Error: Mscorlib: The Requested Operation Cannot Be Performed On A File With A User-mapped Section Open
Apr 6, 2012
I've written a VB.NET program for a client that stores all of its data in XML files. I use the XMLReader to read the data into a dataset. When I run the sub to encrypt the XML file, I'll get the following message: Error: mscorlib: The requested operation cannot be performed on a file with a user-mapped section open.
It doesn't happen all the time, so I know it does work. But on occassion, I'll get this message. I've been all over the forums and I've tried everything I've read to try and stop this error.
I close the reader object and set it equal to Nothing. I've even tried using DoEvents to make sure the object finished closing before running the Encrypt sub. Nothing has helped.
I develop on a x32 PC. It works fine on the development machine. But then, when the client runs it on a x64 PC, he gets these errors. Could the x64 system really be running so fast that the .Close() and the = Nothing and evern the .DoEvents() can't keep up?
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Mar 6, 2012
I don't see why this doesn't work. I have gone into the registry and removed the registry key below and still no joy. The error arises at the For Each Loop.
[Code]...
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Apr 1, 2010
i am getting an error called "OledbException was unhandled-operation cannot be performed" when i entered the values in the textboxs and click button3.When i build this code,it is succeeded.but at the runtime when i click button3 after giving the values in the textboxes this error occurs. below is the code i used....
[Code]...
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Jun 3, 2009
I am doing setup project in VS 2008. I used custom action to select file from local drives.On the button click of custom action form, I am launching Open file dialog...asofdGetNetPath.ShowDialogWhen I run the setup on Vista, and click the button to open the openFileDialog, it hanged, form becomes non responsive and I have to cancel the setup.on debugging I got following error"Current thread must be set to single thread apartment (STA) mode before OLE calls can be made. Ensure that your main function has STAThreadAttribute marked in it. This exception is only raised if a debugger is attached to the process."
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Aug 5, 2010
I've using vb.net 2003 and some of the times this error arises. Can anyone know on how this error arises and how to fix it?
Error: The requested clipboard operation failed
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Jan 18, 2010
I have a datagridview on a form which is populated with data from our backend database. A few of my users are experiencing a problem when they select all the cells in the datagridview and try to copy and paste the contents into something such as Excel.
The error is: Requested Clipboard operation did not succeed.
Having searched for information on this error it appears that if a process has the clipboard already open (such as office) this will cause the exception being thrown (which is a system.runtime.interopservices.externalexception), usually when the code calls the clipboard.settext method (which I do not). However my form and its code does not even contain anything to do with clipboard manipulation, copy and paste or anything remotely to do with using the clipboard so I am unsure as how I can actually catch this exception and just report back to the user?
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Mar 15, 2012
I created a SQL DB named MainDB.mdf and a small VB 2010 application with some forms and datasets.Everything was working OK until i got a new computer and re-installed Visual Studio 2010 and SQL server 2010 on it. I copied my DB from the old to the new computer and also copied by VB 2010 project to it. I used Windows Authentication to connect to the DB in the old computer and also in the new one, i am using different Windows user account names though.
I was able to connect to the DB in the new computer in the Server Explorer section, i created a new connection string to the DB and i can seed there is data in the tables. When i run my VB 2010 application created in the old computer get error:
"Cannot open database "MainDB" requested by the login. The login failed. Login failed for user 'D630Admin'."
I need to get rid of that error and be able to add/mod/del data from my DB using my VB application as i used to.
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Jan 14, 2012
I am using the following code to backup my database...
Dim con As SqlConnection
Dim cmd As SqlCommand
con = New SqlConnection("Data Source=.SQLEXPRESS;Initial Catalog=LIC;Trusted_Connection = yes")
[code]...
But I get this error
Cannot open database "LIC" requested by the login. The login failed.Login failed for user 'mono-PCmono'.
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Mar 1, 2011
I got the above error when i deploy my web application into windows server 2003. How do i resolve it? [code]
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Apr 10, 2012
This is a simple fragment of my code:
[Code]...
The last line throws an exception "Cannot open file" with certain end-user profiles. It works perfectly fine when executing from an Admin account. I just cannot figure out what user privileges and access settings may cause the error. Note that it also works with some end-user accounts (not admins). What missing user rights can cause this?
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Apr 22, 2012
When large number of records in Database, it throws error "Operation has been canceled by the user" in vb.net. I want to retrieve records from DB2 and display the records in DataGridView in VB.net. If number of records is less it works fine. But if the database tabe has large number of records it throws error "Operation has been canceled by the user". [code]
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Aug 6, 2002
An unhandled exception of type 'System.IO.IOException' occurred in mscorlib.dll Additional information: The process cannot access the file "c:Fax524b2cfa00.tif" because it is being used by another process.
[Code]....
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Feb 5, 2010
Background info: I have an app that I recently had to upgrade from VB6 to VS2008. It was only an upgrade so there are still some VB6 components in the app.My problem is that I get the following error from one of the forms in my app.
Err Number: 5
Source: mscrolib
Err Decription: Exception has been thrown bt the target of an invocation.My problem is that I don't experience this error during debugging. Out of 20 computers 5 will have this error, the rest will be fine.
The exception occurs when a form is opened that has: The form has an AxMSFlexgrid on it 2 textboxes and a command button. where to look for the problem, or a possible solution.The Problematic installations is running XP SP3 and .NET 3.5 SP1 (installed)
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Dec 8, 2008
I can't open an Access database on a mapped drive. However it works if I use the UNC path. how I can get this to work? See the code below for an example of what works and what doesn't...
Code:
mConnString = "provider=Microsoft.Jet.OLEDB.4.0;Data Source=\tiger-2000dvb_mt7MTrackBE.mdb" ' This works
mConnString = "provider=Microsoft.Jet.OLEDB.4.0;Data Source=T:vb_mt7MTrackBE.mdb" ' this does not work
Dim objConn As New OleDbConnection(mConnString)
[code].....
The error message I receive is...'T:vb_mt7MTrackBE.mdb' is not a valid path. Make sure that the path name is spelled correctly and that you are connected to the server on which the file resides.I've done the obvious and verified that t:vb_mt7MtrackBE.mdb is a valid path.
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Mar 15, 2010
I'm using this class to try and impersonate a user on a remote machine.[code]....
However, it fails when trying to open the registry hive with an "Attempted to perform an unauthorized operation" error.I know the password is correct so can someone tell me what might be going wrong?
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Feb 5, 2010
is there a way to detect if the user is shuting down?
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May 2, 2012
I am creating a custom config section that will allow me to manage what ELMAH exceptions I want to ignore from my VB.NET/ASP.NET app. Here's my code. I made it easy to paste in a blank code file if anyone's up to the challenge of diagnosing the problem.
CODE:
When I execute this code:
CODE:
I get the error An error occurred creating the configuration section handler for IgnoredExceptionSection: Could not load file or assembly 'WEB' or one of its dependencies..
What boggles my mind is that this all works fine in my C# console test app after I convert the code from VB.NET using a web utility. However, when I paste the VB code from my web app into my VB.NET console test app, it doesn't work there, either, so it appears to be a C#/VB issue. What am I doing wrong here?
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Feb 29, 2012
I need to create an application that will restore a user's mapped drives from a database. To do this, I need to create a script that will automatically back up the user's mapped drives on logon.
What would be the best way to go about doing this?
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May 21, 2009
I have created a file watcher but I have a problem with the file watcher.here is the
vb.net
Inherits System.Windows.Forms.Form
Private watchfolder As IO.FileSystemWatcher[code]....
And I have the Following error
InvalidOperationException
"Cross-thread operation not valid: Control 'txtmonitor' accessed from a thread other than the thread it was create on."
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Mar 15, 2010
I have a text string like this which I will need to parse: FriMar1200:00:00EST2010 And I used the following Date.ParseExact("FriMar1200:00:00EST2010", "dddMMMddHH:mm:sszzzyyyy", Nothing) And it is giving me a A first chance exception of type 'System.FormatException' occurred in mscorlib.dll error.
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Nov 16, 2011
I'm trying to fill out a webform where the user gets a image in a picturebox and then enters the requested text.But when i submit it to the forum nothing happens This is the code of the html page:
<input id="response_field" type="text" autocapitalize="off" autocorrect="off" name="response_field" autocomplete="off">
How could i add this: value="test" to the above line while the page is beging generated so its part of the webpage?
My
With WebBrowser1.Document.Forms("form")
.All("response_field").SetAttribute("value", "test")
End With
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Sep 1, 2011
I get this error.. and I know the ip address is not valid duh! but it's a server it should be based on port only.
Error =
Errors at runProxy @ The requested address is not valid in its context
0.0.0.0:7900
[code]....
P.S.> my client I connect to 127.0.0.1 : 7900..I want it to re-route the connection to the txtIP.text : 7900 (txtListeningPort.Text)
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Oct 3, 2007
When ever I try to create a new project, any project using VS2008 B2 running on Vista I get this error. "Requested Registry Access is not allowed." Obvious registry thing bu t would rather not get into and mess with any hives
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May 13, 2009
I'm just starting to learn vb.net and have never worked with cookies. I'm wondering if I can store an array of name value pairs in a cookie, so they can be retrieved by index number. I'm not really even sure if that's the best way to handle the issue. I basically want to have three things: an 'add/delete' page that has a text box for creating new favorites, along with a list of their current favorites, with the ability to individual delete favorites from the list.be able to display their existing favorites from the cookie on a separate page and a button I can put on all my pages for 'add this to favorites'I don't mind doing the research, of course, but really need direction on what will be required. Having never worked with cookies, I don't really know the limitations.
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Jul 9, 2009
I was wondering if its possible for VB to display all available COM ports that are open. he reason that I ask this is because this program will be run on various computers where the COM port will not always be the same. I have a text box now that the user can choose which com number he/she wants but if the wrong one is entered, the program crashes rather than displaying an error message. It would also be nice for the system to show which available com numbers there are
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Aug 11, 2011
I was using the following code to check the file size of a data file on my local machine. Now the data files have been moved to a mapped network drive and this code no longer works. What do I need to change or how do I access file size on a mapped drive?
Dim MyFile As New FileInfo(MyFilePath)
Dim FileSize As Long = MyFile.Length
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May 8, 2012
I'm using Visual Basic Express 2010 and SQL Express 2008 in Windows XP. At first I couldn't add a datasource (the .mdf file for the database) because of a "Operating system error 32" which I seemed to have resolved by giving myself full permissions for .mdf file (by right clicking on the file and going into properties and then Security) and restarting the SQL SERVER (SQLEXPRESS) service. The dataset for the database is in my solution explorer but when I right click on a table adapter to add a query and attempt to open up the query builder, I get the error in the title above.
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Aug 20, 2007
I have a method that allows a user to open a file. The InitialDirectory property is set at the beginning of the method. If the user selects a file in a different folder, the next time the dialog opens, it opens to the last folder used insted of InitialDirectory folder.
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Jan 28, 2012
I need any kind of script that will search through the network drives for a txt file called "Don'tDelete.txt" There is one drive the "U:\" drive and on there is 100 different folders with the "Don'tDelete.txt" file in it. Now every "Don'tDelete.txt" is different. I need the script to find these files, combine them all together into one new txt file locate in the "U:\Newfolder" so later on I can drop the new txt file onto my flash drive.
[Code]...
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Jan 8, 2011
I have a application which reads from ini at startup, What i want is a vb code that will block the user from opening the ini file manually, program could be running as service eg: C:config.ini. program should block the user from opening the file.
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