System.NullReferenceObject Was Unhandled
Jun 4, 2010
recently i created an autoclicker but whenever i debug it and click start,an error pops up : NullReferenceObject was unhandled.then it highlights a code :
Timer1.Enabled = True
well , i dont really understand because when i first made it and tried it it worked . after that i opened it again then there was this error .here's the whole code of the auto clicker .
Public Class Form1
Private Declare Sub mouse_event Lib "user32" (ByVal dwflags As Long, ByVal dx As Long, ByVal dy As Long, ByVal cbuttons As Long, ByVal dwExtraInfo As Long)
[code]....
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Mar 21, 2011
get out from the below loop
Shared Function GetIPAddress() As String
Dim sam As System.Net.IPAddress
Dim sam1 As String
[code]....
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Nov 3, 2009
Here is the code I am working with, everything works fine up until last line then i get evaluate exception unhandled "Cannot perform '=' operation on System.Int32 and System.String." My eyes are going blind trying to figure out whats wrong, if I understand correctly it cant count system string and REO is a string value.
The thing i have done this before ,count that is. I know you cant average strings and some other function but i have been able to count.
d Dim comm As New OleDb.OleDbCommand("Select * From " & Me.OpenFileDialog1.SafeFileName & " Where Status <> 'S'", con)
Dim dalist As New OleDbDataAdapter(comm)
Dim comm1 As New OleDbCommand("SELECT * FROM " & Me.OpenFileDialog1.SafeFileName & " Where Status
[CODE]...
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Feb 19, 2010
When I run my project I get "An unhandled exception of type 'System.StackOverflowException' occurred in System.Windows.Forms.dll"
Public Class frmViewReport
Dim objForm As New frmViewReport
Private Sub frmViewReport_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
objForm.ViewReport("C:a2.rtp", , "@parameter1=test�mter2=10")
[code]....
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May 6, 2009
I keep getting an eroor this error says: An unhandled exception of type 'System.ArgumentOutOfRangeException' occurred in system.windows.forms.dll Additional information: Specified argument was out of the range of valid values.
Option Strict On
Public Class frmWeeklyReport
Inherits System.Windows.Forms.Form
[code].....
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May 6, 2008
I made a program with Visual Basic Express 2008. I got this error message when I try to close my program after running it. (PS: It is a simple code that can login into Microsoft SQL Server)The error message shows the error was caused by the "system.drawing" (Parameter is not valid). Also, I have been trying the code in VBA (Excel). When I tried to close Excel after running my code, I got the same problem (Microsoft Excel has encountered a problem and need to be closed.....) and the error report shows the error was caused by "system.drawing" as well.
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Apr 14, 2011
An unhandled exception of type 'System.StackOverflowException' occurred in System.Windows.Forms.dll it also says make sure you do not have infinate loop or infinate recursion il give all code in order that they are executed in Check the chechbox and it disables all irelevent stuff and populates the combobox
Private Sub CheckBox_Spray_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles CheckBox_Spray.CheckedChanged
If Me.CheckBox_Spray.Checked = True Then
[code]....
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Aug 19, 2010
My app loads a VB DLL, which in turn loads a C++ DLL. My exe and both DLLS are in the bin directory, yet I get the below error when the VB DLL calls the C++ DLL.Why isn't the VB DLL seeing the C++ DLL - it's in the same directory?
System.DllNotFoundException was unhandled
Message=Unable to load DLL 'DS.dll': The specified module could not be found. (Exception from HRESULT: 0x8007007E)
Source=FordNetCom
TypeName=""
[Code]...
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Sep 6, 2008
Code:
System.InvalidOperationException was unhandled
Message="An error occurred creating the form. See Exception.InnerException for details. The
[code].....
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Aug 24, 2006
Yesterday my code was working fine but today this has just appeared.
CODE:
I haven't changed anything in the code at all. The error is generated in the startup forms generated designer code.
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Apr 22, 2009
I am getting a System.OutOfMemoryException was unhandled on my listbox. i dont know how to fix it please help here is the code its saying that to.
CODE:
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Feb 19, 2010
I am working on a code that will import data into excel. Once I add the following piece of code I get aSystem.TypeInitializationException was unhandled error. The program stops and breaks in the form where I call my main (which starts the main as soon as the form opens). Does anyone see why this pice of code would cause this error?
#Region " (Import Data) This function will import the PI Tag Names and desired Attributes into an Excel worksheet "
'Declare Varibles for Data Retrevial
[code]....
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Feb 9, 2012
Private
Sub cmdExit_Click(ByVal
sender As System.Object,
ByVal e
[code]....
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Aug 26, 2011
I have created a vb.net console application when i am running the source code it will work fine.But when i am running the Executable file it is throwing an exeption like "System.TypeInitializationException was unhandled".In my application i have used MCL PrinterMonitorComponent
my code is:
Imports PrinterQueueWatch
Imports SpoolMonitoringIPC
Imports System.Data.SqlClient
[code]....
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Jul 17, 2010
I am working on an application with a friend and I am getting an error.The error says:
System.InvalidOperationException was unhandled
Message=An error occurred creating the form. See Exception.InnerException for details. The error is: The process cannot access the file 'C:UsersAdministratorNotesWebSiteNotes.txt' because it is being used by another process.
Source=Website Notes
[code]....
Now I know why it is throwing this error but nothing I do will stop it from showing up.At the top of our form we have a module that we use to check if a file exists on the computer and if it doesn't then it will create the file.I have tried accessing that module from the form load event but with no luck as it still throws the error.
This is the source:
Imports System.IO
Imports System.Environment
Module CheckFiles
[code]....
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May 10, 2010
at my visual studio class we made a data base program! i was using VB 2008 on a win xp x86 machine i copy the project on a usb stick because i want at home to work on visual aspects! my pc have win 7 x64 and now my project doesnt work! it shows me an error i cant get to the second form from project!here is the error:
System.InvalidOperationException was unhandled
Message="The 'Microsoft.Jet.OLEDB.4.0' provider is not registered on the local machine."
Source="System.Data"
StackTrace:
[code].....
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Jul 16, 2009
I want to search an string in all files on C:.For this I use list = My.Computer.FileSystem.FindInFiles("C:", "Bula Bula", CaseSensitive, SubDirectorys)So when the search come to "c:Documents and Settings" for example I get this error:
System.UnauthorizedAccessException was unhandled
Message="Der Zugriff auf den Pfad "c:Documents and Settings" wurde verweigert."
Source="mscorlib"
[code].....
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Jun 22, 2011
System.NullReferenceException was unhandled
Message=Object reference not set to an instance of an object.
Source=Image Invoice Management
[Code]......
i do understand that the list count is 0 so shouldn't it be declairing Start_Pos = 0
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Nov 28, 2009
I got the error after I added forms from another project into a new project. Theres no error in my code so it doesn't show where the error occurred.. out and explain what this exception means?
[Code]...
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Jan 23, 2012
i have a code that grabs an image from a site, this works fine and it does get the image fine, but every now and again my internet runs slow and it takes a while for the image to pop up thus causing the error:[code]How would i make it display the msgbox if it returns NullReferenceException error ?
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Sep 27, 2011
i have a small problem with my code that only happens every now and again.Im using multi threading on this and every now and again i get this error: System.NullReferenceException was unhandled Message="Object reference not set to an instance of an object."
Some times the program completes perfect with no errors and sometimes i get the above error.When i get the error there is always 1 item left in the list but when it completes perfect no items are left.Again this error does not appear every time, only every now and again. For example i had to run my program like 20 time to get this error, 19 times it worked perfect with no errors and 1 time with this error.
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Feb 15, 2012
i have this code in my btnsave..it can detect conflicts but after that a dialog box saying: An unhandled exception of type 'System.NullReferenceException' occurred in AppointmentSchedulingClient.exe
Additional information: Object reference not set to an instance of an object. and it points to the green one below.
If Val(cbostart.Text) > Val(cboend.Text) Or Val(cbostart.Text) = Val(cboend.Text) Then
MsgBox("Error in time.", MsgBoxStyle.Information, "MESSAGE")
[Code].....
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Feb 1, 2010
i tried getting rid of a few "dim msearch as new" etc. which is what the error msg comes up with. but it just keeps making it worse.[code...]
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May 7, 2010
I am working with Wizard generated dataset. I added this code to a button for update:
transDetailTA.Update(abars.TransactionDetails)
I'm making the changes to a datagridview bound to one of the tables in my dataset and when I make changes and click the update button i receive the following message even though I'm the only one using the DB (I'm working on a laptop):
System.Data.DBConcurrencyException was unhandled
Message="Concurrency violation: the UpdateCommand affected 0 of the expected 1 records."
RowCount=1
[code]....
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Apr 28, 2010
I'm using this code:
[Code]...
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Aug 30, 2010
I wrote this code to upload a file but I get this error
System.InvalidOperationException was unhandled
Message="Het adres voor UploadFile moet een bestandsnaam bevatten."
The address for UploadFile needs to contain a filename.
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Nov 2, 2011
i am developing a windowsService called MyFirstWindowsService. And also i created a setup project for my windows sercive.it installed successfully. But i am unable to start. While starting it shows error like "An unhandled Exception (System.ArgumentException) occured in myFirstWindowsService.exe"
specificaly it tells invalid path "H:".
filestream.Close()
[code]....
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Jun 24, 2009
At first it was when I was trying to output to a text file, I disabled that for testing purposes and now I'm getting it randomly again.. Here is the code that always seems to throw the exceptio:
[Code]...
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Feb 28, 2010
In this screen I want to let the user decide which elements are on shown on a label. When I hit the update button (BDUpdate_Click; see below), it first checks whether the Barcode sample text is empty. Afterwards I want to invole the refresh of the label preview. The strange thing is that the first time it works fine, but when I alter the sample text and hit the button again, I get the Error "System.ArgumentException was unhandled. Parameter is not valid." The error points to the DrawSting function in the LabelPreview_Paint Sub
Dim BarcodeLabelUpdate As Boolean
Private Sub BDUpdate_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BDUpdate.Click
If BDBarcodeSample.Text = "" Then
MsgBox("Please enter a sample text", MsgBoxStyle.Information Or MsgBoxStyle.OkOnly, ProgramTitle)
[code]....
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Feb 5, 2005
why this error comes up it has happened in most of my projects and i don't know how to fix it.An unhandled exception of type 'System.StackOverflowException' occurred in Unknown Module.
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