I've seen so many posts on this but I just don't understand how to fix it.
HTML
Me.txtDeletedItem.Text = objDeleteLog.Name
[b]Me.txtDeleteReason.Text = objDeleteLog.Code.Description[/b]
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I have a somewhat weird problem with a program i'am writing in VB2005. When I debug the program and start 1 backgroundworker (got 8 different backgroundworkers in the program) in VB2005 nothing goes wrong, but when i'm starting 2 or more backgroundworkers I get an NullReferenceException when trying to read from a MySQL database (withing a few minutes in debugging). This error isn't always in the same backgroundworker, but is always in the same block of code in a backgroundworker (1 of 8). I tried different approaches in getting the results I need, for example with read1.HasRows(), but this also didn't workt... the MySQL table doesn't also seem to be the problem.
Line 8 is where I get the error (read1.Read())... This is a snippet from backgroundworker1, but is also randomly happens in the other 8 backgroundworkers as well... When I'am trying to read te content of read1 is says "Nothing" when the error occures...
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I am getting a NullReferenceException was unhandled error when i run my debugging in this part of my code:Dim x As Integer = Val(index.Chars(0))
View 7 RepliesIs there a simple way to convert MP3 to WAV in vb2005?what i would like to do is play MP3 files in vb2005 but first they need to be converted to a byte(memory) wave string before they can be played internally by the program unless someone else built a class or module for this already.
View 2 Replieshow to program VB2005 for use with USB. I have read 2 chapters from "USB complete" and found that it was complicated. Is there an easier way to work with USB in VB2005?
View 2 Repliesi was connect to my *.mdf file
when i use this code to select some data in my database
Dim da As New SqlDataAdapter("Select colums1, sum(colums2) From debts Where debts.colum3 ='somthing' group by somecolums", SQLConnection)
Dim ds As New DataSet("debts")
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change my SQL connection string to work with "sum" and "group by"
I have a text editor that handles .txt and .rtf files. Using the installer, I have associated .txt and .rtf files with my text editor. This can also be done programmatically or using Windows' "open with" dialog and checking "always use the selected program to open this kind of file".The problem is, when I click on a text file and it opens my app, it doesn't load the file. I have searched everywhere I know to look, but can't find a hint of how to do it. I just keep finding code to associate the files with the program (none that work without errors). But, nothing whatsoever to open the app and load the file that was double clicked.
View 2 RepliesThis never happened to me, and the less data one has (usually) the less you can say what happened.I am trying to write a simple query analyser. I randomly receive these kind of crashes:
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The file specified above does not exist. The place where it crashes is wrapped with Try-End Try. Moreover, yes, I have the painting event set up but it should not concern it (or maybe it does?). I have to add that I use visual basic express edition. The error occurs ocasionally - sometimes when I'm lucky nothing happens, and when I'm not then I get this crash.
When I debug a program my IDE simply does not catch System.NullReferenceException - execution continues as if there were nothing wrong.Moreover, when I go to the menu Debug/Exceptions System.NullReferenceException is not even in the list(Common Language Runtime Exceptions).
I manually add it (there is the Add button) and I put a checkmark in the 'Thrown' and 'User unhandled' column - now IDE catches it, but after I re-load the project the situation re-appears - and NullReferenceException is not on the list again. What may be wrong?
Update:No, when I step through the code the execution does not continue but exits the current block of code (sub or function). There were no Try...Catch blocks and there is a message: A System.NullReferenceException occured in MSCorlib.dll... But why doesn't the debugger stop at this line?
How can I get a NullReferenceException in the following scenario?
Dim langs As IEnumerable(Of SomeCustomObject) = //some LINQ query
If langs Is Nothing Then Return Nothing
If langs.Count = 1 Then //NullReferenceException here
What am I missing here? Debug shows that langs is really just a LINQ queryresult without any results...
Okay after searching two listbox's on a form I am trying to put a number as a string in a label setup for that but keep exgetting a NullReferenceexception error on the label. Label being "shippingDataLabel.text".e is my code;
Public Class MainForm
Dim fifteenShipping As Integer = 15
Dim twentyShipping As Integer = 20
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I have a VB.NET solution that I just upgraded. It was originally in .NET 1.1, I upgraded to .NET 2.0 and verified that it would build and run correctly. Then I upgraded from 2.0 to 4.0. It is still building with no errors, but when I try to run I am getting a NullReferenceException in Global.asax.vb. The really weird thing is, the line that is throwing the exception is this:
Dim dt As System.Data.DataTable I am not trying to use the variable, just declare it. Further down a Function is called that returns a DataTable and sets the variable, but I don't even get to that line. It is throwing the NullReferenceException on the Dim line. Has anyone run across this before? Is this some issue with upgrading?
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I did a Rebuild Solution before posting. This is a web application and the only files I see in the bin folder are the dll files I am referencing. I'm not sure what else I should clean up.
vb
Imports System.Windows.Forms.HtmlDocument
Public Class test_vbdotnet
Private Sub runtime()
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I want VB.NET to get access to the innerText and make a if statement out of it. But it always returns error. (see the comments for details.)
This is driving me slighty madder than i usually am. The thing thats bugging me is the EXACT same code works in a test project i did with an sdf database.See my comments in the code
vb Private Sub tbScan_KeyUp(ByVal sender As System.Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles tbScan.KeyUp
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VB
Dimserial As New Processserial.StartInfo.FileName = "adb"serial.StartInfo.Arguments = "get-serialno"serial.StartInfo.UseShellExecute = Falseserial.StartInfo.RedirectStandardOutput =
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I've got a little problem here:
Code:
Dim DirInfo As IO.DirectoryInfo = Nothing
... some code ...
Me.Tag = DirInfo.FullName
In this code, DirInfo.FullName is sometimes null. So I put this code inside a Try Catch. Although it works fine but I see a System.NullReferenceException in Immediate Windows. I just want to prevent it.
So tried:
If DirInfo.FullName IsNot Nothing Then Me.Tag = DirInfo.FullName
If DirInfo.FullName <> Nothing Then Me.Tag = DirInfo.FullName
If DirInfo.FullName <> "" Then Me.Tag = DirInfo.FullName
But I still get this System.NullReferenceException! How should I check DirInfo.FullName so I prevent this exception?
I keep getting a NullReferenceException error on this UNZIP code:
Dim Sh As New Shell
Dim SF As Folder = Sh.NameSpace("C:\test.zip")
Dim DF As Folder = Sh.NameSpace("C:\test")
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i checked to see if i had a test.zip file in my root dir...its there... i have shell32 referenced
Whats the best way to go through all the controls on a form in vb2005? Im writing a program that can edit a string of bytes based on the information on the form. each control is tagged with the hex address it modifies and values it can be, what is the best way to go through all the controls on a form even those controls embedded in other controls?
View 1 RepliesHow to add music in the form (VB2005)
View 3 Repliesi face big problem my Doctor want this code in vb 2005 or Vb6 who can convert to vb2005 and make it run like the c++ version
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I am having trouble coding a 'map editor' with .net. This code works in VB6:
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
For Z As Integer = 1 To 20
For W As Integer = 1 To 20
Tile(Z, W) = 1
TileA(Z, W) = 1
TileB(Z, W) = 0
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i wish if any one can help me in this:i finished from my project and i want now to conver it to an executable file before it can be used or installed in a workstation.
View 1 RepliesI have many projects VB 2005 ... the question is:
How could I open these projects with VB 2010 version?
I'm trying to find out how to Edit/add/read individual subitems in a populated Listview box I seem to be going round and round in circles looking on the "net"
View 6 RepliesI am trying to build a resource file for a website basically jamming all the images into a compressed file that is then unpacked on the output buffers to the client. my question is in vb2005 can a filestream be multi threaded if you know the size of the converted file, ala like a bit torrent and work on pieces of the filestream ( the individual files in this case) and add them to the resource filestream when they are done instead of one at a time?
View 2 RepliesI have created a project in VB2005, and I am using ms access 2003 as the database. I have created a report in ms access and I have also created a macro. I have added the following code to open the macro, but when i click on the button to call the procedure I get the following message:
Dim Adb As New Microsoft.Office.Interop.Access.Application()
Adb.OpenCurrentDatabase("C:program filesSupport DeskAccessdatabase.mdb")
Adb.DoCmd.RunMacro("Macro2")
When I run the code, and I call the procedure to call the Macro, nothing happends, I don't get an error or anything, what a my missing? The macro does exist.
After I finish my project I'll create a setup for it and give it a serial number.But unformatted it could install on many PC.I have heard that I can create a serial number with the number of the motherboard of PC. Is this possible?I was working on accounting program. This program was protected from a steal by a piece insert in the usb of the PC. So the program was working only for a few days if that piece doesn't inserted.
View 7 RepliesI have a SeaI/O 462 module and I can't find the codes to use it with VB2005.
View 1 RepliesHow do I detect a left-to-right and right-to-left scrolling, whether I slide the scrollbar or click on the right or left scroll arrow? I saw that there was a RightToLeft property but I don't know how to use it.
View 2 RepliesI have a datagridview that contains the column "Amount".
I also have a textbox
I want the sum of the column "amount" to appear in the textbox
I have tried the following:VB
dim total as Integer
For Each row As DataGridViewRow In TblBetalingAanMedewerkerDataGridView.Rows
Total += row.Cells("Bedrag").Value
Next
txtTotaalBedrag.Text = Total
I get the message "Cant find column "amount".Parametername: ColumnName
Do you guys have an idea what i am doing wrong????
