I've recently run into an unexplainable issue regarding a windows form application I am working on. I've managed to isolate the issue to a single line of code whereby a single TabPage is removed from a TabControl, leaving no tabs left in the TabControl's collection. What happens next is a bit mystifying: my application proceeds to enter a state in which the main form's Activate event is fired subsequently followed by its Deactivate event. As a result, no matter where I click on the form, the application will activate for a split-second then immediately deactivate itself, thereby causing me to be unable to interact with any other GUI controls on the form. I thought maybe another thread is trying to interact with the deleted tab object, but the tab is created and destroyed on the same main gui thread. Does anyone have any insight that may point me in at least a new direction? Stepping through the debugger to the point in code where the tab is removed does not cause any exception to get thrown, so at first glance there doesn't appear to be any coding issues going on (although I would not be surprised that is actually the case!).
I am already overriding the SnapLines property in my ControlDesigner-derived class to manually forward out various snaplines from the child controls of my control -- the text baseline (pink) snap from the labels and comboboxes; the text inset snap from the labels; the top, bottom, left and right snaplines from the comboboxes. Those snaplines activate when the control itself is moved around on the form and when other controls are moved around it.
What I need is the ability to tell the designer to activate the snaplines and then deactivate them while I'm doing an internal move or resize of the underlying controls.My comboboxes are resizable through overrides of OnMouseDragBegin, OnMouseDragMove, and OnMouseDragEnd in my control designer. The magic bullet I'm looking for is something I can call in Begin to tell the designer to show the snaplines and something in End to tell it to stop.
Allowing people to resize and move the internal controls at design time is kind of useless if they don't show snaplines for each other or for external controls.As with stuff like this, it's incredibly hard to search for. I've found one post on a forum where someone asked this exact question that had (of course) no responses. That's about it.
I'm trying to make my application become the active window if it currently isn't as soon as the mouse enters the main form of the application (so there is no need to click the title bar of form itself to make the window the currently active one if it's not).
It only sorta/kinda work .... I have to enter the form with the mouse 3-4-5-6-maybe 7 times ... then the window finally becomes the active one.
I know the MouseEnter event is firing each time the mouse enters the app, but the main window isn't becoming active most of the time.
Private Sub frmMain_MouseEnter(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.MouseEnter rtbStatus.AppendText("Just got a frmMain.MouseEnter event" & vbCrLf)
I'm quite new to vb.net and I was trying to develope something that can activate/deactivate the Optical reader at startup, so I wrote:
but obviously it's not that simple, I read I need registry permission not to have access denied to the specified key, I imported the system.security.permission namespace and I tried some constructors but without any results...anyone can point me to the right procedure?
I am creating a web browser in VB 2010. I have a search box, and I want to make it so that when I press enter in the text box, it searches. [code] The problem with this is that when I press enter, there is this annoying "beep". I don't know where this comes from. The only thing I can think of doing is making the event activate the search button, but I don't know how to do that either. How can I fix this?
I am attempting to create a timer that will activate a tick event every 1 second until stopped by an "If" statement. The tick event should then drive a clock measuring time in units of hours, minutes and seconds. The if statements handle the time readout, timer stop and activate another form after a set number of hours have elapsed. I have tried several different methods and while my application is running, it does not add increments to the integers representing the time units, refresh the displayed time units, or perform any of the timer related functions. I assume the cause is that I just don't know as much as I think I do (which isn't much)
Here is the applicable code:
Imports Microsoft.VisualBasic.ApplicationServices Imports System.IO Public Class SessionManager
I've been having a problem setting certain items in a listbox as checked when the form is loaded. I have tried putting the code in the form_activate, form_load, and form_shown events and each still crashes when it encounters:
I use the "NodeMouseClick" event to activate my sub function when I select a single node. But the event occurs also when I click on the "plus" simbol NEAR the node, to open it.Is it possible to activate the event only when I click on a node and not when I open it?I hope to have well explained my problem.
I am trying to create a winform that will allow me to close when the form either loses focus or deavtivate. When I do Me.Show, it will call the deactivate? Is that right or is weird? The way took it was it fires when it either looses focus or is no longer the active form.
Also it seem like I have to click the form in order for it to work right. I tried Me.focus and that does work the way I expected.
Then I have an update button and when the user drops down the list he/she can select between Cancelled/Processed/Failed. I want to be able to grey out or disable Processed and Failed, so that when the user updates the field he/she can ONLY update with the Cancelled option ONLY.
How do you deactivate the ContextMenuStrip when you right click your mouse. Because I have a checkbox that the ContextMenuStrip will not display if it is not check.. If it is check, the ContextMenuStrip will be activate again.
This is a non-MDI windows application. I have a home form containing a panel named Panel1 and two buttons btnForm1 and btnForm2. Clicking btnForm1 and btnForm2 opens up Form1 and Form2 respectively in Panel1. Before a form is opened in Panel1, all opened forms in Panel1 are cleared. The code follows:[code...]
In which events should the above lines be written? In MDI apps this could have been accomplished by including them in Form_Activated and Form_Deactivate events respectively.
But here neither Activated nor Deactivate events fire when you open forms in frmHome.Panel1. Instead of Activated and Deactivate you can use Form_Load an Form_FormClosed events but they will only merge/unmerge menus if existing forms are closed before opening a new form in the panel.
But as I sometimes need forms to be opened and closed keeping existing forms opened, using these events won't fulfill the task. Even the GotFocus and LostFocus events won't work. So I want Activated and Deactivate events to be fired or some other means by which the menus and toolstrips can be merged/unmerged when the form gains/looses focus respectively.
I just want to ask why my KeyPress event is apparently not working. What I want is that when I press the letter m, the selectedindex property of my listboxes would change. Here is the code;
Select Case Asc(e.KeyChar) Case 13 Try tray.ListBox1.SelectedIndex = tray.ListBox1.SelectedIndex + 1
I also want to know what the "e.handled = true" is statement for. I set the KeyPreview property of my form to false and true but it's not working as well. the KeyPress event should be triggered regardless of the control within the form that is in focus.
I have an object Order with a simple event, Public Event ErrorOccurred(ByVal msg As String)that I raise in the constructor like so when an order cannot be found (along w/setting a boolean error flag:
RaiseEvent ErrorOccurred("This order does not exist in the database.") [Error] = True
I have a webform subscribed to the order's ErrorOccurred event:
Public WithEvents o As New Order
and I have an error handler method on the form:
Private Sub OnErrorOccurred(ByVal msg As String) Handles o.ErrorOccurred litMsg.Text = "<p class=""error-confirm"">" & msg & "</p>" End Sub
When a textbox is changed, it autoposts back to the page and employs the following logic:
Private Sub txtOrderID_TextChanged(ByVal sender As Object,_ ByVal e As System.EventArgs) Handles txtOrderID.TextChanged If IsNumeric(txtOrderID.Text) Then
When there is an error (when the Else logic is run), everything performs as expected except the event does not fire. However, since the Error flag is set to true, it means the event MUST have fired, since that line executes AFTER the RaiseEvent line. I've tried everything I can think of, but I cannot figure out what could be wrong. I have events strewn everywhere in my project and they all work well using virtually the same structure.
I have a form with contextmenu where you can get the menu items on shockwave. I uses the menu items event to get the method of working when clicking them on shockwave by using right-mouse button. When I debug the project and when I clicked on testmenu item event, nothing have happens.
Form Public Class Form1 Private Sub testmenu_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles testmenu.Click MessageBox.Show("this is the test!") End Sub End Class
why it doesn't do anything when I click on testmenu item event??
I need to create event handler for Outlook event 'item send'. This is to capture the event before email get actually sent. I could generate this event handler in C# within seconds but having problem to do it in VB. Any translation online
I am having problems trying to get a rowcommand event to fire in a gridview. The code is below. <asp:GridView ID="GridViewProducts" runat="server" AutoGenerateColumns="False" BackColor="White" BorderColor="#999999" BorderStyle="Solid" BorderWidth="1px" CellPadding="5" CellSpacing="1" DataKeyNames="Pkey" DataSourceID="SqlDataSourceProducts" ForeColor="Black" GridLines="Vertical"> <FooterStyle BackColor="#CCCCCC" /> <PagerSettings PageButtonCount="20" /> [Code] .....
im having a problem i have a startup form now when it load its check the date and check the date that comes from the database now i got i want after the first try now when i try to log out (after log out click the startup form show) and the code does not execute in the startup_load event i use me.hide to close my startup form after login.. is this the problem thats why after 2nd try it does not execute my startup_load event how can i resolve that i use me.dispose but it close all my program..
I've spent quite a while searching this problem, there are some other similar threads online but none have helped me fix it.I have a GridView with an ImageButton within it, the imagebutton has an OnClick function but that event is never reached when it is clicked, below is my gridview:
In my windows app i have a button which is only visible when a user selects a certain value on a DropDownList. For some reason the button does not work when i click on itI've enabled the button on page load and it works, however when i choose the value on the Dropdownlist the button does not work.
Protected Sub DropDownList4_SelectedIndexChanged(ByVal sender As Object, ByVal e As EventArgs) Handles DropDownList4.SelectedIndexChanged If DropDownList4.SelectedValue = "Yes" Then
Visual Studio 2008, VB.NET, .NET Framework 3.5. Development Machine Vista Business. Problem occurs in Vista, Windows 7. It does not occur on XP. Others involved: Bennet-Tec Tlist tree control, Farpoint Spread for Winforms 5 spreadsheet control, ADO.NET with Access Database. Message issued:
For speed, I've decided to use temporary tables as the recordsource for a report. The problem occurs when I try and tidy up after the report is closed by trying to drop the temp table. Trying to do this using database.execute "DROP TABLE x" where x is the name of the temp table. Get a Run-time 3211 error that the table still has locks. I figured that any locks generated by the report would be dropped at least by the Deactivate event, but that doesn't seem to be the case. how to use a temp table in the report withot incurring an enduring table lock? The report is the sole user.
I have an event called "worksheet_selectionchanged" which occurs when a range/cell is selected in an excle file.When the event is triggered, all the tabpages in a tabcontrol should be removed.The code is given below:
Private Sub myWorksheet_SelectionChange(ByVal Target As Excel.Range) Handles myWorksheet.SelectionChange for each tabpagesToRemove as TabPage in tabcontrol1.tabpages tabcontrol1.tabpages.remove(tabpagesToRemove)
but when ever i select a cell in the excel file, the tabpages seems to be "not removed".
im using vb 2008 to read serial port data. my requirement is as follows, when the data is received from the serial port a timer is enabling in order to blink a button saying "tank empty". so i have written the code with the aid of this forums. but now my problem is the blinking button function is not working. first i thought its cuz timer is not enabling inside the serial_dataReceived event. so i invoked a dummy label. so the timer works. but its blinking function is not working.