Getting Error On Only 1 Computer (out Of Many) When Writing To DB
Jun 8, 2011
I have written a program to track the membership of a local gym that works perfectly on every computer EXCEPT the computer at the gym. I am pulling out my hair trying to figure out what the difference is any why ONLY that machine throws an error.
Background: The program is written in VB.NET (2008) and calls a MS Access db (PROVIDER=Microsoft.Jet.OLEDB.4.0;). The computer in question is a Vista machine that is extremely slow (I think it's a Celeron with 512 RAM).
History: I have tested the exe on a Windows 7 machine in 32bit and 64bit. Tested on a 2000 and 2003 server with 32bit and 64 bit processors. Testes on a Mac running parallels with XP. Tested on machines with Office XP, 2003, 2007 and machines without Office (thinking it was a resource that was missing) Every machine works but the Vista machine.
The error occurs when the program is trying to update an existing table with a new value that is valid. The field is set to text so I know it's not a casting problem. The error message is a general exception that reveals no information. I can continue from the error but it does not complete the change to the db.
One other interesting note is that the database is accessed across the network so multiple people can use the program at the same time. Unfortunately the Vista machine is the "server" and is the home for the db. The other machines are laptops and are not always accessible on the network. If the program and db are local to the laptops then the program works perfectly. If the db is accessed across the network and the program is local to the laptop then the program crashes.
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Jul 13, 2010
I'm having a problem trying to figure out how to write an event to a remote computers event log. I am able to create a new source and create a new eventlog but I am unable to actually write a new event to the log. Here is a snippet of my code...
Private Sub Button5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button5.Click
Dim source As String = "Please provide a source for the event."
Dim eventLogSelectError As String = "Please select and eventlog to write the evnt to."
Dim messageTxtError As String = "Please provide a message for the event."
[code]....
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Jan 6, 2009
I'm not sure what to call this so my search results weren't very helpful. I am writing an XML document that has computer paths and special chars such as '&'. XML does not like them, so I need to find a way to convert them. I looked at Apple's iTunes XML document and they have the following:Actions & Motives = Actions '&' Motives (without the ' ')C:/Documents and Settings/mmulhearn/My Music/iTunes = C:/Documents%20and%20Settings/mmulhearn/My%20Documents/My%20Music/iTunes/
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Sep 25, 2009
writing user info such as user, computer name, date, and time to an acces database using a button click event. Then use a query to check if the user has accepted the aggreement. If the user has accepted the aggreement then call a vb.exe that display the aggrement. I have a login script that runs the vb.exe and uses a button click that records the user info to a csv file, but if the user has already agreed to the policies I do not want it run again.
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Jun 15, 2009
I am trying to Read a text file from vb.net and then write it to microsoft access. The following is the codes that i have written for this project.
However, there are errors stated:
1. error in inserting record
2. Warning 1 Variable 'DoCmd' is used before it has been assigned a value. A null reference exception could result at runtime. C:Documents and Settings�74958XDesktop6jun[updated]6junForm1.vb 63 9 6jun[code]....
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Aug 16, 2009
I try to write some data in a ini file. i can do that first time but second i give me an error[code]...
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Jul 30, 2011
I had one semester of vb.net in college and it was lacking at best. I am trying to write a few lines to a file on my desktop. When i implement the program it will actually find a file in a network share but the concept should be the same. I am basically writing a program to combine multiple csv files into a single file. I have the entire program written except combining the files. this is my code so far. it's incomplete but after i can figure this issue out the rest should be pretty easy. i will later on add parameters and all that fun stuff.
Public Sub writeFirstLine()
fileWriter = New System.IO.StreamWriter("cusersmyusernamedesktopforktruckfile.csv") 'the error happens at this line
[Code]....
I have a file already on my desktop with this name. in the actual program i will have to create it or delete it and all that fun stuff but for simplicity at the moment i just need to find the file.
at the moment it gives me an error that says directory not found. it seems to be looking for a file in the project folder instead of on my desktop. how can i get it to look at my computer instead of the file the project is held in?
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Feb 8, 2011
I am getting an error message when I am attempting to write to an excel worksheet using VB.net 2005
Operation must use an updateable query I have gone thru the S/O search results[URL]..My code is:
[Code]...
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Sep 10, 2011
What i've written opens an Access database and one can read and write into it (on a table called Journal)It does indeed work for newly made Access files. However it doesnt work with a specific Microsoft Access database (again .mdb) which was made with a very old Access, like Access 2000 or something.The error message is: Syntax error in INSERT INTO statement.Inside the zipped file below you will find the source code of the program, along with an access file that the program CAN read, and the one access file that i NEED the program to reed but it cannot!
To see what i mean run the program one, try to add a new line to the database. you get an error!now rename the Journal.mdb to "journal.bak.mdb. And the journal_working.mdb to Journal.mdb try to add a new line to the database again without altering the source code at all. it succeeds now!!
NOTE: the program can READ data from both files. but it CANT write data to the old access file
this is the code:
Dim cb As New OleDb.OleDbCommandBuilder(da)
Dim dsNewRow As DataRow
dsNewRow = ds.Tables("AddressBook").NewRow()
dsNewRow.Item(1) = txtFirstName.Text 'or .Item(1) =
[code]....
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Jan 30, 2011
Application log file have been created to monitor the process and following code has been used to write the log information into text file. For the first time there is no error encountered when the application runs for hours, may be 3 hours i am getting following error "An unhandled exception of type 'System.StackOverflowException' occurred in mscorlib.dll" [code]...
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Nov 28, 2011
I am trying to create a countdown to a date that the user can enter. I think I got most of the code in the button that saves the date. It gets the date the user entered in comboboxes, creates a txt file, then writes all the information to that txt file. I tested it out, but it didn't work. It created the file, but when it tried to write to it, it errored. The error says "The process cannot access the file 'C:Countdown.txt' because it is being used by another process." This is the code.
Dim enteredmonth As String = monthcb.SelectedItem
Dim enteredday As String = daycb.SelectedItem
Dim enteredyear As String = yearcb.SelectedItem
[Code]....
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Mar 29, 2010
Just completed a program, and tested it. It works, and does exactly what its supposed to do, but I continue to get this error: Cannot Write to a closed TextWriter.The code I'm using is below, but the issue here which I'm guessing would be that in my If statement.[code]'Goes on to create a bunch of tabled XML text.I have this code copied throughout each If Then loop. Basically If the text box is blank then the program will close the table and stop writing.I know the problem most probably lies in that its reading that its trying to close the table or stop writing, but the program forces it to continue.
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Jun 13, 2009
"An unhandled exception of type 'System.StackOverflowException' occurred in mscorlib.dll" when writing to registryI write to the registry quite often in my program (Around 10 times every 12 seconds) the error doesnt constantly pop up sometimes it can save 20times and on 21st ill get the above error. How can i fix this. Is it because im saving so often?
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Oct 29, 2010
i am trying to append text to a file. I have tried streamWriter, fileStream, file.writealltext, file.appendalltext every single time i get an error "Object reference not set to an instance of an object" the path is correct and when i use file.exists it says it exists?
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Aug 30, 2011
For testing purposes, I write a lot of alerts and error messages into a .txt file (some 15 entries per second). At the end of the day, the txt file becomes very large. I am now getting confronted with data loss in my application (threads indicated as being busy). Could it be that my entries in the Log.txt are slowing down my application to the point that the latter becomes unstable ?
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Feb 24, 2009
I have create a vb.net app that creates an excel spreadsheet. When I deployed the app, to the shared drive, I have no problems but the user gets the below error. The user can create the spreadsheet but gets the error when writing. When the user logs onto my PC, the user does not get the error. When I log onto the users PC, I got the error. Application attempted to perform an operation not allowed by the security policy To grant the application the required permission, cintact your local system adminsitrator, or use the Microsoft .net framework
request for the permission type 'System.security.permissions.securitypermissions mscorlib
version 2.0.0.0 culture =neutral
Publickeytoken='b77a5c56193e089'
I have tried to use caspol but it doesn't help?
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Apr 19, 2010
I have written the following Sub in moduleFunctions to call in any form. But it gives an error: "Name 'txtVNO' is not declared" & "Name 'txtVNM' is not declared"
Public Sub txt_Clear()
txtVNO.Text = ""
txtVNM.Text = ""
End Sub
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Aug 18, 2010
I am writing an app in VB2010. My code parses a text file, assigns data to variables My??, and then attempts to store this data in an access 2010 (actually access 2007 format) table. Yet, whenever my code gets to MyRow.Item("Artist") = MyArtist I get an error 5 'Artist' does not belong to Table MyTable, but the field/column does exist in the table as do all the others.
01Dim tbl As DataTable = New DataTable(MyTable)
02tbl.Rows.Add()
03Dim lastRow As Integer = tbl.Rows.Count - 1
[Code].....
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May 12, 2011
I use the following code to write to a Foxpro DBF. The SQL table I am reading from has 9500 rows. When I loop through the following code, I get an error after about 940 rows. There is nothing wrong with the SQL data. The message I get is 'Variable Q940P65 is not found'
Public g_OLEDB_ConnectionString As String = "Provider=vfpoledb;Data Source=N:;Collating Sequence=machine;"
dim strSQL as string = "INSERT INTO STATEUSR(DATEFIELD, STATECODE, MINAMOUNT) VALUES(?,?,?)"
[Code]....
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Dec 3, 2010
i'm trying to upload an image from a vb form with theMy.Computer.Network.UploadFile, but the system responde me with error 404.Here is the code i'm using.Dim siteUri As New Uri("http://localhost:80/users/user_6/prova.jpg")Dim localuri As String = "D:calendariSonia.jpg"
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Jul 28, 2011
I have someone who downloaded my program using click-once. My program allows user to read a .txt file and then manipulate data The user selects the file to open by goin gto File>Open on menu strip
I have a user who gets an error message upon clicking on File Open
It doesnt open up the OpenFileDialog return ans unhandled exception
Method not found System Windows.Forms OpenFileDialog get_SafeFileName
Anyone have an idea what i should be looking at I cant re-create it on my end
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Oct 16, 2010
I am trying to make a program in Visual Basic 2008 Express edition which have a textbox where the user can write information to search for in a simple database stored in the program-code.
What I would like is that when the user types a word, a string variable connected to that textbox.text will be treated as a string. BUT if the user types a number in the textbox, the textbox.text will be treated as an integer (for example a "Double")
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Feb 2, 2012
I'm trying to write a user defined filepath to my app.config file. When i enter c: as the filepath it writes it to my xml file but adds and extra /
Im not too sure why its happening? i have all the correct custom actions set up and my install method is as follows:
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May 3, 2011
I would like to delete a computer from my AD with VB.Net I Get a snippet on the forum but unfortunately I get this error:
Message = "Access is denied. (Exception from HRESULT: 0x80070005 (E_ACCESSDENIED))"
I look for advices in forums... and msdn, i could be an Authentication issue I should use NT AUTHORITYSYSTEM, but I don't know how to and if this is my main issu in my code
Sub Main()
Dim entry As New DirectoryEntry("LDAP path")
Dim pcdir As New DirectorySearcher("(&(objectClass=Computer)(objectCategory=Computer)(cn=SAMPC))")
[code]....
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Mar 14, 2012
My client is having 2 application servers (111.222.333.111 & 111.222.333.222) for load balancing. The main link is [URL]. My clients are saying sometimes they can log in and sometimes they cannot log in. This is what I found out:
[Code]...
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Jun 24, 2009
I am writing long text (1K to 2K characters long, plain xml data) into a cell in excel workbook.
The below statement throws COM error Exception from HRESULT: 0x800A03EC
range.set_Value(Type.Missing, data);If I copy paste the same xml manually into excel it just works fine ,but the same does not work progamatically.If I strip the text to something like 100/300 chars it works fine.
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Oct 12, 2008
Here is a code to insert data to DBaccess from textbox. When I write a colon(') in the textbox to add to DB it caused error and show me this Message "Syntax error in string in query expression '''')'
Code:
Dim conn As New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;" _
& "Data Source =" & Application.StartupPath & "Store.mdb ")
Dim cmd As New OleDbCommand
cmd.Connection = conn
'Add text to DB
[Code] .....
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Aug 5, 2009
I dont know why its giving me an error when i run this code...
Code:
Dim xlApp As Excel.Application
Dim xlWorkBook As Excel.Workbook
[code]......
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Feb 10, 2009
It is working with vb6 but when I used vb.net 2008 it is not working
Private Declare Function GetComputerName Lib "kernel32" _
Alias "GetComputerNameA" (ByVal lpBuffer As String, ByVal nSize As _
Long) As Long
Public Function ComputerName() As String
Dim sBuffer As String
[Code] .....
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Mar 5, 2010
i have developed a small application and was working fine on developing machine but when i installed it on another computer and double click on it to start it starts and after splash screen it gives don't send error [an error occurred] and getting closed.
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