I am developing a twitter application but getting a null exception. when I searched indeep I found I am not getting any Users array from getTimeLine() Method.My user name and password are correct (The application is actually available on twitter API site.)
View 4 RepliesI am working on a vb windows form application with several connected forms. Its used to manipulate a MySQL database. One of the sub-forms has the following code snippet:
[Code]...
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?
When I put a break point to the last if clause in the sub ("If (backOrder < 0) Then", see below) it runs until the break point, if I put the break point further below, I get the following error:
Cannot insert the value NULL into column 'OrderID', table 'WHM.dbo.OrderDetails'; column does not allow nulls. INSERT fails. The statement has been terminated.
I've discovered first hand that it only happens when prodqty is bigger then qtyOnStock, thus executing the if clause.
The code:
Private Sub NCOSubmit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles NCOSubmit.Click
Dim sqlText As String = ""
[Code]....
I am in the process of developing a messaging framework for a windows application that sends messages to a java application. To be precise when the win app wants to send a message it simply drops the message in a common database table which will be picked up by the java app. The windows application is deployed across 10 application servers (10 instances) over citrix for load balancing.Each instance of the application is capable of sending a message to the java application and each of these messages should have a unique id. From my end I need to make sure every message generated has to carry a unique id so that they can be identified when necessary. All the messages can be cleared every day or two.i am not quite sure about a best method of achieving this. Initially I wanted to create a static method that serves the next available id (incrementing the last id by 1). But this approach willn't guarantee unique number as the application starts only when at least one user is logged on. For e.g .On one server the app starts when a user logs in, he then sends a message and then the application stops when that user logs off. So when a next request for the app comes to that server a new instance will be started.
View 3 RepliesI am trying to create a treeview in VB.net, the data has to be loaded from MSAccess 2010 database. When I try to run this program I get error : Argument Null Exception was unhandled, 'column' argument cannot be null and the program crashes. I have pasted the code as under:
Imports System.Data.OleDb
Public Class frmRating
Private Sub frmRating_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles
[code].....
I want to learn programming techniques so can make both windows and web applications more user-friendly, faster, safer, reliable and easier to deploy.
View 4 RepliesI'm a college student who has a basic-intermediate knowledge in VB.NET, C++, C# and Java. I'm planning to develop an application similar to Microsoft Windows (Windows and Sharing Center ).
The application will able to perform Wireless Detection: scanning the area for available wireless network and presenting them to the user of the software, and then user can decide to which network he/she wants to connect.
[Code]...
I am new to vb.net . I was developing application in c#. Now i am working in vb.net. i have a query in vb.net. How to write compund assignment in vb.net ?
ex :
In C# ,
int a,b,c;
a=10;
b=c=a;
if i did it in vb.net means the value of b is set to false. how do i solve this problem?
I am trying to develop a chat application using Visual Basic 2008. I have referred some articles on the internet like [URL]...rogramming.htm and got the concept of connecting and sending data. But when it comes to real world chat applications, there is user authentication and all that. So I was wondering if it is possible to make my own Windows Live Messenger or Yahoo Messenger!!. I searched web for such a sample or source code, but could not find any. Has anyone here created such an application??
View 2 Repliesi developed a very simple vb.net application and i need a way for every user to verify that they have paid for it. i would like the simplest method possible. it will be an off-line registration. I am actually looking for a way that I can program this easily myself, and am not interested in third part solutions.
View 2 Replieshi, i am developing a windows application in visual basic 2008. when i will install or setup my application to clients' computers, do i have to install the dot net framework 3.5 in every single pc or i can include dot net framework 3.5 in my application.
View 4 RepliesI am developing an application using VB.Net which is a simple executable which is to be run from a network drive of our company servers. Most users can access this executable without issue - others however can open the executable but have no connection to our database (even though when running the executable off a local drive such as C:, the database works no problem).
From some posts I have seen this might be a CAS issue - however our IT department suggest the issue might be down to different version of the .NET Framework being to blame. Firstly, is this the issue? Secondly, how can I develop my application to work with different versions of the .NET Framework? Surely this doesn't mean developing many different executables?
I am developing an multilingual application in vb.net 2008.I had given a combobox for language selection when user select any language like marathi or hindi then all labels are change in the selected language but i am facing problem with textbox if i select any language it takes input from user in english only.I want when user select any language and enter data in textbox then he is able to enter data in the selected language.
View 2 RepliesI have to develop a new application in windows. in which i have to develop following thing but i am not getting how to develop it.I have to develop following are the two points:1)To show the http addresses that are visit by other computers on the wireless network.
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I'm not new in visual basic but I finished a book of visiual basic in 2005. Now I'm planing to be a2z software developer on windows platform. Do you think that visiual basic is strong language or complete tool for all kinds of software development ? Will C++ or C# come on my way for software development while i'm visiual basic.
View 3 Repliesvisual 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]
View 1 RepliesI am looking for a contol either listbox or listview to support my requirements. Basically how my application looks is:
[Code]....
Having said these things. I used to program in VC++6, VB6. But using those version now seems not realistic now as I lost touch. But if I have to use the latest 2008 versions, for which I do not have any experience seems scary. So, If you are reading this , and you have got some experience in these fields or using controls that support my requirement, can you please let me know which programming language or IDE and Control should I use to develop this application. PS: the image is made using mspaint and does not represent actual program.
I am new developer of Visual basic and planning to develop WIndow XP PC based application for small retail outlet business, the main functions are to records the daily business transaction and produce reporting at month end.
My questions is what visual basic releated software or tools that I need to install in my Window XP PC for developing this application??
how to develop unicode application in vb.net and sql server 2008 ?how to start develop and what are the things i have to consider to develop effective unicode application ?. this application should support japanees and english language based on user selection.i took steps but i don't know it is correct.
1. i created tables in sql server with fields, for strings - NVARCHAR, for integer INT, for datetime DATETIME,for numeric NUMERIC.
2. i created another setting-table to have all screens name,label names ( for labels and grid column headers ) and corresponding japanees display names and another column for english display text.
so i'm just going to fetch Japaness/english display names from setting-table on form load and change the labels.Are these correct ? or anyother way to do unicode application effectively ?
i've developed vb.net window application in english language.. its working fine but it has to support japanees language also.. Displaying text, input text every thing should be japanees... so user can select english or japanees, based on that label, input control language has to change..
View 1 RepliesJust knowing 20 commands i am developing a app?very impressed on myself!Just knowing 10 commands + common sense + special sense each man has i had world most dangerous spy tool....but on my guru & best friend advice i dropped it..but in future will use for good purpose So here is the new scene We are team of workers had blogs,microblogs and other things i decided to create a tool for my self which is like office assistant to assist in our work at office
my tool will do the submission process when we are not in our office
my idea is using a web browser control and do it with vb commands
so kindly think yourself in such position do you agree to do submission task with web browser control or you can do it some other methods?
whats your opinion? what i mean open a website on web browser control submit the details from listbox(which increment on every submission)i think you now got how we are going to do this!!!
so i am need some one advice shall i proceed with this?i had three big challenges
1.Time
2.Yes Of Course Time
3.Ya Time But Time + Work Accuracy
so kindly guide shall i use the web browser control or use method like direct server post?
I am a new bee in windows application in VB.net.I am now in the process to develop a windows application from zero.I have searched online on the reference to develop a windows application from zero but fail.
I also fail to find any resources on beginning on vb.net which introduce all the tools inside such as menustrip.Does anyone has any idea how to find out the resources?
I'm about to start a new project and want some advice on how to implement.I need a web application which contains a booking module for reserving timeslots, and a time management module which will enable employees to clock in / clock out.
If I am writing an update to the time managment module, I don't want to disrupt the booking engine availability by releasing a new solution containing both modules.to make things more difficult, there is some shared functionality like common users, roles and security.Here's a suggestion I've gotten, which sounds a bit cruddy, but may be functional.Write a 'container' web application which consists of basically a frame, and authentication / security features. This then has links which, will load the 2 independantly built and released web applications into the frame.I can see that say, if I wanted to update the time management module,
I am developing an application which will be used to scan the barcode from a particular document, as i am just developing who i will get know that barcode scanning is working i dont have device at the moment
View 2 RepliesMy 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)?
I have the following code, which is meant to loop through a list of CheckBoxes and if checked if gets the text contained in the linked textbox through the tag of the Checkbox, i have used it before and it worked fine but this time i am getting the following error:
Null Reference Exception was unhandled
Dim DisCheckBox As CheckBox() = {chk0_6, chk6_12, chk12_18, chk18_24, chk2_3, chk3_4, chk4_5, chkXSB, chkSB, chkMB, chkLB, chkXLB, chkS, chkM, chkL, chkXL, chkXXL, chkXXXL, chkXXXXL, chkW8, chkW10, chkW12, chkW14, chkW16, chkW18, chkW20}
For Each Chk In DisCheckBox
[code]....
I keep getting a null reference exception w/this program, and its on the line that declares the array. I've looked it over and over and I just don't see why... Can you let me know if you see anything obvious? I'm also getting an "index out of range" exception, but it looks right to me...I declared everything with an 11 for 12 months, 0 to 11 for the intcount.
[Code]...
If Not obj is Nothing and obj.IsActive Then ' null reference exception??constructions like this in C# works, because obj.IsActive is not checked if the first condition is false...
View 2 RepliesI am building a VB.net application using VB Express 2008 which connects to a MySQL database. Right now, I am only selecting records, but will be writing code for update / insert. I have installed the MySQL Net Connector, most recent stable build. I have set a reference to it in project references. It makes a connection and reads just fine, no issues there at all.
My problem is this: When exiting the project (via calling "End") I am receiving a null Exception error. Here is the error[code]....