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?
View 3 RepliesI want to know what are classes , objects , a namespace , subroutines,functions,methods,properties and differemce betweem byval and byref in your words.
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EDIT: The above class is just an example of what could be returned from a web service. I won't have access to modify it at all, sorry if I didn't make that clear.Is it possible to somehow make a clone this class, so that it retains all of the properties values, but hides the fact that there is a Public function?I'd like to be able to take some existing classes we retrieve from a web service(which we didn't write) and be able to pass them on for use in an application, but without exposing the functions. I don't want to go down the route of creating my own classes that specifically define each property and write the values in (due to the sheer size of some of them), so I'm looking to see if there is anything dynamic I can utilise (maybe there is a way using reflection?).
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 am working on a bitmap class module in Visual Basic 2010 that has an option to create a graphic grid on the bitmap.
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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.
View 2 RepliesI 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?
View 3 RepliesI have 2 arrays X(n) and Y(n) where n can vary programmatically, no set value. I want to pass these two arrays between two subroutines.
Sub sub1()
...
call sub2(X,Y,n)
end sub
sub sub2(x,y,n)
...
end sub
I want to know how to prepare the arrays for the "call sub2" and how to extract the arrays in "sub2".
Here is some example code of what I mean:
vb
Public Class Form1
Private Sub Button1_Click(ByVal sender as Object, e as systemEventArgs) Handles Button1.Click
[Code]....
I'm refactoring my VB project into 2 projects, one being a utility library that I want to share with future projects.My solution's layout is like this:[code].....
util is created as a class library, and the member files added into it. I've then added util into the main project's references.However, when I try to call functions in util.vb from my main project files, I get build errors like this:
error BC30451: Name 'LogException' is not declared.
error BC30002: Type 'VarFile' is not defined.
These are defined in util.vb, and it compiled fine when it was part of the main project. The declarations look like this: (I've trimmed out the details)[code].....
I can add util.vb "as link" into the main project and it will solve all the build errors, but that seems to defeat the purpose of refactoring out the class library - I would like to develop this library separately, and not always have to keep track of which file links I haven't added in my main project.
I have a Module in VB.NET called Math.vb and in that module, I created a Function that displays returns the percentage of one number to another. I have a Sub that calls the Function and I call the Sub from my Form1 class. Is there an advantage/disadvantage to putting the function in the class or the module?
View 5 RepliesI have a MDI application and a very complicated class there which populates its properties from a dataset derived from an external database. Each form, including child forms have to be able to access that class and use its properties thorughout the whole session.I don't know where to 'preserve' these property values within the application. I kmow many books etc. suggest not to use public variables but I really can't find a way to solve this other than to use a public variable (which is a list(of my custom class) in this case.
I have a separate class called PublicItems.vb and declared there my public variable as
Public Shared secuniverse As List(Of myCustomClass)Is there something wrong with the syntax because if I try to use the variable secuniverse in my main application class, I get the following exception:'sectoruniverse' is not declared. It may be inaccessible due to its protection level.
The way my code is now its all basically in one class and I want to move different functions into other classes to organise it a bit.What is the best way to do this as I have been having problems I was just bringing in a new Main class when I needed to call the functions in my main class but this would give errors when I run the program and not let me run it?
Private mc as new Main()mc.functionNeeded But the error when I try to run"Stack over flow exception"
An unhandled exception of type 'System.StackOverflowException' occurred in System.Windows.Forms.dll
Any tips on how this is done. I couldnt find any info on it (probably because its so basic)
I am integrating two disparate data sources where each value may depend on one or more other derived elements.This app runs as a windows service.Currently all my code is in a single class.I am upgrading to 2010 and wondering if best practices would be to break out my functions into multiple classes - there are over 100 data elements that need to be constructed. The following is an example of a couple derived items:(Is there a better way to do this - when complete I will pass this app off to someone else to support and want to make sure I give them the best beginning.[code]......
View 2 RepliesI was thinking about writing some VB 2005 code that would be able to open an excel file and keep it open while I do things in separate functions/subs basically just check boxes, so each check box is its own sub but HOW do I do that with out opening and closing the excel file for every check box sub, since every time I make a check box the sub comes up as private?
View 9 RepliesI have an asp.net web app. It has a shared class, and I want to have the connection string the same through out the site. My string is in my web config, but I don't want to type this all over the place:
View 3 RepliesIs it considered an acceptable practice to use Modules instead of Classes with Shared member functions in VB.Net?I tend to avoid Modules, because they feel like left over remains from VB6 and don't really seem to fit in anymore. On the other hand, there doesn't seem to be much difference between using a Module and a Class with only Shared members.
View 4 RepliesI'd like to get a more refined programming style and I was wondering if any of you might give me a hand...(How to declare public variables, constants, functions...in a proper way),is there any useful link or pdf document I could have a look in order to improve my style?
View 5 Repliesgive me a good resource that explains the difference between a Private, Public, Shared Functions/Sub/Variables? I normally use Public for Subs/Functions inside of Modules I call from other parts of the program. But I'd like to get more of an understanding of how and when to use them. I want as little as impact to a system that is running my programs as possible, so i guess the key here is I'm trying to just get more proficient in my coding.
View 8 RepliesI've got a program that runs from one Windows form, Form1, with stuff declared all in that class: public variables, public functions, subs, etc. I decided that the form was getting cluttered, so I added one button to bring up a new form, Form2, and I put some of the buttons & check boxes for testing over there, so that Form1 can be more visually clean. Problem: when I go to put the code for the tests into the buttons on Form2, none of the public variables or subs or functions that reside in Form1 are visible in Form2. What statement/s do I need to add (and where) so that the public "stuff" that's declared in the class for Form1 is visible within Form2, please?
View 6 RepliesI would like to send the variable "dst" from the Combobox1 sub to the Data sub. [code]...
View 1 Repliesi have have a few questions about the syntax of the lan.:
1) What is the 'Get' statement and when do you use it?
2) Whats the difference between public, private, protected etc... when declaring functions and subs.
3) When would you use the overrides property?
I am trying to get a handle on SyncLock and multithreading, but I am having some trouble wrapping my head around exactly how it should be implemented. I have a Public Class Utilities with a many Shared Functions. I want to make sure that each function can only be executed when there are no other concurrent calls to the same function. So If I have 2 functions, A and B in a Public Class Utilities, what is the syntax so that a function "locks" while it is being executed, preventing any subsequent calls until the "locking" thread has completed?
CODE
Public Class Utilities
Public Shared Function A (ByRef i As Integer) As Integer
[CODE].............................
I know I need to wrap the statements of execution in a SyncLock block, but I am unsure of the scope of the parameter used with SyncLock...is it private to the function, class, etc? Can the same object be used to lock both functions if they are independent?
My plan is depending on the users screen resolution a different form will open. Thats all fine and works hunky dory.
However, the form pulls code from a public sub and updates fields on the form based from the public sub[code]...
My problem is how can I change the FORM1024x768 to say FORM1366x768 if the users screen resolution determines a different form is chosen. I need something like[code]...
Im having problems passing values from my class "client" to display on my main form in text boxes. Im looking up a user input number and then pulling the clients first name, last name, and phone number from a text file. I figured out how to pull the information from the text files, but now im having difficulty passing the values to display in a another forms text box. This is what I have so far.[code]....
View 11 RepliesI have a public variable that I declared in form1 of an application. I am trying to call that variable in form2 and then pass that variable in a sql query.
If I declare
Public Class Form1
Public payPeriodStartDate, payPeriodEndDate As Date
How then to I declare that variable in form2 and how to I pass it to my sql query
SELECT [Exceptions].Employeenumber,[Exceptions].exceptiondate, [Exceptions].starttime, [exceptions].endtime, [Exceptions].code, datediff(minute, starttime, endtime) as duration INTO ScratchPad2[code].....
I want to know if it's possible to retrieve the variables name from when it was passed into a certain function. For example, if I call parseId(myId) to a function with the signature parseId(id), i can obviously retrieve the value of 'id'. However, is there any way I can retrieve 'myId' as a string (without passing it as another value)? Specifically in vb.net, but I'm interested in how it would work in any given language.
View 3 RepliesI'm trying to update an application from vb6 to vb.net. The orig app used the winsock control. Unfortunately I can't nor do I want to use it in the re-write. Are there any decent public classes with events that wrap the Socket class?
View 1 RepliesI have inherited some god awful vb.net code and having trouble trying to work out the generics for looping through the current structure in place.
here is a snippet of the struct
Public Structure ApplicationDetails
Dim ID As Integer
Dim AgentID As Integer
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but i am not sure on the syntax to set the value and when trying to get the type i get item.GetTYpe() is not declared.
How do I pass parameters of LINQ DataTables through Functions and Subs
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