VS 2008 - Null Reference Error

Sep 18, 2009

I am testing a program, and I am getting a null reference error at this line. oParent.Invoke(oParent.cUpdatingSolidWorks, iSolidWorksItem). I have stepped through the program, and all the items are created. A watch window with the three objects all have data in them. I am wondering what would cause this error if the objects exist. [Code]

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[2008] Null Reference Error - Store Values In Arraylist Permanently

Jan 22, 2009

I have a module and form. Module has a structure.

[Code]...

Actually values are not stored in that array list permanently. its storing temporarily and then destroying. i want to store that values in that arraylist permanently.

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XML Null Reference Error?

Jan 4, 2010

Im trying to write code that will insert 'records' into an xml file, but everytime i click the button to make the changes to the XML file, it throws a null reference exception, ive gone through this code must be 100 times and cannot find what needs to be declared as 'new' as i know nodes can't be 'new' and the doc is 'new'

Imports System.Xml
Public Class frmuseradmin

[code]......

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Error - Null Reference Exception Was Unhandled

Dec 14, 2009

Public Class Form1
Dim int As Integer = 0
Dim CustomerTable As New DataTable
Dim instance As New InvalidOperationException()

[code].....

This is the code this exception occurs when i click on the home button of my webbrowser.or i enter any site on the combobox.

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C# - Any Reference To Profilecommon Causes Error Value Cannot Be Null. Parameter Name: Type?

Aug 11, 2010

I have searched for two weeks, every night, exhaustively reading forum threads and trying all suggested solutions no matter how outlandish. Just as is the case with the many many forum threads about this same issue, the site works fine on my development machine. It deploys with no errors. It works from the production server and reads data from the database, but when it attempts to access a profile it crashes with this error.

A number of posts say to check or uncheck an option called "remove app_code.compiled file" but apparently this was a Visual Studio 2005 option. It is nowhere to be found in Visual Studio 2010. A number of posts say to make sure the App_Code.dll is present in my bin directory. It is present. I've deleted the app_code.compile file manually to see if that made any difference. I've changed the target framework from 4.0 to 2.0 and 3.5. I've completely deleted the site in IIS, created a different folder with a different name and redeployed the site with every combination of "allow this precompiled site to be updatable" and "Use fixed naming and single page assemblies".

i've included references to System.Web.Profile and System.Web and System.Web.Profile.ProfileCommon. I've created a new, fresh website targeting .net framework v4.0 and copied that web.config file to my application and recreated my profile entries to ensure that I didn't jack anything up in the config file along the way.

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Error: Null Reference Exception Was Unhandled-object

Jul 8, 2009

i have the following code but when i select button1 i get the following error: Null Reference Exception was unhandled-object reference not set to an instance of an object. - any idea's how to fix it ?i have underlined the line of code that is highlighted when the error occurs

Imports System.Data
Public Class Form1
Dim Ping As Net.NetworkInformation.Ping

[code].....

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WebBrowser Error Before Navigation - Null Reference Exception

Jul 4, 2010

I am getting a "null reference exception" error when I run my application, this error occurs even before the webbrowser has navigated anywhere. Why would I get this error without a webbrowser document complete occurring?

vb
Dim HTML As String = WebBrowser2.Document.Body.InnerHtml.ToString
If HTML.Contains("Submit Comment") Then EnterData() Else NextURL()
End If

I don't understand why I would get this error when I haven't even navigated anywhere? Forgot to say that this code is inside WebBrowser2 document_complete.

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Dynamically Creating Objects - Error: A Null Reference Exception

Apr 13, 2011

I am working on creating an application (game) for a PocketPC with Visual Studio2005 in VB/.NET. I try to dynamically create a (new)button upon clicking a label and assigning certain properties to this button. For this I used below displayed code, but this button does not appear on 'Form1' - which is big enough to display it- but creates an error: A NullReferenceException. Such occurs when you try to reference an object in your code that does not exist, but I think I just did by using'..New..' Who can tell me what is wrong and how to fix this? [Code]

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Error - Null Reference Exception Could Occur At Run Time When The Result Is Used

Apr 28, 2011

Background: I wrote code that will output all the currently logged in User's Active Directory group names. I want the group name (ex: Acomp_user_BIG) via IdentityReference.Translate instead of the current user's SID's (ex: S-1-5-32-544) returned via IdentityReference.Value.

Here is code that I used:

Public ReadOnly Property Groups As IdentityReferenceCollection
Get
Dim irc As IdentityReferenceCollection

[Code].....

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VS 2010 Html Agility Pack Null Reference Error

Jul 23, 2011

I explain what I would do immediately:I have to extract data from a table using html htmlAgility Pack This 'my code that when executed gives me' a reference error.I can not figure out what is wrong, I am more 'I can not do this

a Private Sub Button5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button5.Click
Dim web As New HtmlAgilityPack.HtmlWeb()
Dim doc As New HtmlAgilityPack.HtmlDocument()
doc = web.Load("http://www.mia_pagina")

[Code]...

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Warning Error: A Null Reference Exception Could Result At Runtime

Feb 20, 2012

Due to this error I am getting a default date 1/1/1900. Variable 'dr' and 'dr1' is used before it has been assigned a value. Here's the code:-

[Code]...

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Database Binding And Data Navigation Project Error - Null Reference?

Mar 4, 2012

I am trying not to become intimidated or give up.I created a simple database and added stored procedures to read the data on a Windows form using Visual Basic in VS 2010.First I tried the Data Grid Example and all worked, I was able to view the data using a connection string to call the Stored procedure.I have stepped it up a notch by trying to bind data to form controls and I am getting this error message when I try to navigate through the data.

System.NullReferenceException was unhandled

[code].....

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VS 2008 : ListView ItemSelectedChange Null Reference?

May 4, 2010

I have a ListView populated with colors one can choose to customize the UI a bit. I want the user to be able to click an item in the ListView and have it's BackColor become the BackColor of a picturebox (the "preview"). This is my

VB.NET
Private Sub listColors_ItemSelectionChanged(ByVal sender As System.Object, ByVal e As System.Windows.Forms.ListViewItemSelectionChangedEventArgs) Handles listColors.ItemSelectionChanged
clrPreview.BackColor = listColors.FocusedItem.BackColor
End Sub

If I try to select a different item with one already selected, I get "System.NullReferenceException was unhandled." How can I fix this?

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VS 2008 Public Function Null Reference

Oct 2, 2009

why I am getting a NULL reference error. Form: Public Sub CreateSession() ' This will be the execution function after the date, provider, session type, session number ' and consumers have been entered. Each Consumer will have it's own tabpage and seperate record.

[Code]...

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VS 2008 - Null Reference Exception Could Result At Runtime

Jan 29, 2012

Warnings: Variable 'targetPath' is used before it has been assigned a value. A null reference exception could result at runtime.

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Null Reference Exception In Line Checking For Null?

Dec 15, 2011

I have a fairly simple piece of code:

Private _PurchaseDelivery as PurchaseDelivery
Protected Overrides Sub InsertItem(ByVal index As Integer, ByVal item As PurchaseDeliveryItem)

[Code]....

Which is inside a class which overrides a custom list base. The code is occassionaly throwing an unhandled exception, System.NullReferenceException, on this line when used in production:

If _PurchaseDelivery IsNot Nothing AndAlso _PurchaseDelivery.DefaultSKUBinID.HasValue Then

DeafultSKUBinID is declared as an Integer? (Nullable Int) in the PurchaseDelivery class. I cannot see what might be causing this error, why would this be returning an error?

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VS 2008 - Error : Reference To A Non-shared Member Requires An Object Reference

May 8, 2010

I get this error:Reference to a non-shared member requires an object reference.When i compile on the following code section:

Private Sub statusBarToolStripMenuItem_Click(ByVal sender As Object, ByVal e As EventArgs)
ToolStripMenuItem.Checked = Not ToolStripMenuItem.Checked
statusStrip1.Visible = ToolStripMenuItem.Checked

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Null Reference While Compiling Resourcefiles In A Project Converted From 2008?

Feb 15, 2010

I just tried to convert some of my Projects from VB2008 to VB2010 RC, but got compiling Errors while compiling the resX Files. Seems like the reason are ImageLists/Icons, since if I remove them the files compile fine. I already tried to edit the Forms witch are showing the Errors with the Designer. The Designer changed the Content of the resX file lightly, but the error was still present Here the Error(German Version): 'FormsfrmUserTmpBUTable.resx : error RG0000: Der Objektverweis wurde nicht auf eine Objektinstanz festgelegt.' I recall a similar error in the Beta, but since I can't find it anymore, I guessed it was fixed.

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VS 2008 TreeView Null Reference Exception In Base.load()?

Dec 28, 2009

I've placed a treeview on my form and when debugging everything works as planned. However, when I publish the application and run it on another machine, I get a null reference exception. This form is an MDIchild and another form in the same child collection loads its TreeView data with no problem.Here's my code, MajorCategories(), MiddleCategories(), MinorCategories() are all arrays of Structures filled in an outside subroutine.

Private Sub CategoryMaintenance_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
RedrawTree()

[code].....

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Get The Error "Null Reference Exception Was Unhandled" Before The Loop Ends?

Aug 1, 2011

I tried adding a loop inside this loop but continue to get the error "Null reference exception was unhandled" before the loop ends.

For rowIndex = 0 To dgvVisit.RowCount - 2
MessageBox.Show(dgvVisit.Rows(rowIndex).Cells("CoPayCharge").Value.ToString)
For rowIndex1 = 0 To dgvPayment.RowCount - 2
MessageBox.Show(dgvPayment.Rows(rowIndex).Cells("CoPayPaid").Value.ToString)
Next
Next

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Null Reference Exception Unhandled Error When Input Is Saved Into Array After Array Has Been Erased?

Jun 23, 2011

n my project i am to enter a name and a test mark into two separate text boxes and then select the button to store the information into the arrays, one array for names and another for marks, but when it is reset using the Erase <Array> fuction andi try to re enter information, no matter what information is entered i get a "Null Reference Exception Unhandled" Error.I am using Visual Basic 2008.My code is as it says from now:

Public Class frmAdverageTestMarkCalculator
Dim ClosingMsg As String
Dim Closingtitle As String

[code].....

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Structure Inside Another Structure Receives Null Reference Error?

Jan 5, 2012

Module Module1
Public Structure structure1
Public TRANS() As structure2
End Structure
Public Structure structure2
Public X() As Integer
End Structure
End Module

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Error Null Reference :: VB In Infopath Infopath?

Jan 20, 2012

I am trying to extract a hyperlink using the open file dialog with no success.System.NullReferenceExceptionObject reference not set to an instance of an object.

at DPR_Library_5.FormCode.CTRL177_5_Clicked(Object sender, ClickedEventArgs e) in \srv-na01user
epInfoPathProjectsDPR_Library_Final_1_GetFileFormCode.vb:line 76

[code]....

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VS 2008 Fix ActivationContext Cannot Be Null Error?

Sep 9, 2010

I have built my project successfully but when I run App. I get error message:value cannot be nullParameter name: activationContext

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VB 2008 - Lists And Null Value Exception Error

May 10, 2009

I have one list that pushes to another list. Think of a shopping cart situation. If you double-click on the white area after the list of items in the first window, I get a null exception error when I push the info to the second window. How can I avoid that error??

Existing Code is below...
Private Sub lstBooksAudio_doubleclick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles lstBooksAudio.DoubleClick
If lstBooksAudio.SelectedItem = "" Then
MsgBox("Please Click on an item.")
[Code] .....

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VS 2008 Getting A Null Exception Error Intermittently

Dec 30, 2009

I'm hoping someone can assist. I'm still learning VB so excuse my lack of knowledge. The below code is a mashup of a code snippet I found that effectively reads from an SQLite database. The initial code snippet consisted of a textbox for input, a textbox for output, and also consisted of a datagrid to store the contents and a button to activate the lookup.

[Code]...

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.net - Null Reference But It's Not?

Jun 2, 2010

This is related to my previous question but it is a different problem.I have two classes: Server and Database.

[Code]...

The problem is in the LoadTables in the Server class. When it hits Databases.Add(db) it gives me a NullReference error (Object reference not set). I don't understand how it is getting that, all the objects are set.

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Null Check Always Returns Null, If Removed Returns Object Reference Not Set To An Instance Of An Object

Jun 24, 2010

I have some code which gets child items for a menu via the GetChildren function which takes a list of menuData: Dim builtMenu As New List(Of MenuData)(_rawData.FindAll(Function(item) item.GroupingID = 0))

For Each menuData As MenuData In builtMenu
If menuData.Children IsNot Nothing Then
menuData.Children.AddRange(GetChildren(menuData))
End If
Next

If I check if menudata.children isnot nothing, it always is nothing because the GetChildren function is yet to run (providing the child items, which do exist). If I remove this check and just have this code:

Dim builtMenu As New List(Of MenuData)(_rawData.FindAll(Function(item) item.GroupingID = 0))

For Each menuData As MenuData In builtMenu
menuData.Children.AddRange(GetChildren(menuData))
Next

Then I am presented with a Object reference not set to an instance of an object error on menuData.Children.AddRange(GetChildren(menuData))

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How To Avoid A Null Reference

Jan 8, 2011

I have been trying to use sockets in VB.NET and once I cannot understand how to avoid a null reference. [code] I have tried introducing sock as 'New Socket', but this gives me 'Overload resolution failed because no accessible New can accept this number of arguments'.I also cannot simply add '= Nothing' onto the end of my declaration since this still gives a null reference.

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Null Reference Exceptions

Jan 29, 2011

I'm practicing on this one, and I know it would be better to just use a string variable instead of a class. I have another working program using a string variable, but on this one I wanted to make it use an array of class objects.

I keep getting null reference exceptions at the line where the object is assigned the textbox text.[code...]

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