This relates to vb.net on vs2008 I have a form (in actual fact many forms) in which the fields are bound to the public properties of class I have created. For example let say it is a customer class object oCustomer of type clsCustomer.
In the Set section of property declaration I use the NotifyPropertyChanged("propertyname") command like this
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I'm working on a simple base form in which all the other forms in the project will inherit. This base form only adds 5 properties (at the moment) dealing with painting a gradient background. The problem I'm facing right now is when I change a property on Form1 (the test form) and click run it doesn't show that change. I also checked the .designer.vb file and when I make a change it's not added to the code behind file, I'm at a loss right now to why.
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I am working on a project that uses lots of custom class objects.Before starting work on real project, I tested the object behaviour on a temporary project. And find that if i add the object to a list and combobox and then make any change to the object property then it reflects in list and combobox.But after using the same process in real project the change does not reflect. Why?Also, how can i update object property placed in the combobox.
for eg.
Class X has property id and name
created objX of type Class X and set id=1 and name='All'
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I have an object with a GUI interface. This has properties and methods. When this object is modified by anyone, on any machine, all other users should reflect the change, without specifically asking for a refresh. How can I achieve this? Imagine that the Object is static across users. I need complete details on going about it
View 2 RepliesI have below codes on how to notify forms of data change.
If I were to convert it to exe, how do i then notify the multiple instances of this application of a data change?
Public Class Form1
' use the WithEvents keyword in that the events of frm2 can be handled using the Handles keyword
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I noticed that when the app closed the icon remained on the taskbar until the mouse was hovered over it, so added this:-
If Not AlarmClockNotify Is Nothing Then
AlarmClockNotify.Dispose()
End If
.. and that did the job.
Then I noticed that if the balloon was showing at the time the app was closed, the icon went - but the balloon stayed, so added this:-
If Not AlarmClockNotify Is Nothing Then
AlarmClockNotify.Visible = False
AlarmClockNotify.Visible = True
AlarmClockNotify.Dispose()
End If
and everything worked fine until the app was closed WITHOUT the icon showing (only dislays if an alarm is pending in the next x days) - then it throws and 'object reference not set to an instance of an object' - odd because it passed straight through the 'not is nothing' If statement.
I inherits textbox Control and I added some new properties to it .one of these properties value i want it to change it's value in desgin time when i change Name property of the new textbox
Public Class NewTextBox
Inherits TextBox
Private _txtSubName As String = String.Empty
That is the property for set or get SubstringName of Textbox
Public Property SubName() As String
Get
Return _txtSubName[code].....
that's the property i want to change it's value when i change Name property of the control.i tried to overrides Name property but it's not overridable also i trieds to overloads it but it doesn't work in desgin time.Here is something i tried but it's wronge.
Private _txtName As String = ""
Public Overloads Property Name() As String
Get[code]......
.NET developing and have a simple question, i've been stuck on this for a while and searched many forums first with no solution so i'm posting myself. In VB for excel i've used Screenupdating=false to disable the screen updating however now i'm creating a visual studio 2010 windows forms application and its not showing up as a property. Here's the code i've tried.
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I have a question how can I change the BackColor of all forms at runtime?
I tried to loop through each form but didn't work for me
I want to click on the button, then change the itself position
the visual studio prompt me that is a public property, and the type is double. Why I cannot change the value? And it does not provide any method let me change the top property, so how I can change the property?
<Button Content="Button" Grid.Column="1" Height="23" HorizontalAlignment="Left" Margin="0,0,0,0" Name="Button1" VerticalAlignment="Top" Width="75" Grid.Row="1" />
MsgBox(Button1.Margin.Top)
Button1.Margin.Top = 10
I have a qeustion where i made a function that changes the property value of an object. the objects + alias are stored in an array (Objects()) , if the var (NewValue) has a value then it checks the property type and converts the Newvalue and inputs it.
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Want to change a property of a user in Active Directory programatically. I know I need to use DirectoryServices but I keep getting referral errors.
1. I want to connect to the directory an get the property first.
2. I will then use a evaluative expression to find out if step 3 is necessary 3. Want to change ths property
However, I want to run this from client machines so they won't have permission to modify the schema so I created a new users, is it possible to authenticate with one user and change another's?
Tutorials don't seem to show specification of the user the are changing the context user.
Using a plugin architecture, i created a Form Class that holds the Mdi Form. it has menustrip, toolstrip and statusstrip.
child forms are created as class and are loaded into the Mdi Form at runtime.
using interface, i was able to execute subs and functions of a child in the Mdi Form and vice versa.
now i need to change property values.. to be exact, i need to change the enabled property of the toolstrip buttons depending on which child form is activated using the form_activated event of the child form.
the problem i now have is how to change the property of the toolstrip item in the Mdi Form.. should i be using interface on this as well by creating subs in the interface and have the Mdi Form implement this interface?
is it possible to make this:
TextBox1.Enabled = False
TextBox2.Enabled = False
TextBox3.Enabled = False
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I want to give the user the ability to modify the font characteristics of a textbox on a form, using buttons. In the button click_event, I can successfully have the user change the font color to red directly:
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(using VB.Net 2008) I'm inheriting from a class, and overriding one of the properties. However, the original property has public get & set, whereas I want to make it read-only in my derived class, because the property in my derived class is already determined by other factors. But it appears I can't change the access level of any overridden method. Is this possible?
The closest analogy I came up with is suppose you have a Person class, with a get/set Address property. Now suppose you inherit Child from Person, and Child will have a new Parent property. Say you want the Child's Address property to be readonly, because it will simply return the address of Parent. Even if you can override the Address property, you can't make the Set non-public. The best I can do is make it throw an exception but that's obviously misleading during design time.
I am inheriting my own DataGridView (say MyDataGridView) from the standard DataGridView control. What I want is that certain properties of MyDataGridView should have a different default value than what its base have. For example, AllowUserToAddRows, AllowUserToDeleteRows, AllowUserToResizeRows properties should have the default values of False; so that when I drag MyDataGridView into a form in the IDE, the default values shown in the properties grid should be False. Later on, if I want to change them to True from the grid, they will be set accordingly.
View 1 RepliesI want to change PrintPreviewControl 's property in run time.
for example change paper size to A4?
or change land scape ?
On form1 I put a picturebox from the toolbox.[code]Is it possible to set picturebox.visible=true of the inherited picturebox?
View 1 RepliesI have the following code, and I want it to act as a stopwatch.
Dim spn As New TimeSpan(0, 0, 0)
Private Sub elapsedtime_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles elapsedtime.Tick
spn = spn.Add(New TimeSpan(0, 0, 1))
Label6.Text = String.Format("{1}:{2}", spn.Hours, spn.Minutes, spn.Seconds)
End Sub
However, when the "stopwatch" ticks, the time is shown like this - 0:3, 2:9, etc. How can I change it so that when the seconds are in the single digits, it shows the time like a normal clock (4:05, 2:09, etc.)?
How can I change the locked property of the GroupBOX and Panel?
View 16 RepliesI am creating an login page connected to a database. I am using access ODB. the problem is, if the user makes an wrong input, and the invalid data message box appeared, when typing the data again, and press ok, the following exeption occured:Not allowed to change the 'ConnectionString' property. The connection's current state is open.[code]
View 3 RepliesI am trying to allow changes to our database through a timecard program. We use and Image database and I am using VS 2008. I am getting the error: (MDMDA) Unable to change property. The trouble shooting tip tell me "check the error code property of the exception to determine the HRESULT returned by the COM object." The error line is in bold.
If Not Trim(frmMantime.txtFunc1.Text) = "" And Not frmMantime.txtRec1.Text = "" Then
'Update Record
lngRecordNumber = frmMantime.txtRec1.Text
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I place a Background Image on my main form to a BMP file, On-top of the Background I have buttons, and Labels. When I execute the code, the labels (which are supposed to be WHITE) along with the text on the buttons is see-through, I can't get it to stay WHITE and not display whatever is behind the form. here is the examples I have, this is what it's SUPPOSED to look like: http:[url].....
This is what it DOES look like: http:[url].....
Does anybody use the Tag property of controls & forms? If so, what for?
View 6 RepliesHow do I transfer the value of a variable and place it into the text property of an object on form load?
View 2 RepliesI have a Windows Form that contains a DataGridView. The DataGridView ReadOnly property is set to TRUE. The DataGridView as 3 columns. I would like to make the cells edible (ReadOnly=False) when the RowHeader is clicked. I thought that the following code would do it, but when I click on a RowHeader and then click in one of the cells in that row, the cell is still ReadOnly.
Private Sub dgvData_RowHeaderMouseClick(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewCellMouseEventArgs) Handles dgvData.RowHeaderMouseClick
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I am in the process of creating a relatively simple "yahtzee" game for a final class project. I have a "Roll the dice" button on my form that when clicked chooses 4 random numbers 1-6. Each number is a seperate "dice", each of the 4 pictureBoxes is meant to represent a seperate dice. A series of If then statements is being used for each picture box so that for example The random number is 1, a image of a dice facing the 1 side is displayed.[code]...
View 5 Replieshow would i go about changing the text property of a button when clicked. Im using panels to switch between what the form shows but when i click the button to switch panels i want the text of the button to change but i cant figure out what property to change and how to go about doing it.
View 2 RepliesI have a class created for use with the PropertyGrid control in a VB.Net application. One of the properties of the class is:
Private _someProp As String
<Browsable(True), _
BindableAttribute(False), _
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