I have this code that's suppose to override the form closing event, It fires off sucessfully however doesn't prevent the form from closing.
Private Sub Form_Close(ByVal sender As Object, ByVal e As System.ComponentModel.CancelEventArgs) Handles MyBase.Closing
Me.Hide()
e.Cancel = True
End Sub
I have to two forms. Form one has several check boxes and when a button is pressed, a second form is opened and certain functions are ran based on which check boxes are selected.The problem is that the second form doesn't show until all of the functions are done.I decided to use the Form's Activated event, which works fine. However, the event fires every time the form comes into focus.Is there anyway to override the event and make it only fire once?
View 1 RepliesI'm trying to validate a few things in a form I'm building. It has a datagrid with clients info (taken from an access database) and a few textboxes where the user can type some search criteria. The thing is that those same textboxes are used to add new clients to the database and to modify a client's information if one from the datagrid is selected, so I made it that the buttons to insert and modify clients are disabled on load and thenevery time the text on a textbox changes ("TextChanged" event) they become enabled. So far so good. But then I wanted to make it so when a client from the datagrid is selected both buttons become disabled again until the text on a textbox changes (to make sure they're adding a different client and not the same one that was
selected).
I tried using the CellClick event from the datagrid to disable the buttons, but since every time a client is selected from the datagrid the info is shown on the textboxes, this triggers the TextChanged event too, and the buttons become available.So, is there a way I can tell the TextChanged event not to be triggered when the CellClick event occurs?
I have a multi-form application that closes one form, using form.close() and shows another, using form.showdialog().In one of this forms, I have a 3 tabs, and I'm looking for to printing them one by one.I can print them easily but when the print_page event ends, the form that just printed closes. It also happens when I just hit Cancel on the printdialog.
Private Sub bttnImprimir1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles bttnImprimir1.Click
Dim pdialog As PrintDialog = New PrintDialog
pdialog.Document = PrintDocument 'PrintDialog associate with PrintDocument.[code].....
Going around in circles here. I have an Exit button (Barbuttonitem6) on my form and would like the FormClosing event to handle this. The code works fine for the FormClosing event but when i try to call the Formclosing event from Barbuttonitem6, it does not work (The form does not close if i choose Yes to save or No)
Public Sub BarButtonItem6_ItemClick(ByVal sender As System.Object, ByVal e As DevExpress.XtraBars.ItemClickEventArgs) Handles BarButtonItem6.ItemClick
[code].....
okay i have this code
Private Sub Form_OpenGradeBook_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
[code].....
Based on our tests primarily done in VB.NET in VS2010 it seems that when you close a WinForm the "RowValidating" event of the DataGridView on that form behaves differently depending on whether the form is MODAL or NON-MODAL. What we did was open the form (MODAL and NONMODAL) and changed a value of a cell and then immediately clicked the "X" to close the form. It looks like the "RowValidating" event DOESN'T fire if the grid is on a MODAL form but it DOES fire when the grid is on a NON-MODAL form. We can't figure out why that is... Is this a known bug in .NET?
[Code]...
Dim frm As Form
For Each frm In Forms
Set frm = Nothing
Next frm
The above code is what I used in VB6 to close all forms associated with my programs before my program closed. I have been searching for information on how to make sure all forms are closed when closing a VB2008 program.
I have seen info on using the Project Property Shutdown mode When startup form closes and I currently have this set.
Is this all that is really necessary? Will the garbage disposal close everything else to free up RAM?
Also, if I have several forms open and want to close all from the main form without closing each one individually, what is the best approach? Is there a collection like in VB6, go through the collection, compare it to the name of the main form and close it if it is not the main form?
I have a WinForms application (OwnerForm) with some UserControl. When textbox of UserControl is changed, I want to filter content of a OwnerForm. But how can I make it? I don't want to specify OwnerForm inside the user control. I know a solution to add manually handlers for MyUserControl.tb.TextChanged to some functions on a owner form, but I think it's bad way. I'll prefer to have overridable functions, but I can't imagine how to do it.
View 5 RepliesI would like to shadow/override an event in VB.NET v2
I need to do it, because I need to implement a interface, let's name it IVisibleChanged, on the custom objects that does not have defined this event, and on the objects that already have defined this event (custom Button, by eg.)[code]...
I would like to shadow/override an event in VB.NET. I do it only because I have to implement in this object an interface, that contains the same event like the base object itself, and I need to keep this base event as is it without modification nor supplementary event additions.How can I do it?
Public Shadows Event VisibleChanged As EventHandler Implements IVisibleChanged
So, I would like to implement a interface that contains VisibleChanged event, but to keep functional the myBase VisibleChanged event too.
[code].....
short question: What's better?
Form KeyDown event vb Private Sub MainForm_KeyDown(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles Me.KeyDown End Sub
Override OnKeyDown
vb Protected Overrides Sub OnKeyDown(ByVal e As System.Windows.Forms.KeyEventArgs) MyBase.OnKeyDown(e) End Sub
Ok, I've been searching all over the web for an answer to this and I'm getting nowhere. I've found several examples and tried code translators, but they either fail to compile at all (syntax is wrong) or fail to solve the problem. Here is what I am up against:
I am trying to implement a service object class for the POS for .NET library using VB9. Specifically, the BillDispenser class. I define my class and inherit from Microsoft.PointOfService.BillDispenser. As normal, it creates stubs for all the MustOverride (abstract) properties and methods that I need to override (I love that), EXCEPT for the DirectIOEvent. Apparently this event is defined as abstract in the POSCommon base class, but VB doesn't generate a stub for it.
No compile errors are generated from not defining it, but I get the following runtime error as soon as my unit test attempts to load the dll[code]...
I'm using ASP.Net 2.0. I have a custom control that is inherits from a 3rd-party vendor's control. I'm trying to override the Render method. [code] What I need is that under certain situations I want to be able to render a Button instead of the original control.But I want the Button to have the same client Id as the control so that I can use javascript to manipulate it.How do I assign a clientid to the button?
View 1 RepliesWhen editing vb.net forms code in vs2008, how do I select base class events that I want to override? In vs2003 there was a list of overridables in the drop down list but now that list is missing?
View 4 RepliesBasically, what I want to do is create a new control called EncryptedPictureBox. The image path I would be loading into ImageLocation would be the path of a 512 bit encrypted image. Normally if I load this type of file, it will not display. So I want to override Load() so that I can write the encrypted image to a stream, decrypt it, and then display the stream. I'm trying to save processing time so I don't have to grab the encrypted image, save it to disk as a decrypted image, then display it, then when done, delete the decrypted image from disk.
View 11 RepliesCorrect me if i'm wrong, but i believe most (if not all) classes in the CLR that raise events raise those events from protected methods, for example Form.OnMouseDown... so... In a subclass, when would you want to override the "OnXyzMethod" instead of simple adding an event handler like Visual Studio does by default when you want to handle a controls event?
View 2 RepliesAt the moment I have the following Command class:
Public Class SubscribeCommand
Implements ICommand
Private ReadOnly _vm As MainWindowViewModel
Public Sub New(ByVal vm As MainWindowViewModel)
_vm = vm
End Sub
[Code]...
In a tutorial i read, you have to implement add {} and remove {} for the canExecuteChanged-Event. But how can i do that, with vb.net?
I have the following code to close a form which is a child. The problem is that when it closes, it closes the MDI parent too.
Private Sub frmTransaction_Closing(ByVal sender As Object, ByVal e As System.ComponentModel.CancelEventArgs) Handles MyBase.Closing
If ListView1.Items.Count >= 1 Then
[Code]....
I want to modify this code or replace it. I want to override the the textbox's textchanged event in a user control.
Protected Overrides Sub OnTextChanged(ByVal e As System.Windows.Forms.ItemChangedEventArgs)
MyBase.OnTextChanged(e)
End Sub
[code]......
I want it so when the "x" button is clicked a message box will appear saying "Are you sure you want to exit?" then if "yes" it closes and if "NO" it stays open. so my code is:
Dim a As Integer
a = MessageBox.Show("Are you sure you want to exit?", _
"Vice Versa 1.0", _
CODE:...................
This should work, no? When i debug my project clicking "no" still exits my program. Is this just because it's in debug mode or am i missing something here?
Also no warnings or errors. Is there a way i can make my game pause when the message box shows? I only have it working to if the users presses "p" on keyboard. But also want game paused when message box shows, without pressing "p"
It seems like I can't set the id or name of the form in my masterpage. [it's always "aspnetForm"]
Is there a way to override the uniqueID property of form?
I tried to create a class and inherit from htmlform, but then i can't register it on my mastrepage, [unknown server tag ... ]
im registering it like this
<%@ Register TagPrefix="cf" Namespace="Framework.BaseForm" %>
I'm trying to save some layouts from DevExpress Grid Controls so that users can change the layouts and reload them in at a later use of the control.
My question is this for speed issues I am loading the control via a user control inside of a form. Now my problem is I am creating the control by adding an instance of the control to a panel control inside of a tabbed group control when the tab is made visible and then clearing the control when the control is hidden.
If ClaimsGridPanelControl.Visible = True Then
ClaimsGridPanelControl.Controls.Add(New RXClaimsGridControl(ClaimsBindingSource))
Else
ClaimsGridPanelControl.Controls.Clear()
End If
So inside of the RxClaimGridControl I need to call a SaveLayout method when I am clearing the control. But there is no event, at least that I can find, that triggers when a usercontrol is removed/closed/hidden.
My thoughts for handling the .Clear() would be to raise an event in the parent control and then to handle that event inside of the user control.
Is there some event that I am missing in regards to the removal/closing/hiding of a user control, or is there a better way to do this.
I am working on a football simulation. I'm writing the code when a quarter or half ends. If any of you ever played Madden Football you know that when the time reaches zero the play calling screen disappears. This is exactly what I am trying to do. The play calling screen in my case is a dialog controlled by the main game screen (the main form controlling most of the game). I use the .ShowDialog event to display it. What I want to do is close this dialog on a tick event.
I'm not sure how to access this dialog if it was created as a local variable. I assume it's like finding any other control that was dynamically generated at run-time but I can't wrap my head around the proper syntax. Once I get the dialog in the tick event I want the dialog to close and return all control to the main game screen. I've never tried to close a dialog without the user clicking a button on the dialog itself. This is different because the parent control is closing the dialog with its own event (Tick).
So I am trying to make a program where the user is limited in moving the mouse to a form. I still want the user to see whats going on behind the form but not be able to click on anything but my form.
I tried using this
Cursor.Clip = Me.RectangleToScreen(Me.ClientRectangle)
The problem is that if the user clicks in certain spots on the titlebar...the mouse is unlocked. The machines this is going on has a ball type of mouse so if you scroll fast and click fast enough...it can also unlock.
Alright, I have a vb6 LEGACY application and new Functionality (Form) written in c#. I have a VB.NET COM Class as a wrapper. I can launch the .NET Form just fine. THe problem I am having is closing the .net form from vb6.
Example:
In VB6, I have something like this:
CODE:
But it does not work becuase frmViewer is Nothing for some reason. how I should close the .NET form that was launched from VB6?
I have a parent form that has a list of items and each item has a unique ID. The user can open one or many of the items in a child form (it is set up in a tabbed MDI), but it can only open one instance of each item at a time.
In the parent form, I was going to make a collection (or something like that, maybe there is a better way) to keep track of which items are open in the child forms. I need to know when each child is closed so that it can be removed from the collection and reopened at a later time. I was thinking that when the child form closes, it somehow does something (like raise an event) that tells the parent form to remove the unique ID from the list of current open child forms.
My questions are, is this a good way to do this and I am pretty sure I would use the form closed event in the child form to update that parent form, but as well, I didn't know if this is the best way of handling it.
If raising the event is a good way, are some examples on how to do it out there? I found some for controls, but not while the form is closing/closed.
I am using VB.NET for Windows applications. What is the difference between Load event,Activate event and Enter event in the Form and in which order the above event is executed.
View 2 RepliesI am working on a project that has the user building scrapbook pages through several different forms. When the user selects something a presses a button I have the information about the selection load to a list box which is on a CheckoutForm. One of the options I have is for the user to save what they have made (this includes the information in the list boxes) and return to a previous form to build another page. I have been trying to use the Me.Close() but it does not save the information and using Me.Hide() displays the wrong elements on the forms.
View 5 Repliesi have a parent form which is having a grid view. In the KeyDown event of the grid view i am calling a child form. If the user closed the child form, my application should close both the parent form and child form. What i have done is, i declared a boolean in the child form and passed the boolean value to parent. May be the code below will give the picture of what i am trying to do.
Private Sub gvJournalEntryDet_KeyDown(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles gvJournalEntryDet.KeyDown