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
End If

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

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


Passing Null Object() ByRef Returns Initialized Object()?

Dec 8, 2009

I am making use of a 3rd party dll and am encountering some strange behavior in VB, which doesn't occur in C# Perhaps someone can explain what is going on. Anyhow, I am making use of a method in this 3rd party library which accepts an array parameter ByRef. The end result is the variable should remain null after the method call, but it is returning initialized for some reason.


View 2 Replies View Related - Checking For A Session Variable... Returns (Object Reference Not Set To An Instance Of An Object)

Jan 12, 2011

In the Session_Start of the Global.asax i have

Sub Session_Start(ByVal sender As Object, ByVal e As EventArgs)
Session("login") = False


Why i am getting error the error Object reference not set to an instance of an object. at line

If Current.Session("login") Is Nothing Then

while checking for the login state as follows?

If GetLogin = False Then
'Do something
End if

I mean i have already created the instance on the Session_Start... Haven't i?

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VS 02/03 - System.Null ReferenceException: Object Reference Not Set To Instance Of Object

Dec 14, 2010

Currently working on the status bar for application. I would like the status bar to display message errors if a user makes an invalid entry. I have a module which contains the main procedure and procedures to change the text property of my status bar. A Call is made to the procedures from one of the forms that requires the user input. The application compliles but I get an unhandled exception of type 'System.Null ReferenceException' Object reference not set to an instance of an object. [Code]

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Check If Function Returns A Null Value?

Apr 2, 2011

i hav two openfilefialogs(1 and 2). So i also have a listbox. the files opened with the openfiledialogs will be added to the listbox. and when i need to open the files i need to see if they are from which openfiledialog. so

it is like this.

Path.GetDirectoryName(OpenFileDialog1.FileName) & "" & Form3.ListBox1.SelectedItem.ToString
'if this returns a null then go to this
Path.GetDirectoryName(OpenFileDialog2.FileName) & "" & Form3.ListBox1.SelectedItem.ToString

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Sep 26, 2010

Use the "new" keyword to create an object instance & Check to determine if the object is null before calling the method. I'm reading text from a text file using the following [Code]

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Object Null Reference Exception?

Feb 10, 2010

write know i am gettin null reference exception due to followin code
Imports System.Xml
Imports System.IO


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Apr 13, 2012

I have a WPF application that uses a third-party library to perform a specific task; this library, in one of its methods, executes the statement Assembly.GetEntryAssembly(). If I run the WPF application on debug (by running a .Net exe for testing) the library works properly and Assembly.GetEntryAssembly() returns a reference to the assembly of the executable, but in production I have a different situation that causes me some problems.


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Dataset Returns Null Value

Mar 1, 2010

I have the following code in my application. When it is executed it brings out a null value at times, where i am sure there should be a value returned. I have checked by running the sql statement in the database and it returns the correct value. What could be wrong with my code? [Code]

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File In Returns Null

Oct 27, 2010

Rather interesting bit on this one, I have all the code where it should be working but whenever it hits parse1 it returns the file as null. [code] I probably just need a fresh pair of eyes because I'm not seeing where this is glitching (...or if it's just my computer in this case.)Rather annoying at this point, tried break points and following the execution to catch the error but no such luck.

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Check To See If Object Is Null

Jun 29, 2009

I just want to check and see if this object is null. if i do not and it is my applications closes.I have also looked into a null reference exception. I will do whatever as long as it handles "null".[code]

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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


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Session Showing Object Reference To Null Exception

May 31, 2012

I have a VB.NET application which runs perfectly with local host. But when I upload it to my server the session objects throw null reference exception.

Sessions is not working in a single page. If I use session on any other page it is working perfectly.

I have enabled session in that page using the EnableSessionState property. Also in web.config I enabled the use of session variables.

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Nov 21, 2009

I have some VB.NET code that creates a TransactionScope instance:

LoggingUtility.LogDebug("UpdateCallTable", "SatComCallDataImporter", "About to associate call data with contracts")
Using ts = New TransactionScope()
LoggingUtility.LogDebug("UpdateCallTable", "SatComCallDataImporter", "Getting all unimported SatCom calls")

My application is throwing an exception on the call to the creation of a new TransactionScope, with "Object reference not set to an instance of an object.". The exception isn't thrown on my development machine or my test machine; only on the customers production machine, and I have no idea why. I've placed debug lines immediately before and after this line so I'm positive it is this line causing the problem.

A have used TransactionScopes throughout the application and this is the only place throwing the exception on the client machine."About to associate call data with contracts" gets written to the log and the next log entry is the "Object reference not set to an instance of an object".

Code works fine if I move it out of a transaction.I've been struggling with this for 4 days now and have got no closer.

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Database Call Returns Null?

Jul 22, 2009

Is their a more elegant way to assign a space to a value, if a database call returns null for a data set column? I am doing the following check which is pretty tedious:

If (ds.Tables("employee").Rows(0).Item("txtNamePrefix").IsDBNull(0)) Then
txtNamePrefix.Text = ""
txtNamePrefix.Text = ds.Tables("employee").Rows(0).Item("txtNamePrefix")
End If

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Oct 5, 2011

I have a DataGridView connected to a DataSet. I want to allow the user to update and insert new records on the RowLeave and CellLeave events. The Update method works:

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OpenSubKey Returns Null With No Warning

Oct 18, 2011

I am basically trying to access the CLSID portion of the registry... some CLSIDs are working, some arent...

Here is my code:
Dim regkey As RegistryKey
regkey = Registry.ClassesRoot.OpenSubKey("CLSID" & location & "InprocServer32", False) 'Just Returns null when im looking for a certain CLSID
Dim SubKeyvalues() As String = regkey.GetValueNames()
Dim subkeyvalue As String
subkeyvalue = regkey.GetValue(SubKeyvalues(0))

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Selectedvalue Method Returns Null String

Jun 29, 2011

I'm converting a system of numerous programs from foxpro/foxweb/javascript to server.

I'm coding for a dropdownlist which is currently controlled via js.

I don't like using the control this particular way, but I want to maintain look and feel for the customer.

The control is initialized with some values via Page_Load() in behind code.[code]...

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Silverlight Service Callback Returns Null

May 31, 2012

I'm trying to get data with the methods below and I get null response and can't figure out why. I'm just trying out a different way of using a wcf service from silverlight and I don't understand something that I should.[code]...

The employee object will stay null. If I put a break into the service call and follow through the code it finds the correct record from the database and the return statement shows an object with the correct data but still the employee object in silverlight side will remain null.

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VS 2010 String.Length() Returns Null

Jun 11, 2011


By my logic, this should only assign .length to index IF the length of strItem is longer than 0. This check is there in case the listbox is empty, or the user has not selected an item. However, everytime I go through this code without an item selected I get:


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When A Check Box Is Clicked. It Gives An Error "Object Reference Not Set To A Instance Of An Object"?

Nov 2, 2009

I am having trouble with this piece of code. This is an event when a check box is clicked. It gives me an error "Object Reference Not Set To a Instance Of An Object"I am gathering that something here needs to be AS NEW something but I have tried a few things and can not get it straight.

If Me.ckbDefault.Checked = True Then
Dim current_indexno As Integer
current_indexno = Nothing[code]....

View 1 Replies View Related - Request Function Returns Null In Firefox/Chrome?

Apr 25, 2011

I have a several form elements that I am dynamically creating with javascript when a user changes a number value in a textbox, by filling the innerHTML of a div like so:

dfinnerhtml = dfinnerhtml + "<div class='field'> ";
dfinnerhtml = dfinnerhtml + "<textarea name='textbox1" + suffix + "' type='text' id='textbox1" + suffix + "' value='' rows='4' cols='20' class='field'></textarea> ";
dfinnerhtml = dfinnerhtml + "</div> ";

Then, in the aspx.vb code behind, when the user clicks the Save button, I run through a series of Requests to try and add the values that are in these form elements to a SQL string:

Dim DFTestValue1 As String DFTestValue1 = Request("textbox" & c.ToString)

where c is a loop counter to the # of textboxes created (the input value mentioned above that triggers the create) The problem here is that this code works in Internet Explorer but not in Firefox or Chrome. The Request() value returns null and nothing is saved. I hope I've explained this well enough.

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SelectedText Of A Combobox Returns Null In Windows Form?

May 18, 2010

I tried binding data to combobox at the runtime in the form load event. I had written the following bind function,

Private Sub BindComboBox()
Dim da As SqlDataAdapter
Dim conn As SqlConnection
Dim ds As DataSet = Nothing


The problem is cboSubject.SelectedText is returning empty string.

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VS 2010 Reading Excel Returns Some Rows As Null

Oct 25, 2011

I have a app that I can read a .xls file into a dataset or loop through as oledbdatareader and it gives the same result.Some of the rows have all nulls when I loop through them but if I open the same file in Microsoft Excel I can see that row fine.[code]From the info above the first two SKU values would come through fine but when I get to the 3rd row it would show a null.Is it possible that it kind of inherits the first rows type and since the 3rd row isn't all numeric if nulls it? [code]

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Check Object's Property For Null Or Empty String?

Jul 28, 2009

I'm using FileHelper to generate object's property. Here is an example of one property:

<FieldOptional(), _
FieldTrim(TrimMode.Both)> _
<FieldNullValue(GetType(String), " ")> _
Public StoreNo As String

As you can see the StoreNo will either have a value or " ", one of the business policy is to check if the StoreNo is empty or nothing if the object's StoreNo is empty or null then the record will not create.

I though about creating an HasValue Function in the class to check the StoreNo and other properties in the object but I feel like it is a hack.

Public Function HasValue() As Boolean
Dim _HasValue As Boolean = True
If StringHelper.IsNullOrBlank(Me.StoreNo) Then


I don't think this approach is an ideal solution. what if the StoreNo is remove or change to something else. What's the best approach to check object's property?

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Query - Access Db Returns Null After Changing Operating System Date?

May 8, 2012

I have a select statement which was returning the required values but when I changed the OS date from English(US) to English(UK), it now returns null. I believe the problem is concerned with date since in the query am selecting values where the date from the database is the same as the date in a combobox but I don't know what else I can do. It almost looks like the dates in the combox and in the database are not the same and yet the date in the combobox is actually retrieved from the database and has been returning values fine until I changed the system date format.Here's my select command:

cmd4.CommandText = _
"SELECT sum(brought_qtty), recieved_qtty from brought_coffee, centre_weigh where brought_date=#" & _
dtComb.Text.Trim & "#" & _[code].......

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Very Simple Ssis Script Transformation Giving Object Reference Not Set To An Instance Of An Object

Mar 1, 2012

I have an ssis package that takes a flat file and dumps it to SQL. During that process, 150 columns need to have '-' and '.' removed from them. I have done this using a Script Transformation.

Public Overrides Sub Input0_ProcessInputRow(ByVal Row As Input0Buffer)
Dim column As IDTSInputColumn90
Dim rowType As Type = Row.GetType()


Edit I've discovered that this line is the problem

Dim strCol As String = columnValue.GetValue(Row, Nothing).ToString()

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.net - Process.start System.nullreferenceexception: Object Reference Not Set To An Instance Of An Object

Oct 16, 2011

I am trying to start the process with the following parameters When I try to start it though I get an System.nullreferenceexception: Object reference not set to an instance of an object

Dim exepath As String = Application.StartupPath + "inffmpeg.exe"
Dim sr As StreamReader
Dim cmd As String = " -i """ + input + """ -ar 22050 -y """ + output + """"
Dim ffmpegOutput As String


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Error System.NullReferenceException Occurred - Object Reference Not Set To An Instance Of An Object

Jan 12, 2010

i am using 2003 and i am trying to get the number of rows of a dataset from form1 into form2 in order to use it for something else and i am getting the error"System.NullReferenceException occured...Additional information: object reference not set to an instance of an object" code is like this:in form1:Public x as integer= me.dataset.table.rows.count here it gives me the error

in form2:
dim frm as new form1

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Error: System.NullReference Exception: Object Reference Not Set To An Instance Of An Object

Jan 5, 2010

I am getting this error when I try to print my report. Here is my print code.

Private Sub PrintToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles PrintToolStripMenuItem.Click
Dim Print_Dialog As New PrintDialog


Here is my error: System.NullReference Exception: Object reference not set to an instance of an object.

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Line Of Code Is Generating This Error - Object Reference Not Set To An Instance Of An Object?

Aug 14, 2010

with datagridview1

while looping through all the cells

i am trying to allot a cell value to another cell value basing on some conditions
& finally delete one code is as fallows

Dim i, x As Integer
i = 0
x = Me.DataGridView1.Rows.Count[code]....

error i am getting is : Object reference not set to an instance of an is extremely surprising for me the same code has worked nice for me but why & how the same line of code is generating this error.

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Object Reference Not Set To An Instance Of An Object When Searching For User In Active Directory?

May 8, 2012

I tryed searching for an user in active directory using the code below but it gives me the error in the title of this post above:

AD = New DirectoryEntry("LDAP://OU=SchoolOUhere,OU=Staff,DC=garrard,DC=ketsds,DC=net", "", "", AuthenticationTypes.Secure)
AD2 = New DirectoryEntry("LDAP://OU=_Groups,OU=Staff,DC=garrard,DC=ketsds,DC=net", "", "", AuthenticationTypes.Secure)


Once you eliminate the impossible, whatever remains, no matter how improbable, must be the truth. - "Sherlock holmes" "speak softly and carry a big stick" - theodore roosevelt. Fear leads to anger, anger leads to hate, hate leads to[URL]...

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Object Reference Not Set To An Instance Of An Object With A Class With An Array Of Classes As A Member?

Aug 6, 2010

Here is the structure that I have:

Friend Class StandardFormatFile
Friend fileType As String
Friend numberOfSeries As Integer


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Mar 14, 2010

The issue is when I try to add a new item to the ArrayList with the following code, it gives me an error:

vb Private Sub btnLabelAdd_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnLabelAdd.Click
Dim result As String = InputBox("New Filter Label:", "Label List")


Object reference not set to an instance of an object.

I'm not really sure what I'm supposed to be doing with this. It's a new setting I just added and it's empty, so I'm not sure if that has anything to do with it or not. Anyone know what's going on and what needs to be done to get it to accept a value and not want to be "initialized"?

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VS 2008 Error - System.NullReferenceException: Object Reference Not Sent To An Instance Of An Object

Oct 23, 2009

I have recently gotten my hands on a free, open-source IMAP connection API.So far, I have been successful in creating a connection to one of my accounts.Where I'm getting stuck is retrieving folders and/or emails from those folders.Does there happen to be anyone here that is familiar with this API, or even Gmail (particularly the folder structure for IMAP)?

If not, here is a link to the DLL that is listed on sourceforge and the company's website that created it (if you feel like testing):

Sourceforge - Koolwired API

I have created a test account so feel free to use the code below without worrying about username/password issues; I'll just delete it when I'm done with it.Here is the code I have made so far for making a connection:

Dim gSession As New Koolwired.Imap.ImapConnect("", 993, True)
Dim gAuthenticate As New Koolwired.Imap.ImapAuthenticate(gSession, "", "imap_test")


When I run that code, I get an error that states:System.NullReferenceException: Object reference not sent to an instance of an object. (The bold line in the above code).

Now, I'm not sure exactly what that means. Does that mean it tried to access the server and "INBOX" doesn't exist so it gets returned a NULL value? Or is it possibly the coding itself?Maybe the Gmail folder system is weird due to the fact they use labels (even though from what I have read online, the labels act as the folders in the IMAP system).

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Failure To Create Data Controls To Access Database Object Reference Not Set To An Instance Of An Object?

May 3, 2011

I was create Access database with Access 2003. I create VB project with Visual Studio 2005 Standard With connection wizzard I create coonect with this Access database, select all tablesI see this database inside Data sources and inside Server explorer Test connection is OK When I drag and drop table from Data sources, Wizzard don't create DataGridView, DataSourceBinding etc .. and I see popup window with mesage: Object reference not set to an instance of an object and then "game over"

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Fill_Text Code Throws An Error : System.NullReferenceException:Object Reference Not Set To An Instance Of An Object

Apr 18, 2010

I got the following code from the demo code samples and just changed the textbox names. But it throws an error:

Private Sub Fill_TextBox()
Dim Num As Integer
Dim DSet As DataSet


The error is:

System.NullReferenceException:Object reference not set to an instance of an object.

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Mar 4, 2010

Here is the code for the button click event;

Protected Sub CompetenciesButton_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles CompetenciesButton.Click
Dim con As String = WebConfigurationManager.ConnectionStrings("foo").ToString()


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'Object Reference Not Set To Instance Of An Object' While Creating Pivot In Excel

Jun 23, 2012

I'm trying to create a pivot table by opening an Excel file from my drive.But I'm receiving the error saying "Object reference not set to an instance of an object".[code]

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.net - Getting An ASP.NET Error System.NullReferenceException: Object Reference Not Set To An Instance Of An Object?

Oct 30, 2011

I am completely new to ASP.NET and VB as well as C#. I am trying to add customers to a contact list out of a DB. Then the list can be referenced to call them up. But when I try to run it I get System.NullReferenceException: Object reference not set to an instance of an object. In line 19.

Here is my code:Page 1 is default connects to the database and grabs the contact information and allows me to select the current contact and add them to a listbox on a separate page:

Imports System.Data
Partial Class _Default
Inherits System.Web.UI.Page


The error occurs on line 19 (For Each customerEntry As DictionaryEntry In Customer) in the second set of code from the default2 class.

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