Form Being Disposed Of Randomly

Dec 29, 2010

Protected Overrides Sub LoadForm()
MyBase.LoadForm()
Try
'StartProcess might be causing an error (error msg is issue with loading config, which would be incorrect)
StartProcess()
[Code] .....

I can run this 100 times under the exact same conditions and it seems like 40 times it will crash with the following error:
"Cannot access a disposed object. Object name: 'frmImportExport'."

It will either die on
'within StartProcess()
Dim __Delegate As New _Delegate(AddressOf StartProcess)
Me.Invoke(__Delegate)
or
Dim D As New _Delegate(AddressOf SOPERATION)

The form isn't being disposed manually anywhere that I see, and this code is being executed on formload. It's a subform that is to be displayed within a main form.

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Sep 22, 2009

Using VB 2005 with .Net 2.0.

I have a form which loads another form, does a little initialization, then hides itself and shows the other form. When the user finishes with the second form, it returns back to the first.[code]..

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Feb 8, 2012

If TextBox1.Text = "Welcome!" Then
MsgBox("Welcome!")
Else
MsgBox("Error!")
Me.Close()
End If

I receive "Cannot access a disposed object (Form1)" when the error arrives.

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VS 2010 Difficulty Accessing 'disposed' Form?

Jan 18, 2012

I'm having a strange difficulty. Here is the order of events:User presses button on form1 New Form object is created for from 2 New form object '.show' command is fired Form 2 opens correctly In the Load Event of Form 2, the form attempts to do various things in a try, catch, finally clause On catch, I close form2 down '.close' as it cannot be used as something has gone wrong with the execution However, my problem is this. It is acceptable for things to go wrong on the from 2 load event which is why I have implemented the try - catch functionality. However, when I close the form2 down as a result of the problem, a real error ocurrs 'Cannot access a disposed object' and the VB IDE refers me to Form1's '.show' event for Form2.

It is almost as if the form hasn't fully 'shown' before I am closing it down. Does anyone have any idea what the problem is here? Do I need to close down Form2 ourside of it's Load event handler so that Form1 thinks it has loaded correctly?

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Jul 17, 2010

By 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

[Code]....

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When try to open in design mode a form (VB.NET), in which I have a custom UserControl, I see the message from Visual Studio:

Microsoft Visual Studio
The control MyNamespace.MyUserControl has thrown an unhandled exception in the designer and has been disabled.

Exception:
Cannot access a disposed object.
Object name: 'SplitterPanel'.

Stack trace:
OK

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[code...]

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Apr 26, 2010

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Another thing I plan to achieve is also a random number generator that will display a number on a ball that rolls on to the screen. So the displaying of a number will be timed to show up when the ball comes in focus. I have some code that I have used previously to generate a number, but I wanna get the generated number to show in time with the ball rolling up.What are some wait commands to use in vb .net? This is the code I am using to randomly generate a number.

vb

Dim r As New Random
TextBox1.Text = r.Next(0, 150)

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Apr 12, 2011

I am trying to write a program that takes the input of a CSV file, makes modifications, and prompts the user on how to handle certain modifications.

I have the parsing of the CSV file complete, the handling of most of the string manipulation down, and the user interface complete, except when it comes time to move onto the next record.

I had it display the form as a modal dialog, and used me.hide() once it was over to continue with the program. However, when it gets to the next ShowDialog(), it says that the object has been disposed! I've tried a modeless dialog, with a while loop that waits for a boolean to be flipped by a button on the dialog being clicked, but that, as predicted, did not turn out so well and just shot the processor load to 100%.

One thing I notice in looking around is that I have everything based on the "home" form, the initial one that comes up when the program is run. Is this incorrect coding? Does this require the prompt being on a child form?

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Feb 10, 2011

i am facing a huge problem with the "Cannot access a disposed object. Object name: 'TreeView'." error.

On a windows forms of mine i use a custom windows explorer object.

And here come the code parts...

On the selected node event, i load the images found within the selected directory to the FlowLayoutPanel.

Private Sub ExpTree1_ExpTreeNodeSelected(ByVal SelPath As String, ByVal Item As ExplorerControls.CShItem) Handles ExpTree1.ExpTreeNodeSelected
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[Code]....

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Apr 18, 2007

I found an error - cannot access a disposed object in my project.

i using vs2005.

but before this, i using vs2003 and this error doesn't occur.

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Mar 26, 2009

I have a windows form in .NET that will serve as a wizard to achieve something. This contains 3 steps: Step1, Step2, Step3.

Each step is again actually a user control. Main form contains a panel that display the current Step. When I change among steps then:

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2) Clears the main form panel

3) Initialize the user control of next step and add it into the main panel

Now, the issue is, User control of step one contains one more user control. When I change to another step and come back to step 1, I get following error:

"Cannot access disposed object."

Because I have to first dispose the user control before actually displaying the another step. And when I come back to step 1 and tries to open the user control on step 1, it gives the aforementioned error.

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I tried running code analysis the first time and found what it appears many others on SO doing the same have found: an abundance of

In method 'SomeMethod()', object
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[code].....

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My program involves accessing a print preview dialog.

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I just installed VS 2010 Ultimate Beta2. installation was successful. When I perform the scenario of (File --> Open -- > New), I get that error message.
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Code:
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Source=mscorlib

[code]....

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Oct 8, 2010

I'm attempting to run different tasks in there own processes, waiting until each is done while keeping the UI responsive. So far it works exactly how I want it until I try to reuse some of those processes....here is a sample of the

Private WithEvents TaskOneProcess As Process
Private WithEvents TaskTwoProcess As Process
Private WithEvents TaskThreeProcess As Process

[code]....

This is a over simplification of what's going on but it gets the point across. So it works exactly as expected, a button is pressed and the sequence starts. As each task gets disposed it recalls the StartFixing statement which then calls the next one in order until they are all done. BUT when I go to do it a second time the Disposed never fires assuming since it's already disposed. How do I recreate the same named process so it can be reused and still have it fire the disposed event?

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Mar 4, 2010

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Oct 4, 2010

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[code]...

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Feb 16, 2012

I got the error having the stack trace...

System.ObjectDisposedException: Cannot access a disposed object.
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at System.Windows.Forms.Control.CreateHandle()
at System.Windows.Forms.Control.get_Handle()

[code]....

It doesn't give error when I just switch the order of the .show and .close method

Friend Sub GoHome(ByVal sender As Form)
InTransit = True
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I am having trouble trying to figure out why I'm getting this warning in following code.

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[Code].....

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[Code]...

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Mar 20, 2010

I got the "infamous" 'Cannot Access Disposed Object.' error when I was attempting to open a form again after I had closed it. The fix (even though it's annoying), is easy enough; but again it's managed code problems and weirdness I still haven't changed my opinion that I won't be using MS .NET after this when I get my development box back to normal. BUT anyway the solution is self explanatory and very easy (and somewhat obvious) [Code]

the Application hiccups with a very nice message, after you close the form down and try to reopen it, that says: Cannot access Disposed object. So, my thought is that the "IsDisposed" property runs some sort of function to determine the Garbage Collection state and does a collection, or updates the request for the collection to be done.

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