IDE :: Backgound Worker - How To Call Functions And Subroutines
Jun 10, 2009
Visual Studio 2008, Standard Edition VB.NET I have only limited experience using the background worker, and all that I've done with it thus far was fairly straightforward and worked fine.
I am now looking to run a process in a background worker which calls various functions and/or subroutines, but of course it generates an error indicating that it's on the main thread (or something like that - I don't recall exactly, but that was the crux of it).
I have been learning vb.net for about 6 months now and I red few books about basic visual programming as most to them have information about the basic concepts like what is Object oriented programming, subroutines, functions ,inheritance etc and bit about ADO connectivity to database. Having said all that I think I have good concepts about all these things but now I want to proceed further but can't find appropriate text books or online tutorials.
I would like an overview of System.EventArgs. I have an understanding of System.Object where I can pass data between subroutines and functions using Public Classes. I am curious what EventArgs do?
I am very familiar with modules from my time with VB and my other programming, but what is the most commonly used practice and the best way to go about this for a website application with ASP.NET? Say I have multiple pages (in multiple directories; some in the root directory, some in child directories from the root) that will call the same set of functions and subroutines, how do I go about putting this reusable code in a place where the pages and their respective classes can call the functions/subroutines?
I want to know what are classes , objects , a namespace , subroutines,functions,methods,properties and differemce betweem byval and byref in your words.
am developing an application automatingExcel 2011 from Visual Studio2010 with Visualasicthe problemis that I can call other subroutines.I developed the following subroutine to addformatting to the selected ce
I have an application that queries DHCP and pulls scope/subnet information. There are roughly 8k scopes on our network to query so reporting this data takes a little bit of time. I currently have this running on it's own thread and reporting to a progress bar so the applications doesn't seem inactive.
The DHCP api functions can report a total, a max read and a resume argument. This means that I can, in theory start 4 threads and have each thread read through 2k subnets, so it will only take 1/4 of the time to read all this data. Would I need to create four separate background worker handlers, do_works, runworkcomplete, report progress etc.?
i was trying to call form2 from form1's background worker's DoWork event . The problem is that when the event runs , form2 gets loaded but it shows not responding.i am also passing a value to form2 at run time which the background worker calculates?
I am fiddling with the code here: [URL] I had a couple errors when I copied/pasted it into my project. I dimmed a couple variables, now the squiggle lines are gone, but I'm not sure how to call the functions in the project? Do I use a Lable or a TextBox? How do i make this work?
i wanted to use streamwrite i use System.IO at the top of the code. What do i use if i want to use the E-Mail capabilities of the program?Does it matter what e-mail program u use as to what Process to call?I know that MAPI whould be there somewhere but unsure.
I have a Util module in my VB.NET program that has project-wide methods such as logging and property parsing. The general practice where I work seems to be to call these methods directly without prefixing them with Util. When I was new to VB, it took me a while to figure out where these methods/functions were coming from. As I use my own Util methods now, I can't help thinking that it's a lot clearer and more understandable to add Util. before each method call (you know immediately that it's user-defined but not within the current class, and where to find it), and is hardly even longer. What's the general practice when calling procedures/functions of VB modules? Should we prefix them with the module name or not?
say you have a sub containing an io.streamwriter. That streamwriter is declared and used only inside that sub (and not as static). Should you still call dispose on that streamwriter or is it disposed automatically as it is no longer in use after that sub, until you call that sub again?
Im not exactly sure how to word this question, but I will give it my best shot.In a new program I am starting I would like to put all the code from a button_click event into a file (many others as well into different files), kind of like a class file in the sence of it being external.lets say I have a button called btnadd and it has some validation code in it Private Sub btnadd_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnadd.Click
My problem is that I am creating system tools for windows with a good gui and I don't know how to start with it. One of my difficulties is making code for calling any window tools for example, defragment.msc, backup, system restore, registry editor(I knew there's already a thread in here but it is closed).In short, I will create a "Utility tools ALL IN ONE" for my project somewhat like a registry cleaner or advance system optimizer and the likes.
I have implemented webbrowser control in my windows application. I have some functions inthe class file. i want to use those functions from the webpage which is displayed in my windows app through webbrowser control..For example say... I have an standalone windows software. Which has a webbrowser control in the some form. Now i would like to create a webpage that can be displayed in the webbrowser control in win app which has some buttons and textboxes. When i click on button in the webpage it should get the version number of that software. I have some other functions that are in the class file aswell.. but dont no how to call those functions from that webpage when a button is clicked or something like that.
I have a midterm project where we must replicate what our teacher has made, it is a convenience store program. I am having trouble calling the functions, he wants us to use these:
PopulateItems => Populate Items listbox based on the category selected GetItemPrice => Retrieve the price for a given item GetItemPriceFromPurchases => Retrieve the item price from the purchases list box (optional. You may not need
[CODE]...
So far I have the first list box populated when the form loads. However outside of that I do not know where to call the function in order to populate the second list box upon selection of the first.
I need to create unit testing project for my current website. The currentw ebsite si written in VB. All unit testing examples are using interface to create mock object. My current VB class does not implment any interface. Can I add interface and implement it to my current class and functions without affecting or changing codes to any pages in my website that call the functions? For examples my current class is like:
Is there a way to call functions within a class upon instantiation of that same class? Basically, I have functions within a class, but I want to automatically call some of those functions simply when there is an instance of the class created.
Basically, I have this structure:
Dim instance as new class instance.function1 instance.function2
I recently added three subroutines to a form, and as a result of adding only the three subroutines, I have noticed some weird behavior in the form and I can't pin down why these three subroutines would cause it.
To detect 'death of player' I am using the mouseleave event of my picturebox background (background1). Unfortunately this triggers both when the mouse enters an 'evil' and the 'points' and ends the game without the player being able to collect points.
The obvious way to solve this would be to swap detection to entering evils.
Unfortunately I am dynamically creating my 'evils' and do not know how to also dynamically create subs to deal with MouseEnter. Here is my code for generating the 'evils'
'The number of evils (asteroids) Dim evilcount As Integer 'A count for use with comparison to evilcount
I'm struggling with an event related to my communications class.I'm calling a 'DataChange' function via event handler any time I receive new data over my serial connection. I then proceed to load that data into a DataGridView, perform some formatting, etc for the users. I'm getting a ton of problems due to the frequency at which the DataChange event is called and seems to steal the focus out of othert subroutines and functions mid-process.For example, I'll attempt to transmit data back to the serial device. After I format the data, but before I can actually call the Send function from my library the focus is directed back to DataChange and I never actually transmit my data.
Is this a problem best addressed by threading the DataChange related routines, unhooking the DataChange event before a function or routine then rehooking, or is there some basic principle I'm not implementing.
The Visual developer express outline provides hide/plus-minus signs throughout the HTML code, and it does this for Class's, but not for my subroutines in an ASPX file.Is there a way for it to do this, so I can reduce subroutines I'm not working on at the moment? I know I can highlight areas and hide, but it's kind of clunky to do quickly through many subroutines if I have 2k lines and a hundred subroutines.
