VS 2005 Member Variables And Events?
Oct 12, 2010
How should I handle events in this situation I have "Class1" with a "PropertyHasChanged" event.In "Class2" I've declare a Public Member Variable WithEvents of Type Class1.As well, Class2 has the Event "OtherPropertyHasChange".In a Form Class I've declare a Public Member Variable WithEvents of Type Class2.The Form Member has access to the "OtherPropertyChange" Event but not the "PropertyHasChanged" Event.Question is,how do I accesss the Events of Class1 from the Form Class?
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Jun 12, 2010
I have created a class called 'MyAddress' and in the form load event i am adding few objects of that class to the combobox. I want to know how should i set and read the values of the member variables of that selected item of the combobox. I have tried this and is working, but i am not sure whether it is the way to do
vb
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
[code].....
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Apr 28, 2011
Cannot appear to be able to get this function to not have the above error.Private Function GetIncidentActions(ByVal FromAgentID As Integer, ByVal ToAgentID As Integer, ByVal incidentAction As Integer, ByVal ActionDate As Date) As String
[Code]...
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Jan 6, 2011
I have 2 tables Table A & Table B Table A has the table values that I want to be populated in a datagridview control.The challenge is that column 1 in table A contains an ID(foreign key) to a name field that is a located in table B. I need the datagrid to have the first column be a combobox that displays the names(from Table B) that are already in table A via the ID's, but reference the populating values from Table B. So that when you bring down the combobox you would be choosing from Table B data but populating table A with the ID and you would see a name there instead of an ID.[code] How do I populate my DS dataset with Table B? And how can I create a link to these two tables using a bound datagridview control?
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Aug 20, 2010
I read somewhere that interfaces can have member variables.Static final constants only, can use them without qualification in classes that implement the interface. On the other paw, these unqualified names pollute the namespace. You can use them and it is not obvious where they are coming from since the qualification is optional.
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May 14, 2011
I'm building a litle console app that involves a control hierarchy -- there are screens, and inside of screens you can compose controls together.
You can add controls to a screen by declaring member variables (which all inherit from AresControl). The control constructor takes a simple coordinate pair. It looks like this:
Public Class IntroScreen : Inherits AresScreen
'Controls
Private LabelSelect As New LabelControl(72, 0)
[Code]....
This would result in cleaner, convention-based code. But try as I might, I can't get it to work - I can walk the member variables of a type, but I need to walk the member variables of a live object.
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Jun 9, 2010
I am generally not one to engage in subjective arguments over matters like variable naming, code formatting, etc. So I have no intention of starting an argument here.I just came across this (old) blog post which recommends not prefixing member variable names:
[Code]...
I get it: member variables can be lower camelCase, and public properties/methods can be PascalCase. But VB.NET is case-insensitive, so you can't really give a private member the same name as a public property except with a lower case first letter.I've generally prefixed member variables with an underscore, but I've been told that's not idiomatic.
So really I'm just curious: how do you name your member variables in VB.NET? And is there a "standard" way?
I'm not asking because I believe there's a "right" way or because I particularly want to change my style, and certainly not because I have any desire to tell others they're "wrong." Like I said, I'm just curious.
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Sep 19, 2009
Warning1property 'Events' shadows an overloadable member declared in the base class 'MarshalByValueComponent'. If you want to overload the base method, this method must be declared 'Overloads'.
<Global.System.Diagnostics.DebuggerNonUserCodeAttribute(), _
Global.System.ComponentModel.Browsable(false), _
Global.System.ComponentModel.DesignerSerializationVisibility(Global.System.ComponentModel.De
[code].....
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May 27, 2010
How should class member variables be used in combination with class methods?Let's say I have a class 'C' with a member variable 'someData'.I call C.getData(), which does not return a value but instead puts data in C.someData. The class that instantiated 'C' first calls C.getData and then uses the data by accessing the member variable C.someData.I call C.getData() in the class that instantiated 'C' which is a function that returns data.I myself prefer the second way. But it also depends on the situation and it's a small difference. Is it 'bad' to have class methods that depend on the classes internal state? What are the best conventions?
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Jun 6, 2011
I am currently making a server monitoring application that pings the server to check its uplink, so far it creates all the picture boxes and labels for each server, and then pings the server, although I have a picture that I want to change dependant on the result.
Below is the code I am currently using, the problem occurs with the objectname variable which allows dynamic coding, where i get a error, saying that "Public member 'image' on type 'String' not found".
Private Sub Ping()
Dim i As Integer
Dim objectName As System.Object
For i = 1 To count - 1
[code].....
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Jun 2, 2011
how do I overcome it? I have created a class and compiled into .dll This code
[Code]...
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Aug 13, 2009
In Visual Studio 2008, if I do this:
[Code]....
Does anyone here know how to get the above to work WITHOUT warnings being generated?
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May 31, 2010
In the following code i get a warning at line 59:Warning 1: Access of shared member, constant member, enum member or nested type through an instance; qualifying expression will not be evaluated.and.. At line 78 I get this Warning:
Warning 2 Property 'SelectedCustomer' doesn't return a value on all code paths. A null reference exception could occur at run time when the result is used.
The program compiles and runs well, but i cant' undesrtand the reason for these warnings. Any Idea ?
1: Public Class Form1
2:
3: 'Form level members
4: Private objCustomers As New ArrayList
[code]....
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Jan 3, 2010
I tried this
Imports System.IO
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
If Directory.Exists("c: estDir1") Then
'shows message if testdir1 exist
[Code] .....
I am getting errors such as:
Exists is not a member of directory
CreateDirectory is not a member of directory....... and so on
How to remove these errors?
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Dec 28, 2009
Is there some way to get the declaring member order inside a class? For instance:
Public property Number1() as Integer
Public property Number2() as String
I need get the exact order. Maybe using reflection or something else
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Sep 27, 2011
i have a probleam with my homework . I try to do a sorting in listbox, but i got an error Sort is not the member ArrayDemo. I also highlight the line which i got error
Public Class Array
Dim strFriends(4) As String
Private Sub btnSortingArrays_Click(ByVal sender As System.Object, ByVal e As
[Code].....
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Mar 20, 2009
, I was wondering if it was possible to reference a member of a structure by using a string variable. Here's an example of what i'm talking about:
[Code]....
Now, I know that you would usually reference the value in any of the members by using the following (String1 in this case)
[Code]....
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Apr 29, 2012
I am writing a custom backup program and learning as I go, everything has been fine up to now. When I click a button the following is run:
Private Sub BtnCopyDir_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnCopyDir.Click
If My.Computer.FileSystem.DirectoryExists("C:TestDirectory") Then
[code].....
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Jun 18, 2011
I have text for example:11.12.2009 or 7.8.2004 and how to get three variables, a, b, c
a = 7
b = 8
c = 2004
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Apr 21, 2010
Is there any limit to the no. of handles assigned to an routine. Well actually my form form has about 80 controls and when ever the user press the enter key, focus must be to the next control. so can I handle all the 80 keydown events in one routine, or is there an better way.
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Sep 6, 2009
My windows application needs to raise an event in a COM callable assembly so unmanaged code can pick up on the event.I am sick of this. All the crazy tags required for COM callable is doing my head in.
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Jun 23, 2009
I'm using a com object in my vb net application. I'd imported the com library and everything is fine.But the object does not raise events, None. I need to know if there is some way to achieve that it works.
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Dec 28, 2009
I am adding a button on the form dynamically, and how to add click events for that but
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May 12, 2010
I'm relatively new to vb.net. I just created an simple Electronic Raffle web application via Visual Studio 2005. It's working just fine since it just basically returns a random winning entry queried from an SQL Server database. However, to make the raffle draw more "dramatic", I would like display random entries before actually displaying the winner. I tried creating a for-loop which displays random numbers before displaying the winning entry but only the end result (winning entry) is displayed.
I even tried to display an animated gif file then hide it again before displaying the winning entry but only the winning entry is displayed when I click on the "Draw Winning Entry" button.Is there a way to set the sequence of events in a web browser such that the program should display the image first then hide it after 5 seconds then display the winning entry afterwards?
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Oct 27, 2009
is there a form event that occurs before the load event in a winforms application? I have a winform app that can be run in batch mode and I don't want the form to load at all. Otherwise I could just hide it in the form load event but I figured there's probably a better way.
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Feb 12, 2011
I'm in the middle of a project, I've got the bulk of it working but I cannot work out how to get my variables to modify the SQL query properly, I'll try and explain. GUI has 5 search fields Q1, Q2, Q3, Q4 & Q5 with 4 checkboxes that denote AND / OR operators that need to be inserted into the query correctly. If they are all set to 'AND' it works fine. However if the user wants 'Q1 AND Q2 OR Q3' then it fails. If I hard code then I just user brackets ie '(Q1 AND Q2) Or Q3'. For some reason I seam incapable of working out the code to achieve this...
Code snippet:
'Check AND OR Checkbox and assign Operator
If Q1AND.Checked = True Then
Q1Op = "AND"
Else : Q1Op = "OR"
[Code] .....
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Sep 15, 2011
I am trying to create a program, where the user click a button and this will add a custom control and then drag and drop them on the form.
What I want to be able to do is add multiple controls (by clicking this button) and for them all to have the same events. So basically they can add as many as they like of this control and then click on it and drag it anywhere.I know in vb6 there was the use of the control index but I am not sure how to do this in Visual Studio 2005?
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Nov 18, 2009
I'm "cloning" objects in my code. For instance: objClone = objOriginal My question is: Does the assignment operator in VB.NET 1.1 do a member-by-member copy of the objOriginal to objClone or does objClone simply point as a reference to memory referenced by objOriginal?
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Apr 8, 2009
i have a datagridview in which i want to know which row is selected by mousedown or keydown.. so in both case i want to use only ONE subroutine which can give e.rowindex , e.colindex value of datagridview...
Example..
Private Sub xyz (s as sender, e as keydownaurguments, m as mousedownaurguments) handles keydown, mousedown
'\\ code
end sub
[Code].....
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Mar 10, 2010
I have a user control and a panel on it in Dock fill format. Now this is exposed for the user to add on the form. Till this point fine. Now the user sees lot of events for the user control, which I want to actually link up with the panel on the usercontrol, because that is where I want things to happen . Is there any solution to link up the events in few lines of code than calling each event separately? I am also looking to expose only few events than all the base control events.
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