jul 13, 2009I've made a project with serveral forms and instances of classes.The program works fine until the last form close.2 messages were shown:1. The exception unknown software exception(0x0eedfade) occured in the application at location (?????????)2. Regular dialogue "Runtime error 217 at (????????)
View 2 RepliesVS 2008 : Modal Form Hide Instead Of Close - Main Form Does Not Close
Mar 20, 2009I have a main form that has a button with which a smaller form is shown. Think of the smaller form as the Find/Replace dialog in many applications, such as Notepad. It's important that the form is (what I believe is called) modal. What I mean is that it always stays on top of the main form. I ensure that by calling the Show method with "Me" as the owner argument. Whenever the small form loses focus it will not disappear into the background but stay visible (albeit out of focus). If you don't understand open up Notepad and have a look at the behavior of the Find/Replace dialog.
Here's my problem: instead of actually closing the form when the X is pressed, I want it to simply Hide itself, so its position and the state of any controls (checkboxes etc) is preserved automatically.To achieve this I simply cancel the FormClosing event and Hide it:
vb.net
Private Sub Form2_FormClosing(ByVal sender As System.Object, ByVal e As System.Windows.Forms.FormClosingEventArgs) Handles MyBase.FormClosing
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To show the form, I use the following (note the (Me) to make the main form the owner of the form; this ensures that it remains visible even when it is out of focus):
vb.net
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Form2.Show(Me)
End Sub
Now. When I run my project, and open the Form2 (small form), then hide it again (by 'closing' it), I can no longer close the main form (Form1)! It seems the main form cannot close when the small form still exists (albeit invisible)...?? When I don't use the Me argument in the Show method, I don't get the behavior I want. I know I can set the TopMost property to True but that will also cause it to become visible on top of all the other forms, even windows not part of my application.
Error : Private Function Close() As Integer Implements IVsPersistDocData.Close Has Multiple Definitions With Identical Signatures?
May 12, 2010I have two Close() functions in same class as below:
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[2008] Notify Icon When The User Clicks The Close Button That It Doesn't Close The Form?
Jan 17, 2009I have set up a notify icon for my form. I want to make it so that when the user clicks the close button that it doesn't close the form it just takes it to shows the notify icon. They can exit the program from the notify icon. Can someone tell me how to keep it running?
View 2 Replies.NET End Vs Form.Close() Vs Application.Exit Cleaner Way To Close One's App?
Feb 12, 2011sometimes, when I use Form.close() when debugging my program, although the form is closed, the application is still running. I noticed this behaviour when using the msgbox function.
View 3 RepliesVS 2008 When Close The Main Form All The Forms Close?
Aug 30, 2009my web browser is my main form and it has a number of sub forms , how can i set it that when i close the main form my sub forms dont close ?
At the moment when i close the main form all the forms close
Vb2010 Close Of The First Form Close The Application Even If A Second Form?
Feb 14, 2011I try to transfer a vb6 application to vb2010. In the vb6 I start with a login panel that the user enter uid and password autenticate with the DBServer if ok show application main menu and close the login form. the order of the me.close() after the mainform.show() does not change, The application ends.
View 5 RepliesForms :: When Me.close() Doesn't Close Form
Mar 2, 2009I have a situation where me.close() doesn't close the form. I have a form with a button with the code seen below. What happens when the button is clicked is the new form shows, but the original form(calling form) is still there. When I go into debug mode, I can see the me.close() execute, but nothing happens (calling form stays open). When I close the second form both forms close. If I comment out the call for the second form to open the first form closes without problem.
Private Sub cmdNext_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdNext.Click
Dim f As New frmOrder3
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Threading Error - Cannot Use RichTextBox
Apr 1, 2010I need to ping to a port. It is working, then I tried multi threading. I need to show the result in richtext box, but it shows error.
The code is
Imports
System.Threading
Public
Class Form1
Dim t As Thread = New Thread(AddressOf Me.ProcessBioAdmin)
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Error got is:
Cross-thread operation not valid: Control 'RichTextBox1' accessed from a thread other than the thread it was created on.
Threading - Access A Value Of A Control Within A Form Outside Of The Form Class
Jun 3, 2009What is the best way to access a value of a control within a form outside of the form class. I have a lot of functions defined in a module, one of these functions requires a series of values from controls in my main form such as the FolderBrowserDialog.SelectedPath element. I understand that these cannot be accessed in the format form.FolderBrowserDialog1.SelectedPath and that they need to be accessed using a delegate. This is the part I am stuck with.
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Threading Error - Protocol Version Not Supported?
Jul 26, 2011So I have some users that are getting error: This Protocol Version is Not Supported on the following line of code in Red:
Private mobjThread As Thread
Private Sub StartServer()
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I am not able to recreate it on my machine or the 4 other local machines I have tested it on here.
VS 2008 - Multi Threading - Error Code
Oct 11, 2011Wheres my error on this code...
Imports System.Net
Imports System.Threading
Public Class Form1
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Basically what I want to do is that User will select how many thread w/c is the PickThread.value, then it will do the stuff.
VS 2008 Simple Threading But Strange Error
Dec 21, 2011i have tryed using multithreading with my program with no luck/I just get a strange error thrown at me no matter what i try [code] Then i get this error:An error occurred creating the form. See Exception.InnerException for details. The error is: ActiveX control '6bf52a52-394a-11d3-b153-00c04f79faa6' cannot be instantiated because the current thread is not in a single-threaded apartment.
View 13 RepliesHow To Close One Form In A Project And Note The Entire Project When Using Me.close() In Visual Studio 2008
Mar 22, 2010I am really new to Visual Studio and VB and I am having trouble closing a single form:
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Me.Close()
End Sub
When I use Me.close() associated with this button it closes the entire project and not just the single form can anyone.
Instantiate Multiple Sql Connections To The Same Database Via Threading Without Getting An Error?
Apr 8, 2011I'm running a program where I call a function which creates a database connection and then runs a stored procedure. I call this function four times from four separate threads. I get an error (Login failed for user 'sa'. The user is not associated with a trusted SQL Server connection.
Exception Source:
.Net SqlClient Data Provider)
when I use multiple threads, but if I have the threads run one after another I have no
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Multi Threading - Automatic Error Notification System
Feb 1, 2010Multi threading in vb.net, in one of our program I provided an automatic error notification system that gives alert to my email when an exception error is occurred. The error notification includes the name of the form, the exception error details, the event name and the screenshot of the software during that particular instant.
View 6 RepliesThreading - Form Doesn't Load Up
Feb 11, 2009I want to build in the Mongoose web server into my application. My program consists of a form and a module. The module contains the Mongoose code copied from here: [URL] If I call the Main() function in the module from my form's Load event then the web server starts correctly and I can connect to it. However, that's as far as the applicaiton goes - my form doesn't load up. I guess this is because my application is only single threaded and the Mongoose code basically puts the thread into sleep mode waiting for a http request.
So, the question is how do I go about getting Mongoose into a separate thread that starts up when my application starts, but then allows my form to load and be operable?
Get A Button On Form A To Open Form B And Then Close (not Hide) Form A When Clicked?
Jun 12, 2009get a button on form A to open form B and then close (not hide) form A when clicked?Background: I am coding a VSTO application for Excel in VB2008.
Private Sub FormAButton_Click(ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles FormAButton.Click
Dim FormB As New FormB
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Multi-threading Forms - Open A Separate Form As A Separate UI Thread From The Start Up Form
Oct 27, 2011I have a few forms that have a lot of really intensive updating along with a great deal of user interface (text boxes, button clicking etc) Is it possible to open a separate form as a separate UI thread from the start up form that called it to "show" or open or whatever the new method might be?
View 6 RepliesVS 2008 Threading + Form.Show() Hanging?
Feb 23, 2010I'm not sure how to explain what's happening but it seems to be deadlock, i did search along the forum and actualy did find who had the same problem as i did. Unfortunatly i'm too new to this Threading and could not understand why does this deadlocks happen or how to avoid them.I'm using the following
Dim t As New Threading.Thread(AddressOf MyTestingSub)
t.Priority = Threading.ThreadPriority.BelowNormal
t.IsBackground = True
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