VS 2008 Project / Application Global OleDbConnection Object
Jun 17, 2009
I need a single, global OleDbConnection. One which will be available to use throughout my app/project. Another project like a custom UserControl? I should mention I'm not using TableAdapters, BindingNavigitor, etc. The datasource is not associated with my project. I communicate with the Db through code I write. I'm just a hack trying to ride with the big dogs while I develop an app for my job... We were/are in the stone-age!!!
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Jun 15, 2009
What is the recommended way in VS.NET to have a global application handler object? Something that can load/verify/return user folders, settings, application specfic settings, manage the unhandled exceptions, etc. I would have a class that has most of the code, then subclass it for each application.
I can create one if I start as a module instead of a form. But then I lose some options such as NetworkAvailabilityChanged, etc. I define a "Public" object from within a form (I don't think so and don't feel this would be the right approach.)?can I "attach" an object to an existing global object store (such as "My."), etc.?
Once created, any object in my application should be able to reference methods/properties of this application object to get default folders, user values, etc. as necessary.
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Mar 15, 2012
evrytime i add new controls to a form in vb.net the designer regenerates code and asks me to make corrections, so i have to keep on changing the object declarations to global using the 'global' keyword evertime it regenarates code,especialy dataset objects.how can i prevent this?
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Oct 26, 2009
I have an object that is defined as a global variable based on custom class. Within that class I have an event that gets fired a certain intervals. These events are fired on the same thread as where the object is declared. How do I create a global object, but have the events within that object fire on a separate thread?
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May 17, 2009
I try to create a sub main in a project but i can not.I have create a module called Module 1 and inside i have created a Main Sub which is intended to creta a thesaurus_form class instance , like this Code: Module module 1Public Sub Main()Dim thesaurus_form2= New Thesaurus_formEnd SubEnd module.Instead of this, once it has cretaed a first instance of the thesaurus_form class, it creates another one what i dont want at all..How can i do do make it execute the code which is inside the thesaurus_form_load sub..I also can not create a global variable or a staitc variable, because i receive this message.static is not valid in a member variable declaration.
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Apr 1, 2011
I'm trying to build a language dictionary in VB NET in order to be able to have several languages in the application.This dictionary has a init method that loads from database the entire dictionary and stores it in memory.In the rest of the classes of the project, I added the reference and I can use directly the object without create a new instance because their methods are shared.
how i have to load the dictionary content in order that the rest of classes only accessing to Language.GetWord method obtains the properly record of the collection, same way as My.Settings class.When My.Settings is used from any class the values are loaded. I'm looking for the same effect.This is the code of the class:
Public Class LanguageProvider
Private Shared CurrentLanguage As Collection
Public Shared ReadOnly Property GetWord(ByVal Label As String)
[code]....
Function LoadLanguage must be called when the application loads, in order to access once to database. After that property GetWord must access to the collection with the words and return the result. The problem is that the instances are not the same and the dictionary is not loaded when a class uses it.
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Jun 7, 2010
I'm at the end of my tether now.I'm trying to build a website which takes its information from an access database. ASP.net seems to be the answer, so I've downloaded Visual Basic Express 2008 and Visual Web Developer Express 2008 and I'm following a tutorial to learn the basics.
I can't seem to get the OleDBConnection and the OleDBCommand functions to come up in my toolbar. I've created a ASP.net Web Application, a Webform and tried "Choose Toolbar Items", where I've ticked the box for both, but they still haven't came up in the toolbox. This is the last step in what has been as steep learning curve for me.
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Jun 8, 2012
I would like to declare a list above Sub procedure and to be able to add/modify it. I would like to have something like this:
[Code]....
When i run the above example i get an error like: Object reference not set to an instance of an object.
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Dec 1, 2011
I'm developing a revised version of a system I have been using for years, but with all the advantages of .NET features that were not around when I first made this. It's proving a steep learning curve! So, when a user logs in through my Login.aspx page which simply compares username/password to Database record, the system creates a session variable containing the user's Username and various other things. There are two type of variable which will be common to all elements of this system
User Specific data, Username, Permissions, etc
Setting variables, drawn from a database of pre-set facilities which are setup within the system, some will determine which facilities work, how they work, and some will be dependent upon the User's permission. Obviously, I could set everything within the Session data, but that'd be inefficient wouldn't it? If I were to set these globally available variables in my App_Code, how would I go about setting this up so that, for example, those variables which require a database call, are set for the duration of the Logged-In session and do not require constant Database lookups? Further to that, those variables which are dependent on the session state, would need clearing on each LogOut. I am using VB.NET.
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Feb 24, 2011
This is also posted in the database development forum. As I think the same problem could apply to things other than connections, I am posting it here also. I have created a custom class. All methods in this class, I want to interact with a single connection object.
Imports MySql.Data.MySqlClient
Public Class clsRegTester
Private cn As New MySqlConnection
[code].....
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May 31, 2010
I have a huge website (containing around 5000+) pages. There is a theme functionality in the website where user can choose different colors for their profile. Now i want to use the ASP.net theme feature and put different CSS (for different colors) in the theme folder and in Global.asax i want check the user theme and render appropriate link element with the css. But my problem is, i am not able to access the Page element for adding the link in the page. Here is my code
Dim page As System.Web.UI.Page = TryCast(System.Web.HttpContext.Current.Handler,System.Web.UI.Page)
page.StyleSheetTheme = "Black"
But when i run this code I get a Null reference error.
P.s : My application is very huge so its not possible to have a master page or a base class and inherit it in every page.
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Sep 27, 2010
I am working on a solution that does not name namespaces in code files. Instead it uses the root name space of the project (which is the same across all assemblies). Basically there is only one implicit namespace.
Well, I am trying to isolate some code so that I can run FxCop against it. I explicated named the code file with a namespace to do this. This works for FxCop, but it bricks the entire solution.Visual Studio is now asking me to prefix all uses of the implicit namespace with Global. So instead of:
[Code]...
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Nov 12, 2009
My problem is when i try to call Application.Run() in a application without a form i get "Object reference not set to an instance of an object." when i run it outside VS. but if ran in debug or release mode it works just fine. i may just be forgetting to setup application right, but ive done it before in this same manor and it worked fine.
Sub main() 'this runs first.
AddHandler Application.ApplicationExit, AddressOf ExitEventHandler
dbg_f("handle added")
[CODE]...
Commented out init_timer and init_ready, and now it causes the same error for the myName line. there seems to be something wrong with class Application. btw theres seems to be something wrong with the forum code formatting.
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Apr 29, 2011
given a MDIParent Form and 2 MDI Children: frmChild1, frmChild2..How can i realize a Instance of MyClass in MDIParent, which I can read and write from frmChild1 and frmChild2 , too
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Jan 12, 2010
I am currently trying to program an online drawing program using the HTML5 canvas.the thing is, I need to have the current canvas saved somewhere globally. Static variables work, but they do not get shared across a Webgarden. This results in two different drawings being created.I will have to somehow create a new application object which is shared. I figured I will need an external application holding them.
1) How do I replace the application object with my own?
So either I will have to make my own program and call to it with remoting or use the ASP.NET session state server for application variables. I favor the Session State Server though.
2) How do I use the session state server for my own variables? How do I access it?
I searched high and low on the internet and only found the ideas mentioned above, but no help executing them.
I mainly code in VB.NET, but I can also understand C# code for examples.
A little info on my application:The client side has two canvas objects on top of each other. The top canvas object us used for drawing stuff, the canvas object below it holds the drawing in the end.When something is drawn, it is sent to the server in it's base64 representation. (getDataUri).The server puts this graphic on top of a stored Bitmap object through a Graphics object.
How the changes are being distributed to the other clients, I am working on that right now. Either I transfer the complete picture or each and every change that is submitted. This should work through Server Push. If this does not work thoroughly I will have to save and timestamp changes. A link to the current implementation, which is not currently fetching changes (but they get transfered to the server... With the problem that some reach one instance some reach the other on either w3wp in the webgarden) from the server is here: http:[url].....
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Jul 7, 2011
I want to create a global function to use throughout my application. Let say it's about the connection to the database.My code that i plan to use in my global function is:
myConnection = New SqlConnection("...........")
myConnection.Open()
So that I can call it to use in every form throughout my application. This can make me easy to edit the connection later.how to define this global function and how to call this function in the form.
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Aug 26, 2009
How do I defiine a global variable for the whole application so that it does not have to be defined in all the forms that need it.
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Mar 17, 2012
I have implemented a global Hotkey into my code but the problem is that when I move the focus from the form to IE (For Example) i cannot use the Hotkey from my application. Everything is working great if I was to stay int the form but that's not the purpose of this code.
Private Sub frmMain_Load(ByVal sender As System.Object, e As System.EventArgs) Handles MyBase.Load
RegisterHotKey(Me.Handle, 9, MOD_ALT, VK_F9)
End Sub
Private Sub frmMain_FormClosing(ByVal sender As Object, e As
[Code] .....
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Mar 23, 2012
In my old VB6 app, I defined fields such as:
CODE:
As I am trying to rewrite this procedure as a project in vs 2008, all of the OutLook references are being flagged.
In project properties/references I added the reference: Microsoft Outlook 11.0 Object Liberary, but still flagged as error.
Is there another namespace or something I need?
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May 20, 2010
I am in the middle of development of a WPF application that is using Entity Framework (.NET 3.5). It accesses the entities in several places throughout. I am worried about consistency throughout the application in regard to the entities. Should I be instancing separate contexts in my different views, or should I (and is a a good way to do this) instance a single context that can be accessed globally?
For instance, my entity model has three sections, Shipments (with child packages and further child contents), Companies/Contacts (with child addresses and telephones), and disk specs. The Shipments and EditShipment views access the DiskSpecs, and the OptionsView manages the DiskSpecs (Create, Edit, Delete). If I edit a DiskSpec, I have to have something in the ShipmentsView to retrieve the latest specs if I have separate contexts right?
If it is safe to have one overall context from which the rest of the app retrieves it's objects, then I imagine that is the way to go. If so, where would that instance be put? I am using VB.NET, but I can translate from C# pretty good. I just don't want one of those applications where the user has to hit reload a dozen times in different parts of the app to get the new data.
All contexts are created in Using Blocks to dispose of them after they are no longer needed.When loaded, all entities are detatched from context before it is disposed.A new property in the MainViewModel (ContextUpdated) raises an event that all of the other ViewModels subscribe to which runs that ViewModels RefreshEntities method.After implementing this, I started getting errors saying that an entity can only be referenced by one ChangeTracker at a time. Since I could not figure out which context was still referencing the entity (shouldn't be any context right?) I cast the object as IEntityWithChangeTracker, and set SetChangeTracker to nothing (Null).
This has let to the current problem:When I Null the changeTracker on the Entity, and then attach it to a context, it loses it's changed state and does not get updated to the database. However if I do not null the change tracker, I can't attach. I have my own change tracking code, so that is not a problem.
My new question is, how are you supposed to do this. A good example Entity query and entity save code snipped would go a long way, cause I am beating my head in trying to get what I once thought was a simple transaction to work.
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Dec 27, 2011
My project is to create a shopping cart application. I have my main form and from there the user can go to two different forms to add books to their cart, the cart being the main form. This all works. What I can't figure out, is how to use global variables for the prices, shipping, tax and updating the total. I have places for this information to show up on the main form, and I've created a module for the calculations and prices, but I don't know how to code it to get the prices to show up in the specified areas.
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Jun 28, 2010
I want to define a global exception handler for unhandled exceptions in my console application. In asp.net, one can define one in global.asax, and in windows applications /services, one can define as below
AppDomain currentDomain = AppDomain.CurrentDomain;
currentDomain.UnhandledException += new UnhandledExceptionEventHandler(MyExceptionHandler);
But how can I define a global exception handler for a console application ?currentDomain seems not to work (.NET 2.0) ?
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May 5, 2010
For reasons that are beyond my control, I have three Projects. Projects A and B reference project C. Project A references project B so that it can open a large form in project B. I now need to open that large form from project C, but VB won't allow me to add a reference from C to B because that would create a circular dependency. I found a way around it, though. I created a Timer in A, and when I opened C from A, I passed in that timer. When the user performs a certain action, I enable the Timer from A, and this causes C to open B for me.
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May 1, 2009
i could use Global x as string in vb6 in a module to declare it with global privelages, how can i do this in vb2008? how to declare a global variable in vb2008? so that i could use it anywhere i want. i know global variables are not recommended in programming but i need one.
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Aug 8, 2009
how do i can modify IEXPLORER window size with one button from my own application/project?I have form with button1 what should be a code?
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Sep 8, 2010
I am trying to create an application using VB.NET which will import python object.
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Sep 9, 2009
I have a Windows Form application that has a global error handler to display unexpected errors.
Namespace My
Class MyApplication
Delegate Sub ProcessParametersDelegate(ByVal sender As Object, ByVal args() As String)
[code]....
1) for the same deployed code, I SOMETIMES get line number in the displayed StackTrace error message and sometimes do not, even when the error message includes source code that I have written rather than a referenced binary. The project is compiled with a DEBUG configuration.
2) The application strangely minimizes to the tray when the error occurs (I thin it is unlikely that anyone can diagnose this issue w/o my more code posted, but I'll mention it anyways)
3) When I try to intentionally raise an error by, for example, dividing by zero hoping to test by global error handler, I get a dialog error message from the interactive debugger rather than jumping into my global error handler (which i want to debug because there is more to it than I posted.) Do you have any idea how to triggerand force teh execution of the global event handler?
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Feb 29, 2012
I am attempting to create a new mobile app using VB in visual studio 2008. I select "File" "New Project". Select "Smart Device" in new project window. Select the "Smart Device Project" from templates. Select ".NET Framework 3.5". Select "OK" and get the dreaded "object reference not set to an instance of an object"
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Jan 23, 2012
I am following the guidelines from [URL]..Mid way through the process they have you rename your App_Code to Old_App_Code folder and compile ... at which point i had DLL's in my BIN folder and i started to repair my aspx/ascx files.
e
Today i find the compiled bin files missing an now all my pages are sqwaking they cannot find the numerous Public Class - Public Shared Function's ... I have verified their build action to Compile but am unable to rebuild an have them regenerate on account of project errors.Advice on how to rebuild the bin or how to properly reference a Public Shared Function? My VB code includes an Imports statement taht used to find the class in app_code.
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Nov 15, 2010
i was developing Voice Chat Application in visual Basic .NET 2008 i try a lot methods to make installer for it :
1- i add Project Setup Project for my Project for Visual Studio 2008 Deploy & setup Type Projects and make it with output option and detect dependices
2- i try make it with Setup Factory 8.2.1
3- i try with MSI Factory 2.0
4 i try with Setup Factory 6.0
and after making installer copying it to my test virtual Machine or my friend lap and install it i get this error when try to run my application :
[Code]...
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