Null Reference Code In My School Project
Jan 15, 2011
I am basically 4 weeks into my first ever programming class and we are working on a project for the game "Hangman". While I have struggled with everything for the past 3 weeks, I have finally cams across something I have no idea how to correct. I am getting a Null.Reference error in the following line of my
If Not strWordToGuess.Contains(strLetterGuessed) Then
Now this code was provided in my project files, it was dated 4/07, I am currently working in VB 8 express, I am thinking this might have something to do with it.
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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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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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Jan 22, 2012
I'm using vb.net and sql server 2000 for developing my application....The problem i'm having is the Null Reference Exception on the Following line of code:
Dim cmd5 As New SqlCommand("select crtns_removed, pieces_removed, scheme from Outgoing_Invoice where invoice_no = '" & Me.ComboBox5.SelectedItem.ToString.Trim & "' And category = '" & Me.ComboBox1.SelectedItem.ToString.Trim & "' and item_name = '" &
[code].....
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Feb 19, 2010
i develop the following code in vs2005, now i just using this module in my new project @ vs 2008..But this error was araised. I cant able to fix this problem...
Private Sub DataAccess()
Dim errHandle As New ErrorHandler
Dim lobjCommon As New eCopsCommonFunctions
[code].....
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Dec 6, 2010
Iam doing a project for school (snake game) Ok here is the code:
[CODE]:................
Snake.image is the head of snake and snake2.image to snake27.image are the rest(body...) So i want create a code that (if snake intersect snake2 to snake27 parts) then timer1.stop I have tryed with:
CODE:
But it doesnt work..
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Jan 11, 2011
I'm wanting to add two forms to my project that will allow me 1) Pull all the current MS Updates installed and list them in a nice looking grid, 2) Pull a list of all the available updates for the machine. I would love for this to work on XP/Vista/7.
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Mar 29, 2010
how can made school project in vb6 and vb.net2008 with full sources code?How can Made School project in Visual Basic 6 or 2008?
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Mar 4, 2011
im working on a school project where i shall show/explain how a remote acess program work and i coded the most but when want to send all listbox items from server to the client and in the client is another listbox where it should be transfered over..[code]
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Jan 27, 2012
I'm trying to make an HTML editor for my school project. color coding the text so if they type <html>, <b>, <body> in any case it'll color code it to turn blue.
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Jun 18, 2012
i would like some help with how to start with my FINAL YEAR project work dubbed "SCHOOL TRACKING SYSTEM" . I am so much lost on how it shoud be like and what to actually do.
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Dec 9, 2009
So I am supposed to be choosing a final project for my visual basic 2008 class. I cannot help but remember an old high school classmate from web design class who made a program that used the speaker built into the motherboard (or whatever makes the start up beep when you turn computer on) to time the beeps to play simple songs. It was very funny and amusing and I was wondering if anyone had seen something similar or knows how to go about making one?
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Mar 15, 2011
So as the message says i believe im having a problem when declaring an array as control. The background:Im doing a school project where a picture is covered by 48 buttons. When a user clicks a button, they are asked a question. If they answer write, the button disappears until the whole image is displayed.
Im using each buttons visible property to hide it. Now that i think about it, i should probably un-enable it after a question is answered correctly.anyway, I keep getting a NullReferenceException when making the visible set to false. Any suggestions would be awesome. I have already created all the buttons and named them Q1-Q48.
[Code]...
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Jun 30, 2011
I am making a calculator for a school project, I want to have it so it looks similar to windows calc ( with one button for each number & only one text box),My code has a few blank spots but so far it is :
Public Class calc
Private Sub Btn1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Btn1.Click
IOBox.Text = IOBox.Text + "1"
End Sub
[code].....
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Mar 25, 2011
I need help writting a Trivia Game for a school project. The teacher wanted us to get used to looking to forums and google for help so he refuses to help us for this particular summative.
What I want to know is.. how to use a streamreader to read questions randomly from a text document located in the debug folder (I have 10 questions all in 1 text file in the debug folder, and the same for all of my answers) how to use a streamreader and split function to read answers from a text document located in the debug folder to a combobox.
[Code]...
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Dec 13, 2009
I move a VB project from school and home on a flash drive. At school drive mounts on E: at home it mounts on F:. I have 4 forms, Form1, Form2, Form3. Form4. Form1 and Form3 have incorrect file paths, it has the E:, but Form 2 and Form4 path change just fine when I move it from school and home.
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May 5, 2010
I am in the process of writing a battleship game for a final project for school. I get what to do for the most part, but need a little jump start for writing the "ships" class. Does anyone have any suggestions?
So far my game starts with a dynamic array of buttons, but as of now they don't do anything. I need to be able to have the user place ships in places and have the computer randomly generate positions.
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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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Jul 19, 2011
Im doin my school project on taking order system(POS) in a restaurant using VISUAL BASIC?the word visual basic is very new for me...i already do some of the coding,this system not using database,just a simple POS system..When i insert y(for yes),msgbox for order_code and order_quantity apear.but when i insert n(no),msgbox for order_code and order_quantity apear again for one time then stop.then msgbox for calc2 pop out but the value isnt right..calc2 also calculate the order_code and order_quantity,the one that apear after i strike no.
[Code]...
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Jun 3, 2010
I am developing a very simple game in visual basic 2008: a roulette. And yet I found problems in develop it.My question is this: I have an image ,containing all the roulette's numbers and I want to associate the spaces of the different numbers to different buttons, so that which time I click in a certain number on the image it dos some action.How can make this association of the different spaces in the image and different buttons?
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Jun 7, 2012
I'm developing application that is plugable. The plugins are loaded via Assembly.LoadFrom(). In my solution I have 4 projects. A WPF, 2 DLL and another DLL that is a plugin for the app. The plugin project references one of the other DLLs. When I build the Solution and run I was getting an error trying to use the plugin dll because it was expecting an older version of the referenced project. I had to clean and rebuild the plugin project to get it to run correctly.
[Code]...
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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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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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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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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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Dec 16, 2010
How do I check for a null object in a subroutine handle?
Private Sub Form1_KeyDown( _
ByVal sender As Object, _
ByVal e As System.Windows.Forms.KeyEventArgs) _
[code]......
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Mar 21, 2011
I have a null reference warning. Dummy code as follows:
Dim poo As IEnumPooTypes
Toilet.GetPooInBowl(poo)
The variable 'Poo' says it may result in an object reference not set error but I cannot use the 'New' keyword with an instance. How do I make the warning go away?
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Jun 27, 2012
visual basic application prompting me a message "Object reference not set to an instance of an object". i have 2 project in one solution. One is developed in c# and other is in vb. i am calling a method of c# project in vb project. the vb code is:[code]when i debug vb project individually it works properly and when i call vb application from c# application, it prompting error. is i missed out any .net framework reference? [code]
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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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Jul 26, 2011
My site has been running fine for sometime now until recently I see in the event viewer a null reference exception in the DNN core:
DotNetNuke.Common.Globals.GetStatus() in
F:BuildsMaintenanceWorkingDirectoryLibraryCommonGlobals.vb:line
1125 at DotNetNuke.Common.Initialize.InitializeApp(HttpApplication
app) in
[code]....
the line 1125 is:
_Status = UpgradeStatus.None
Which is a property of the Globals class and an Enum Also when this happens it doesnt just do it once then sort its self it does it roughly every minute for an hour or so.I made sure all dataprovider.instances are either in a using or a try catch finally or self closing(if the reader is not used)?
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