C# - Closing And Disposing A Locally Declared Streamwriter - But Still Getting File Use By Another Process Exception
Dec 20, 2011
Am trying to achieve a couple of things: merge a bunch of individual text files into a combined file, move the files that were combined into a new folder. I have assigned each of these tasks to a method. Something in the first method is hanging on to the file, even though I am closing and disposing the stream reader - but I can't figure out what. I know that a process from the first method is hanging on to the file because when I comment out the first method, the second method moves the files without a problem.
EDIT The first method is returning a value for new big file. This is passed as a parameter to the second method. When the second method tries to reference this file, that is when the program throws the error (5th line from bottom) Most posts on SO advise closing/disposing IO objects, but I am already doing that. They also advise using a third party tool to investigate what process is hanging on to a file, but I already know that it is the first merge method (because when it is commented out the program runs).
[Code]....
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Mar 6, 2009
I am trying to get a subset of locally declared methods in a webform code behind using GetMethods but cannot figure out the proper BindingFlags settings (see code below)....and some further specific questions:
1) Is it possible to differentiate between Procedures and Functions?
2) Furthermore, I only want to fetch a certain subset of these....is there some way I can decorate the ones I want with an attribute, and then further filter based on that?
Private Sub LoadFunctions()
Dim thisClass As Type = Me.GetType
For Each method As MethodInfo In thisClass.GetMethods(BindingFlags.Instance Or BindingFlags.Public Or BindingFlags.DeclaredOnly)
[code]....
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Aug 22, 2010
I tried to put the mso and msg objects into USING clauses - but they don't have idisposable methods so that doesn't work.
Dim mso As New Outlook.Application
Dim msg As Outlook.MailItem = Nothing
Dim body As String
[code]....
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May 3, 2010
Form1 is a mdi container. It has a bunch of forms that can load inside of it as mdi children. If I close each open form inside the form1, and then click the red X at the top right, application exits fine.If I click the red X without closing the forms inside I get: An unhandled exception of type 'System.CannotUnloadAppDomainException' occurred in mscorlib.dll
Additional information: Error while unloading appdomain. (Exception from HRESULT: 0x80131015) However I can break from it. How do I get the application to not show that error? What must I do to fix those inside forms or close when the red x is clicked?
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Jul 8, 2009
So i want these If statements to first see if discharge date has value and admit is null to do this ... and inorder to do this i have to open my other SQL reader which is dr1. becuase at this time i have dr2. open. How do i get around this since i cant read from two stream writer at the same time.
If dr2.Item("DischargeDateTime").ToString <> "" And dr2.Item("AdmitDateTime").ToString = "" Then
'patien is showing a dishcharge dat but NO Admit date
[Code]....
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Jun 4, 2010
I'm building an application in VS2008 (VB) and SQL 2005. I'm using databindings to bind controls to LINQtoSQL objects. If I bind a 'third level' property that can be null I get "Value cannot be null. Parameter name: component" error while disposing the control.
Steps to reproduce (8):
1- create TEST database in SQL
2- create tables like this:
USE [TEST]
GO
/****** Object: Table [dbo].[Table03] Script Date: 06/04/2010 12:26:44 ******/
SET ANSI_NULLS ON
[Code].....
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Aug 6, 2009
There to all gurus,I'm trying to build an Excel generation aplication using VS 2008 and Microsoft Excel 2003, but some how the Excel process that i create it's stuck in the computers memory, and it's only removed when I END the VB Application.
[Code]...
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Sep 17, 2009
I remove the datagridviewcomboboxcolumn from the datagridview and dispose it. When I go to dispose of the datatable that is the datasource to the comboboxcolumn an ArgumentOutOfRangeException is thrown from the datagridview. Apparently the datagridview is still handling events for datagridviewcomboboxcells for comoboboxcolumns that have been removed from the datagridview.
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Feb 22, 2012
I'm reading a file and then closing it with the following code, but my problem is later when I start a batch process it says the file is still in use. Am I doing something wrong in closing it? The process was working fine prior to my adding this code to read the file.
[code]...
This rexx exec is trying to write to the file that I read from in the prior step before creating a PowerPoint presentation, but fails becuase of the lock.I'm at a loss. I should qualify and say the process actually starts, but fails in the rexxexec after it starts, it isn't failing on the process start the rexx exec issues a message that it can't write to the file becuase it is in use.
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Sep 7, 2011
When it comes to database connections what is the difference between closing a connection & disposing a connection? I'm hoping to gain a more technical understanding of what happens when each is called & the effect on the database.
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Dec 9, 2010
In VB.NET or C#, I'm trying to read the contents of a text file that is in use by another program (that's the point, actually, I can't stop the program or it stops writing to the text file, and I want to periodically read out what is currently in the text file in another program)[code]in VB the code is above (a C# answer would be fine as well), however, it still throws the IO exception "The process cannot access the file 'file.txt' because it is being used by another process." Are there any workarounds in this scenario?
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Jun 12, 2011
I am writing a program that creates a file and attaches it to an email. I use a loop to create the attachment, send the email and then do it again with different information in the attachment. This works well for one tim through the loop, but on the second time through I get an error when I try to open the file for output to create the new version of the file. I get an unhandled exception of "The process cannot access the file 'c:ProjectArticles1Article.txt' because it is being used by another process.". How can I release the file from being used once the email has been sent?
[Code]...
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Dec 15, 2011
I'm trying to build a program updater based around downloading XML files from a server. The idea being that the servers XML file contains the current version number and installer location. the updater either gets dumped in the startup folder or gets installed as a service, etc. The program successfully reads and parses the current version xml file and it successfully downloads the xml file from the server.
However when I try to parse the newly downloaded file from the server I get the error:
'IOException was unhandled'
'The process cannot access the file 'C:Program Files (x86)TestServerVersion.xml' because it is being used by another process.'
The code is as follows with the error marked by a comment on line 52:
Imports System.IO
Imports System.Xml.XmlTextReader
Imports System.Net
Module Module1
[Code] .....
It's still work in progress but there's not much point in writing code to download and execute the installer if I can't work out the location of the new version. In case it's of use here is the XML:
<?xml version="1.0" encoding="UTF-8"?>
<VersionConfig>
<AvailableVersion>2.0.0.0</AvailableVersion>
<ApplicationUrl>http://192.168.2.226/EPI/2.0.0.0/</ApplicationUrl>
</VersionConfig>
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Sep 3, 2009
I'm trying to clean-up after an exception, and I'm not sure how to handle a StreamWriter.[code]If somethingBad1 throws an exception, I don't need to do anything to sw; however, if somathignBad2 happens, sw has already been created and I need to close it. But How do I know if sw has been created or not?
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Jul 17, 2011
My.Computer.FileSystem.Rename(pathname,name) < < Throws the above exception I am trying to rename a small .jpg image, - previously (in this application program flow) accessed by the following:
btmp = New Bitmap(pathname) < < , and was followed by a btmp.Dispose well before the Rename called it. Plenty of time had gone by. But for some reason the "application process" is not releasing the pathname for me to rename or delete it.
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May 20, 2012
I have been searching throughout the forums and have yet to find an answer that will work for resolving the above problem in my program The exception is occurring within the declaration of a new streamwriter and after the closing of a previously used streamreader that accessed the same file I'm trying to write to. I think that the file is completely closed at the end of the streamreader block, but I cannot tell for sure.
This bit of code is the block just before the streamwriter declaration and the declaration itself:
Dim fn As Integer = 1 'first number for searching for file
[Code]...
If you need more info or more code chunks to help solve the problem, feel free to ask
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Nov 7, 2011
Im trying to simply load a webpage in a wpf app using
Process.start("www.google.com")The problem is... it is saying "Process has not been declared. It may be inaccesible due to its protection level"
[Code]...
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Oct 19, 2011
I am inheriting my class from a form that has a handler for FormClosing (it's overridable so I can override it and do MsgBox("Ha") there before calling the base method). In my Shared Sub New() I have:
' Add the event handler for handling UI thread exceptions to the event.
AddHandler Application.ThreadException, AddressOf Application_ThreadException
' Add the event handler for handling non-UI thread exceptions to the event.
AddHandler AppDomain.CurrentDomain.UnhandledException, AddressOf CurrentDomain_UnhandledException
'For Console applications you should use the System.AppDomain.UnhandledException event
AddHandler Thread.GetDomain().UnhandledException, AddressOf CurrentDomain_UnhandledException
If I throw an exception in my form outside of a try/catch I am noticing two different behaviors: If I am using the VS debugger I get an unhandled exception and it seems that my unhandled exception handler is called. The formClosing event handler does not seem to be called. If I am NOT using the VS debugger then the FormClosing Handler is being called but the Unhandled Exception handler isn't called. Ideally I would like (in both cases) to have the Unhandled Exception to be called and then the FormClosing event handler to be called.
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Aug 17, 2009
I have a background thread that sits waiting for new clients to connect to my TcpListener and when a new client connects it passes it off onto another worker thread and then loops straight back to waiting for another client. Like so:
[Code]...
Obviously I could just handle the exception and ignore it but I'm sure there must be a more proper way of doing it. One thing I am thinking of trying is using the BeginAcceptTcpClient and EndAcceptTcpClient methods but for one thing I'm not sure if that will actually help and for another thing the Begin and End versions of methods have always confused me in the past... I mean for a start how do you know when to call End?
I figured this must be a fairly common problem but searching the forum only turned up one result and it wasnt any use. I'll keep playing around and trawling google but just wondered if anyone had come across this before?
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Mar 6, 2010
Hi guys. Our application got this exception after it was closed... I was wondering how we can solve this...
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Apr 10, 2012
I have a simple form that when filled out with a case # will return the name of the person that is handling the case. I am getting an error on any machine that does not have VS 2010 installed on it. The error is when ever the user uses the close button (the red X) at the top right of the form the following error is generated:
System.InvalidOperationException: Collection was modified; enumeration operation may not execute.
at System.ThrowHelper.ThrowInvalidOperationException(ExceptionResource resource)
[code].....
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Apr 20, 2011
I am working on a .NET console app which needs to clean up resources on exit. The problem I'm running into is that I don't get any notification if the cmd parent is closed via the console window [X], via Task Manager/Process Explorer or programmatically with WM_CLOSE. I can live with not being able to handle Kill Process from Task Mgr. or ProcExp. WM_CLOSE of the parent console is the most likely way that this application will be closed before it's finished processing.
Here are the events I've tried to register for so far:
AppDomain.CurrentDomain.ProcessExit += CurrentDomainProcessExit;
AppDomain.CurrentDomain.UnhandledException += CurrentDomainUnhandledException;
Console.CancelKeyPress += ConsoleCancelKeyPress;
Application.ApplicationExit += ApplicationApplicationExit;
[Code] .....
These events fire properly when I send a CTRL+C from the console or the application finishes uninterrupted. But none of them fire when the parent app (cmd console) is closed. (The parent/grandparent processes aren't CLR so I'm not sure I would ever receive those Disposed/Exited events. Those are just shots in the dark.) I've looked at some pInvoke stuff but I would rather not go down that road if .NET is an option. Is there a way to detect and handle a shutdown in these situations? I am open to any .NET, pInvoke/Win32/C/C++ solution. (Basically any way it can be done on the Windows platform.). I'm still working with .NET 2.0 so I can't use anything introduced in .NET 3.0+
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Aug 6, 2009
I'm using CreateObject(progId) in Vb to create a pdfDOcument. But the problem is that after I'm done and closing the document and release, How can I shutdown the process? How can I reference the process and know if it was already open by the user before I Created the object? And how can I kill the process if the process was not running before I created the object (pdfDocument)? Is there better strategies than to use CreateObject()?
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Oct 29, 2011
I am writing an application that needs to be running all the time and I don't want the user to be able to close it. I don't want to hide the process from Task Manager. All I need is that when the user tries to terminate the process, he has to enter a password.
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Apr 29, 2010
I am working on a program and for some reason when I run it as an executable outside of debug mode, if I run the main subroutine of the program, the process remains in memory after being closed. Even though the form is closed/gone, it will be in the process list and I have to ctl-alt-del to remove it. If I exit right after opening the form without doing anything, it closes like normal. I am closing and disposing everything I can think of, and I've never had this problem before. This is how I am exiting, but the problem also occurs if the user "X's" out.
Me.Close()
Application.Exit()
I have a couple web file requests in my program, which is the only thing out of the ordinary (code-wise) for me, don't know if those are the root of the problem. I can't imagine this is the first time this has happened to anyone, but I couldn't find anything helpful with my search terms. Any ideas/common solutions? I can post sections of my code if it will help, but the whole thing is pretty long and I couldn't narrow down any potential problem areas.
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May 23, 2012
Okay so my program opens excel, reads a few cells, and closes excel. But, it does not fully close excel and after multiple runs, I have multiple EXCEL.EXE *32 in my process list. It also asks for a save when it's closing when there are no changes being made, is there any way to avoid this? And how do you get Excel to fully close?
[code...]
The program closes, without asking for a save, gets me the data I need, but remains in the process list.
Using this for my Imports
[code...]
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Apr 21, 2010
I am taking in two html files and creating one out of them. To do this I am opening the first html file and not writing out the closing </body> and </html> tag and opening the second file and not writing out the corresponding opening tags, as well as the <style></style>section. I start a streamwriter, and write the lines out to it, and then close the streamwriter. My problem is that the output file is filled with strange characters. I've tried opening the streamwriter with different character sets as the third parm, but all this does is change the characters to different strange characters.It says charset=windows-1252 at the tops of the input files (and the output files for that matter - since I'm just reading stuff in and writing it out - with the exceptions mentioned above).Questions;First, do you think I am properly approaching appending two .htm files together?Second, how can I eliminate these strange characters.
[code]...
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Feb 23, 2011
I have an MDI form as the app start object.I don't think is related, but in the Form closing event, I check for some condition, and if it's true, I ask for confirmation before closing:
Private Sub FormBackground_FormClosing(ByVal sender As Object, ByVal e As System.Windows.Forms.FormClosingEventArgs) Handles Me.FormClosing
If (e.CloseReason = CloseReason.UserClosing) Then[code].....
So long, everything works fine in my development machine, which runs windows XP.However, when deploying the application in a windows 7 machine, the message box works correctly, showing itself whenever it should, but after the form is closed the application keeps running in the background. This happens whether the form closes directly or asks the user first.I have fixed it putting an End instruction in the FormBackground.FormClosed event, but it doesn't feel good.
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Jan 4, 2012
I'm developing Applications in VB.NET 2008.
I have MDI Parent Form and i'm going load all form as MDI child. Here i'm going to give option to "Close All" toolstripbutton in top of MDI Parent to close All mdi child forms.
Now i would like to check that On click of Close All Toolstripbutton , i have to close all mdi child form but except those form is on process, example, I have opened/Loaded 5 MDI child forms within MDI Parent Form.
Child forms are ( just for example ) ,
1. Customer details Form
2. Item Details Form
3. Import Orders Form
4. Stock Details Form
5. Production Entry Form
Here 3.Import Orders form is importing from Excel with 5000 records and 4. Stock details form exporting to excel.
So now if i click "Close All" button then i have close only Idle form i.e 1,2 and 5 but i should not close 3 and 4 since its on some process.
So Is there any .NET option to check that form in process/idle or do I have to check manually by having any Flags ?
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Jun 10, 2009
how I can get the WebBrowser1 control to display an HTML file stored locally on disk when it launches, similar to a homepage. My attempts have all resulted in failure. I am currently trying the following:
[Code]...
If you need me to supply more information, I am happy to do so.
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