Consider the following class:
[Code]...
In the Sub New(), technically you can pass in "Nothing" for one of the parameters, or string.empty for the string. My question is how do you force the class to not create itself? Oh yes and I know you technically are not supposed to use IsNothing() in .Net however "OrElse MyPar2 Is Nothing" generates an error.
E.g. I have a class:
Namespace Common
Public Class AClass
Public Class BClass
[code]....
How can I use BClass without saying AClass.BClass, I've see some existing code using this format, but I can't find the setting.
I am trying to set the class attribute of a list item on page load. Dim liItem As HtmlGenericControl = DirectCast(Page.FindControl("default"),HtmlGenericControl)liItem.Attributes.Add("class", "active")
This code doesn't work, not quite sure why.This is the error it is generating "NullReferenceException: Object reference not set to an instance of an object"
Given a simple class like this:
Public Class clsOB
Implements System.ComponentModel.INotifyPropertyChanged
Private _Frequency As Double
Private _Value As Double
Public Event PropertyChanged(ByVal sender As Object, ByVal e As
[Code] .....
And then I'd like to do something like this:
Dim
o As
New
clsOB(50, 30)
o = 31
I'm new to classes. In my Who wants to be a Millionaire application, I have a Lifeline class and I create three instances of it - FF, PAF and ATA (50/50, Phone a Friend and Ask the Audience). Something I do with a lifeline is put a cross over its logo, hence the need for a centrepoint property, which marks the centre of the cross on a form.
Public Class Lifeline
Private ptCentrePoint As Point
Public Property CentrePoint() As Point
Get
CentrePoint = ptCentrePoint
[Code] .....
What happens is that at the "Call Form2.DrawCross(Form2.CentrePoint)" line, the tooltip shows that the FF object's centrepoint property isn't set (as I thought it would be by " FF.CentrePoint = tmpPoint").
is there any trick (because I can't think of anything else ! ) to massively set all of the properties , of a user defined class , to their null values ? You see , I have a class called Apartment and it has a lot of properties (it only has properties , no methods or events , if that's important) and those properties are either strings , doubles or integers . I want each time I create a new instance of that class (a new apartment , that is) to automatically set those properties to their null values . That is all of the strings to be equal to "" and all of the numbers to be equal to 0 . Back in VB6 I could rely on VB6 to do this automatically , but now in VB .NET , whenever I create a new instance of a class , all the properties start with the value = Nothing . I know I can define every property in the class module like that : Public MyVariable As String = "" but I'd like to keep them as they are and set their null values directly whenever a new object of that class is created .
View 8 RepliesI am not seeing what I am doing wrong. To see what was being done, I changed the constructor values to "TEST", after the XML gets read in (I verified what the XML is), the class values are still stuck to "TEST". Any more Ideas? I am doing this process already in another class that works fine, neither me nor some co-workers could find the difference.[code]...
View 1 RepliesI know that an interface can contain another interface within it.But;can a class contain another class within it?Can an interface contain another interface within it?
View 9 RepliesDoes anyone know how to get my class name and method name dropdown lists again? It's the dropdown lists that are usually above the code. It's just a setting but i can't seem to find it. I don't want to reset my setting btw. I shouldn't have to.
View 2 RepliesI'm having a problem setting the SelectedIndex property of two comboboxes.
There names are,
LateralStartComboBox
LateralEndComboBox
When I run the code listed below, both of the comboboxes display list item number 6. No matter how I try to set the selectedindex their text matches. [Code]
I am attempting to use the System.Management.ManagementObjectSearcher class in VS 2005 (see below) but get a error message for both the ManagementObjectSearcher class and queryObj As ManagementObject - Type ManagementObjectfSearcher is not defined and Type ManagementObject is not defined. how do I use this class in Visual Studio 2005?
Dim searcher As New System.Management.ManagementObjectSearcher( _
"rootCIMV2", _
"SELECT * FROM Win32_ComputerSystemProduct")
[code]....
I have a problem when i opened a picture that
size image < size picture box
How can make the background of the picture box become an image too because my coding was to get the pixel from width and height picture box.. When I found the none image property, vb will show the error.. said coordinate(x,y) was null. It can be illustrated like on the picture above.
Sometimes I will used it when:
picture properties - size mode = center image
So the picture will found at center height and width.. and the background will surround it. Sometimes I used it after rotating the picture.. The problem occur when the picture get rotate for 45 degree. I am taking all point corners of the image and rotating it. So the picture will create 4 triangle at the corners..
I have a form that has two text boxs User ID and password. My question user must move cursor to the User ID field. But it should default to that field as that is the only option. How to do it in .net?
View 3 Repliesi have a program with MDI parent and child. initially, the program will call a child e.g. ChildMain. on this child form, 2 processes are run. the 2nd is ran on a backgroundworker. the backgroundworkder in created through code. the process in the background worker is to create another childform but i'm having problem setting the MDIParent of this child form since VS is saying some sort of cross-thread issue.
[code]...
Im using Visual studio 2005 and I want to push a button which opens either olderbrowserdialog or openfiledialog(which ever works better) and select a picture when I Push Ok the picture I selected becomes the backround image of the form does anybody have idea on how to do this
View 3 RepliesIf you can set the height of a panel at run time
Me.Panel1.Height = 3 What is the correct syntax for setting maximum size (height)? Tried this several ways and been searching. I know this is simple.
Me.Panel1.MaximumSize.Height = 512
I have a VB2005 project that displays 16 pictureboxes in a 4x4 grid which display CD album covers. In VB6 I could set up a control array i.e. picCD(0) to picCD(15), which made drawing the CD covers a snap. How do I accomplish this in VB2005?
It seems extremely cumbersome to have code like: If Len(path(0)) < 1 Then
If Not IsNothing(PictureBox1.Image) Then
PictureBox1.Image.Dispose()
PictureBox1.Image = Nothing
End If
[Code] .....
I have done some searching, but am still having trouble trying to set the browsable attribute of property to false at runtime in order to hide in the properties grid control (based on certain conditions).
View 9 RepliesI tried using keypress event to set the focus to another control after selecting record from combobox and pressing the enter key but it is not working.
View 2 Replieshow to add the Uninstall option in the Start--> Programs, during setup and deployment of an application?
View 4 RepliesWhat i am trying to achieve is relativly simple but for some reason i cannot get it to work. I would like on form loads for the contents of a textbox to set the value of a parameter @CustID and the Stored Procedure to be used to return the result into a DataGridView.My datagrdview1.datasource= "StoredProcedure1" but how to i set the parameter value and tell my app to execute.
View 29 RepliesSetting a hanging indent using full word automation. I am using word 2003 and vb 2005. I am inserting paragraphs in the document and I am having some difficulty getting the whole paragraph to indent.
View 8 RepliesAs some of you are aware of, I am fairly new to VB.NET. I am trying to learn as much as I can. I have a textbox which is set to multiline. It's setup to accept a maximum of 500 characters (10 lines of 50). First of all, since it's size is fixed, how can I remove the right bar on the left as im not using it (the scrolling bar).
#2, once a user click on a button, I disable the textbox and display the text. I can set the background color, however it looks like when the textbox is disabled, text is gray and can't be changed. A fix I found is to use a label and hide the textbox, but are there any easier way ?
I am trying to create a setup file which would automatically install a link to the executable in the User's Desktop and Startup--> Program. However despite following all the steps in the right order I do not see any short cut in the desktop and Start -> Program.
View 4 Repliesis it possible to set a value of an item, for example: a textbox1.text = Empty.String at design time?
View 5 RepliesI need help and wondering if you can help me to get my first project...it's a hobby and wondering if you can get me code for this so i can see how it does it* Evaluate( ) Prints the evaluation of the hand to the evaluation Label.
o If IsFlush( ), prints "flush; "
o calls SetPipArray( )
o Uses a For Loop to go through pipArray. For each element, uses a Select Case statement to
[code]....
I have two classes; one is a data class which contains routines to handle data and the second is a utility class which contains useful routines which can be used again and again. I have come across a problem. Some of my routines in the utility class use routines in my data class and now I want to use some of my utility routines in my data class. I tried this in a service and the service just would not start. After commenting out code I realised it was because I was making a declaration in the utility class for the data class and in the data class making a declaration of the utility class.
I understand that this is now causing looping but is there a different way to do what I want. If not I would need to have two copies of routines in both classes.
use API return a handle by FindWindow
Public Class Form1
Private Shared Function FindWindow( _
ByVal lpClassName As String, _
ByVal lpWindowName As String) As IntPtr
End Function
'....
End Class
My question, what value should be passed into Function FindWindow(lpClassName, vbnullstring)? Can I use "Form1"?
this.label39.Font = new System.Drawing.Font("Tahoma", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
this.label39.Location = new System.Drawing.Point(37, 303);
this.label39.ForeColor = System.Drawing.Color.Black;
[code].....
In our projects we use setting variables to store user setting for the applications. Moreover, with every latest version of the applications, we upgrade these variables to retain user settings.Normally, this works fine, but recently one of my end user reported an error i.e.Configuration System failed to initialize". The error is related to user.config file. Therefore we requested the user to send us his file.After received the folder, we noticed that it contains 3 files (3begfjb.newcfg,3begfjb.tmp and user. config). 3begfjb.tmp is an empty file, while 3begfjb.newcfg and user.config are identical files. We tried to open these files but the data in user.config isn't proper xml rather its unreadable formatted file.Do any you guys had experienced this sort of issue or any ideas how and what may have created these files and corrupted user.config file.
View 3 Replies