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()"
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]...
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.
View 3 Repliesi 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]....
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.
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.
[code]in this code, do the objects con and cmd get disposed because the return statement is placed before the end using statement.
View 1 RepliesMy 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.
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'."
Invalid usage of Disposed Object - find which object is open or I am trying to access
View 10 RepliesI 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]....
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'.
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?
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].....
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.
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]
View 13 RepliesBy 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]....
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
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]....
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] .....
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]....
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?
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.
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?
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?
I have the following basic code to read a text file from a StreamReader:
Using sr As New StreamReader(FileData)
Dim line As String = String.Empty
Do
'Error occurs on the next line after looping
'past the *last* line in the file...sometimes
line = sr.ReadLine()
'Some code here to parse and process the line
Loop Until (line Is Nothing) OrElse (line = String.Empty)
End Using
I tried changing the Do Loop to Do While Not sr.EndOfStream I tried checking If sr.ReadLine IsNot Nothing and a few other things but I keep getting the Cannot access a disposed object. Object name: 'SslStream' error after all 105 lines have successfully been read and processed. This code has been working for a couple of years, but there seems to be some issue with certain files (recently) that is causing this problem.
I opened the file and I didn't see anything out of the ordinary. No extra blank lines, funny characters or anything of the like. Just a normal file with 105 properly formatted lines. So even know there is something about this file causing the error, I need to obviosly handle this programatically.
What can I do to prevent the sr.ReadLine() line of code from throwing that exception that I have not yet tried?UPDATE Upon reading the last line of the file, the 'EndOfStream' property on the StreamReader goes immdeatly to: EndOfStream: {"Cannot access a disposed object.Object name: 'SslStream'."} It never toggles to 'True'. This makes checking for this condition problematic.
I think I have figured out why this issue only occurs sometimes: if I add in a blank line to the file at the end, none of this ever occurs. It is only when the last line of the file contains data. Still, I should be able to handle this programatically. Telling the vendor supplying the file to always add a blank line at the end should not be the solution.
I want to dynamically call form, but after the form is closed and reopen i got the error "Cannot access a disposed object named "MainForm"". I've been searching about this error and found out that basically i'm trying to access invalid control.
My question is how i can use the object again? I mean closing and opening form is very common thing to do, so it should be able to be accessible trough the run time. To give you better perspective [code]...
I am programming with Access 2007 VB.net in Visual Studio 2010.I am trying to have my VB program read the database, extract the .bmp image, and assign it to a PictureBox on the fly (I am actually creating a Group on the fly and filling it with data from the database that are selected by my query. One of the fields is "image". All of my other fields are successfully transferring from the DB to the group box.) My problem is converting the OLE Object to a picture/image that I can assign to the PictureBox.I am using TableAdapters and queries set up in an .xsd.I have a database with an OLE Object field.Here is a code snipit of my database set up:
Dim ta AsNew dsWhiteboardTableAdapters.MonstersTableAdapter
Dim monsterList AsNewdsWhiteboard.MonstersDataTable
Dim monster AsdsWhiteboard.MonstersRow
[code]....
I have tried several ways of getting the image into my picturebox, all lead to errors.
with datagridview1
while looping through all the cells
i am trying to allot a cell value to another cell value basing on some conditions
& finally delete one column.my code is as fallows
Dim i, x As Integer
i = 0
x = Me.DataGridView1.Rows.Count[code]....
error i am getting is : Object reference not set to an instance of an object.it is extremely surprising for me the same code has worked nice for me but why & how the same line of code is generating this error.
I got the following code from the demo code samples and just changed the textbox names. But it throws an error:
Private Sub Fill_TextBox()
Dim Num As Integer
Dim DSet As DataSet
[code]....
The error is:
System.NullReferenceException:Object reference not set to an instance of an object.