Forms :: Object Disposed Exception In MyBase.Dispose()?

Aug 20, 2010

I am getting the following Exception when calling MyBase.Dispose ()ObjectDisposedException was unhandled.I tried adding a Try Catch around the call but it doesn't catch the exception.

Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
If disposing Then
If Not (components Is Nothing) Then
components.Dispose()

[code]....

FYI: The value of disposing is False

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Object Disposed Exception / Multiple Forms

Jan 21, 2010

I am using VB 2008 Express Edition.I have an app that has 2 forms (will be adding more). Button click on form1 opens form 2. The first time I run my app everything works fine, but when I click the close 'X' button on form 2 and try opening form 2 again by clicking the button on form 1, VB throws a Object Disposed Exception, Cannot access a disposed object.[code]

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Exception Found - Cannot Access A Disposed Object. Object Name:'System.Net.Sockets.NetworkStream'

Dec 31, 2009

Occasionally I encountered this exception message while trying to download file from a server using System.Net.FtpWebRequest and System.Net.FtpWebResponse Object.

Download a file.ftpRequest_DL.Method = WebRequestMethods.Ftp.DownloadFile get the response object
Dim ftpResponse_DL As FtpWebResponse = CType(ftpRequest_DL.GetResponse, FtpWebResponse)

[Code]...

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Random Object Disposed Exception?

Dec 8, 2009

I seem to be getting a random abject disposed exception.Sometimes it occurs when I move from 1 form to another, sometimes it happens when a timer activates.It says the object name is "". How am I supposed to look for an object called nothing. I'm using vb express 2010 on windows 7.

Code:
System.ObjectDisposedException was unhandled
Message=Safe handle has been closed
Source=mscorlib

[code]....

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Asp.net - CA2000: Object Is Not Disposed Along All Exception Paths

Aug 23, 2011

I am having trouble trying to figure out why I'm getting this warning in following code.

CA2000 : Microsoft.Reliability : In method 'Encryption64.Decrypt(String, String)', object 'des' is not disposed along all exception paths. Call System.IDisposable.Dispose on object 'des' before all references to it are out of scope.

[Code].....

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Opening Excel File,object Disposed Exception?

Mar 12, 2009

I am have an exception when I run the following code :

Private Sub MainMenuForm_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Try
'Save the Sum of the Existing "Excel" Processes:
For Each Proc As Process In Process.GetProcessesByName("excel")

[code]....

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VS 2008 Unhandled Exception - Cannot Access Disposed Object

Nov 19, 2009

I get this:
Cannot access a disposed object.
Object name: 'MainForm'.

Here is the code I'm running. It's after the MsgBox "Readme file cannot be found. Please put the original readme in the current working directory of this executable." (and it's dismissed) that I get the unhandled exception error.
Private Sub MainForm_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim readme As String = My.Computer.FileSystem.CurrentDirectory + "
eadme_ctb_v100.txt"
MsgBox(readme)
If My.Computer.FileSystem.FileExists(readme) = True Then
[Code] .....

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Forms - Error: Cannot Access Disposed Object

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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Hiding A Form Produces "Cannot Access Disposed Object" Exception

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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Class That Inherits Another Class In Which There Are Objects That Are Disposed In Dispose Procedure

Feb 14, 2010

If I have a class that inherits another class in which there are objects that are disposed in the dispose() procedure, do I use mybase.dispose? ex Class A inherits Class B. [code]

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.net - 'someObj' Is Not Disposed Along All Exception Paths?

Mar 11, 2011

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
'SomeObject' is not disposed along all
exception paths. Call

[code].....

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.NET SMTP SendAsync With AlternateViews Throws Disposed Exception?

Apr 22, 2009

I am trying to send E-mails asynchronously and it works fine as long as there isn't an AlternateView attached to the e-mail. When there is an alternate view, I get the following error:

Cannot access a disposed object. Object name: 'System.Net.Mail.AlternateView'
System.Net.Mail.SmtpException: Failure sending mail. ---> System.ObjectDisposedException: Cannot access a disposed object.

[code]....

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Cannot Access A Disposed Object. Object Name: 'NumericUpDown'?

May 29, 2010

i created a DatagridViewNumericUpDownColumn but i got error message Cannot access a disposed object. Object name: 'NumericUpDown' when i closed and reopen the form. what can i do to solve this problems? i checked from the web & i found the answer, but i I couldn't get authorized to view this thread. When i clicked on the link[URL]..It shown You are not authorized to perform this action.

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C# - Calling A Method In A FACTORY Class When Application Is Closed / Disposed Without Using Application's Dispose() Method

Mar 28, 2012

I am indifferent if you are a VB.NET or C# or other .NET developer. I have a FACTORY class like the following:

[Code]...

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C# - Cannot Access A Disposed Object

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
'Loop until all images are loaded.
LoadImagesToFlowPreviewPanel()

[Code]....

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Cannot Access A Disposed Object

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.

but when i convert to vs2005 and debug, this error occured.

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Cannot Access Disposed Object.NET

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:

1) Dispose the current user control by calling its Dispose() method.

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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Are Object SqlConnection And SQLCommand Disposed

May 20, 2010

[code]in this code, do the objects con and cmd get disposed because the return statement is placed before the end using statement.

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Cannot Acces A Disposed Object - Error?

Feb 26, 2012

My program involves accessing a print preview dialog.

It works just fine the first time. However, when I close the printpreviewdialog and then try to open it again (through the button) in the same run

then I get a "cannot access a disposed object" runtime error. Hence, it can only work once during a program run.

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Cannot Access Disposed Object - MarshalingWindowFrame

Jan 5, 2010

I just installed VS 2010 Ultimate Beta2. installation was successful. When I perform the scenario of (File --> Open -- > New), I get that error message.
Error message "Cannot access a disposed object. Object name: 'MarshalingWindowFrame'."

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Invalid Usage Of Disposed Object?

Mar 1, 2011

Invalid usage of Disposed Object - find which object is open or I am trying to access

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VS 2008 Cannot Access A Disposed Object?

Mar 4, 2010

I'm getting this error over and over again when I click the cross button on the main form which is a MDI parent form. How can I fix this error?

error:Cannot access a disposed object.Object name: 'frmmain'.

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VS 2010 Code Bug (Disposed Object?)

Oct 4, 2010

I am using the following codes:This code triggers my transport sequence. I am not having any variable sequences.

[code]...

What is going wrong? I reach the error at the first instance of "transport.Show()"

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.net - System.ObjectDisposedException: Cannot Access A Disposed Object

Feb 16, 2012

I got the error having the stack trace...

System.ObjectDisposedException: Cannot access a disposed object.
Object name: 'Button'.
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
fMain.Show()
sender.Close()
End Sub

why for the first case it gives error and why in second case it doesn't?

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Close Form = Cannot Access A Disposed Object Error?

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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.net - Cannot Access A Disposed Object When Opening External Exe File From Application

Jun 8, 2012

I've a problem with an application i have to use at work. That application is in .net (created by my company). The application call some object that are .exe file. When i try to open it i received the following error:

cannot access a disposed object

I know that it's not really revelant but i've got that problem on my pc and my collegue that use the same application doesn't received that error.I've already check their configuration and i've the same than us. I supposed there are some problems of compatibilty with the framework or thing like that.

Stacktrace
************** Exception Text **************
System.ObjectDisposedException: Cannot access a disposed object named "Form".
Object name: "Form".

[code]....

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Opening Form In Design Mode - Cannot Access Disposed Object

Feb 22, 2012

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

And the form is not displayed in designer. What to do?

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VS 2008 Check If All Forms Of An Application Has Been Closed/disposed?

Jan 20, 2010

How do you check if all instances of forms (or simply all forms of an application) has already been closed?

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.Net - Dispose Correctly Children Object

Aug 19, 2010

From code analysis (Visual studio), I got this warning:

[Code]...

The warning disappear but then the literal control isn't anymore being displayed on the page... EDIT Note that the code come from a Microsoft web page: [URL]

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.net - The Proper Way To Dispose Excel Com Object?

Apr 25, 2012

I have following code (obtained from online tutorial). The code is working but I suspect the way to dispose the Excel com object is somewhat not proper. Do we need really need to call GC.Collect? Or what is the best way to dispose this Excel com object?

Public Sub t1()
Dim oExcel As New Excel.Application
Dim oBook As Excel.Workbook = oExcel.Workbooks.Open(TextBox2.Text)[code]............

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