Winforms - Canceling A TabControl Tab Selection
Sep 17, 2010
Really wracking my brain here and I'm sure it's something simple I'm missing. Basically I have a form with two tabs. I'm checking the controls on each tab to see if they're dirty and want to prevent a user from clicking a tab if there are changes on the current tab.
I had thought if I check the dirty variable and just set the tab index to the one that hasn't been selected I'd be fine but every time I programatically set a tab's property, it fires off a bunch of the tab's events that just produce an undesireable result such as the right control set is showing but the wrong tab is selected. Here is the code for as close as I've gotten to getting it to work.
[Code]...
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Aug 22, 2011
VB.NET Windows Forms Project, VS2010.I have a tabcontrol with several tabpages and on each tabpage there is a textbox. I want the focus (and insertion point) to go to the end of the text in the textbox when the tab is selected. If I make a junky project with the following code in each tab, it works fine:
Private Sub TabPage1_Enter(ByVal sender As Object, ByVal e As System.EventArgs) Handles TabPage1.Enter
With TextBox1
.SelectionStart = .Text.Length
.Select()
End With
End Sub
However, the same code is not working in my actual project. I am having trouble debugging, because if I step through, the breakpoints and IDE mean the focus events don't fire in the same order.
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Dec 15, 2010
Does anyone know an easy way to set a keyboard shortcut for a tab in a tab control in Visual Studio 2010? Is there some property I can set?
I looked online, but all the articles I saw were very confusing.
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Sep 23, 2010
how to set header color for tabpages in WINFORMS. and also the back color.
In my code. For j = 0 To dataset4Category(i).Tables.Count - 1
Dim Finder As Integer = Decimal.Floor(((dataset4Category(i).Tables(0).Rows.Count) / 30))
key = dataset4Category(i).DataSetName
name = Space(1) & StrConv(dataset4Category(i).Tables(0).TableName, VbStrConv.ProperCase) & Space(4)
myTabControl.TabPages.Add(key, name)
myTabControl.TabPages(j).Tag = 0
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Dec 18, 2009
I'm having a weird behaviour with a left-aligned TabControl in VB.NET. Screenshot:
What I wanted was to have the tabs literally the same way they would be if rotated 90 degrees to the left. Does it have something to do with the fact I'm not (god forbid) using the standard XP theme? Any solution to just make it work? (Even if it's hard, but I don't want a control that has a contrasting style, I want the program looking consistent)
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Jan 23, 2012
I have a Win Forms app written in vb.neIn it, I have a combo box with an OwnerDraw Item routineUsing this routine, I am able to implement an application-wide default value for a selection color like shown below:This works great except for one tidbit:ction color again in teh textbox portion of the control
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Apr 16, 2010
I have a little problem with a little VB.NET application that I am building. This is a winforms applications not WPF.I have a checkedlistbox with a few items and I want to allow user to select more than one using arrows keys or mouse clicks combined with shift and ctrl keys so I set selectionMode property to multiExtended. In design time it is not possible I get an error: It says value property is not valid.and if I set it in runtime by doing:
clbEmployees.SelectionMode = SelectionMode.MultiSimple
I get an error too: It says CheckedListBox is not compatible with multiple selection.
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Aug 17, 2009
I'm using a While loop that loops a certain number of cycles (1-576) based on a value entered by a user. It's activated by the user clicking a "Start" button, But I would like it to be able to be canceled using, preferably, the "Escape" key. However, when the loop is going I can't get the program to recognize any keypresses.
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Dec 10, 2009
I have a program in VB2008 and I need to execute a thread from differents Subs.Each time I start the thread I want to cancel the previous.Here an example:
Private Sub TextBox_Changed(ByVal sender As System.Object, ByVal e As System.EventArgs) Dim ThreadResults As New Thread(AddressOf ShowResults) ThreadResults.Start() End Sub Private Sub ckBoxAllRecords_CheckedChanged(ByVal sender As Object, ByVal e As System.EventArgs) Dim ThreadResults As New Thread(AddressOf ShowResults) ThreadResults.Start() End Sub
I write in a textbox, TextBox_Changed fires, thread spend 4 minutes filling a dataset I check a checkbox, ckBoxAllRecords_CheckedChanged fires, thread spend 10 seconds filling a dataset.I dont want anymore the dataset of TextBox_Changed so I want to cancel its filling.
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May 13, 2010
I've set up a background worker to search a directory for emails and if my specifi criteria (i.e. date ranges, contains a word) are fulfilled, then a list view is populated.I have this working absolutely fine - when I click search, the list view is populated as I watch - but when I press my 'Stop' button, which runs bg.CancelASync() it does not stop the process at all - results still populate in the list view as it was before.
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Mar 4, 2010
I have a DataGridView in which I register customer orders.
The DGV has a column "PRICE", Price must be > than 100, and I control that in this way:
Private Sub DataGridView1_CellValidating(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DataGridViewCellValidatingEventArgs) Handles DataGridView1.CellValidating
Dim newInteger As Integer
[Code].....
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Nov 21, 2010
I'd like to start by saying that simply though searching, DreamInCode has taught me alot about VB.NET. In fact, I would imagine without DIC as a resource, I probably wouldn't have been able to move forward and learn most of what I know now, just because I got stuck on some things here and there.Anyway, I searched around for information regarding how to "capture" a minimize event in VB.NET. I am working on the GUI for an application that I would like to have minimize to the system tray. Currently, instead of accomplishing this with the minimize function, I do it on the FormClosing event like this:
Private Sub MainFrm_FormClosing(ByVal sender As System.Object, ByVal e As System.Windows.Forms.FormClosingEventArgs) Handles MyBase.FormClosing
'Cancel the attempt.
[code]....
That code works, and upon making the form visible again with Me.Visible = True the form is restored to its original position. However, prior to the form being hidden, the window manager draws a minimize and restore effect before eventually hiding it. Any change to the WindowState _after_ hiding the form does not appear to have any effect, so when the form is unhidden it is still minimized.is there a way to capture Minimize events, and when captured, is it possible to cancel them in a manner similar to what I did with the FormClosing event?
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Aug 14, 2009
I have a task that needs to be executed many times in a thread, so as to keep my GUI responsive. Right now I'm using the ThreadPool to accomplish the tasks, and it works perfectly. I get all the data I expect back from the threads, life's good. When those tasks are finished, I then fire off another set of threads to accomplish another set of tasks, in the same fashion. The work method of these threads uses a call to RegistryKey.OpenRemoteBaseKey, which does exactly that, opens a remote registry key. The problem is: if the user running the application does not have permission to open the remote registry the call will throw an IOException, but I expect this behaviour because the user does not have permission to do it. However, the call itself can take FOREVER.
I wrote the application initially to use delegate methods and used the WaitHandle.WaitOne() method on AutoResetEvents in a state object I passed to each delegate. I tried the WaitOne method using a timeout, which worked fine until I realized that even though the WaitOne timed out, the thread was still running. This is a problem because (from what I understand) processes are only given a certain number of ThreadPool threads and, once used, they must be finished in order to be released back to the threadpool. In my work method, I also have a variable that can be signalled when the thread should be stopped, but that (obviously) only works on code that I've written.how can I cancel a thread that's stuck on a .NET method? Is there some sort of garbage collection method I can call if I give it a handle?
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Feb 22, 2009
I'm trying to create an app with a backgroundworker to enable canceling a loop, but it won't work as I hoped it would.When I debug right after the line ThreadWorker.RunWorkerAsync() the programm goes directly to Private Sub ThreadWorker_RunWorkerCompleted and skips the Private Sub ThreadWorker_DoWork part, where of course the actual code is in (I've left that code out, it's about a 100 lines and without BGW it works).Does anyone have an idea what could be wrong with it?
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Jul 18, 2010
Right basically if a checkbox in my application is checked "Close to system tray" then my form will cancel close and send to tray instead
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Oct 12, 2009
Protected Overrides Function ProcessDialogKey(ByVal keyData As Keys) As Boolean If keyData = Keys.Enter Thenme.currentcell.value = "Hello" ' Here i want to give text "hello" to the current cell is this possible
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Feb 27, 2009
I am trying have a data grid selection populate a form. I am new to this.Basically I have a connection persistance object and I would like to call that and call a stored procedure with the value of the selection. The datagrid is bound to an object.
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Dec 25, 2010
I have a listbox (20 Items) with multiselection and label that disply the selection and one button. So I wrote (it works fine)
[code]...
Now when I click on button the label show lets say Item2,Item5,Item10,How do I take off the last ","
somthing like that Item2,Item5,Item10
I used to do: Dim s As String = Trim(Label1.Text)Label1.Text = s.Substring(0, s.Length - 1) but it give me an error converting intiger to string
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Jun 16, 2009
osheet.Range("A1").Select
'The line below is the one I would like to know how should I write it in VB.NET:
osheet.Range(Selection, Selection.end(xlDown)).Select
[code]......
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Aug 26, 2011
I am using this code to select a folder.how to do the same kind of thing selecting a file instead of an folder.
Private Sub PathButtonB_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles PathButtonB.Click
Using FolderBrowserDialog As New FolderBrowserDialog
With FolderBrowserDialog
.Description = "Kies die Folder waar hierdie ResepteBoek die Kunswerke vir sy Resepte moet gaan soek."
.ShowNewFolderButton = False
[code]....
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Mar 18, 2010
Found this:
Sub SurroundWithAppendTag()
DTE.ActiveDocument.Selection.Text = ".Append(""" + DTE.ActiveDocument.Selection.Text + """)"
End Sub
But I can't seem to figure out how to loop through each line of text in the selection.
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May 28, 2010
Is it possible to set a project default for VB.NET winforms projects so that the default Modifier for controls added to winforms is Private (not Friend)?I know there's a "modifiers" property in the properties window so I can set it for each individual control however I would like to change the project so from now on myself and other developers have to specifically decide to change from friend to private. (Which I would strongly discourage them from doing).I believe there is no way of doing this, but on another forum a while ago someone mentioned it would be possible with an add-in (but didn't name the add-in or where to get it).
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Sep 17, 2011
I'm working on a web browser with tabbed browsing, however..When a new tab is created, it creates a web browser in it - but I want a function called when the browser is finished loading. I can't create a private sub inside a function, So I am not sure what I should do.
My Code:
Function addtab()
Dim myTabPage As New TabPage()
Dim theweb As New WebBrowser
[code]....
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Aug 30, 2009
I get an error when I try to add a tabpage to my tabcontrol.
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May 17, 2009
i would like to add icons/images to my tab control tabs, kind of like a webrowser has the icons in the tabs. i know i need a image list, which i have added. i also added two images, 1.png and 2.png.. the rest, i'm lost.. couldn't find anything decent on the internet..so much work to do and so many choices to choose from...
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Apr 16, 2009
I have a tab control with several pages. Within a page I have a panel. When I drag and drop a database to the panel the datagrid view is placed on the panel, but the bindingnavigator is placed outside the tabcontrol. Running the application shows only the bindingnavigator, which seems to have blocked the tabcontrol. If I cut and paste the bindingnavigator to the panel, and running the application shows the page with the bindingnavigator at the top and the datagrid below. However, the bindingnavigator no longer allows me to add and save entries to the database. I made sure all the properties were the same before and after i cut and pasted the binding navigator.As a test, I removed the tabcontrol, dragged and dropped the database to the empty form, and everything worked.
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Nov 4, 2009
I was working with TabControl on a form.I wish to restrict the selection of the tabs on the form...For example, The user will start with the 0 index Tab selected by default.As he selects an option from that tab pane n confirms his selection, The next tab gets selected. I could develop a code for this like this tabcontrol1.selectedindex = 1 'Or 2 or 3 according to the need But Now I find that at runtime I can switch back to some other previous tabs or some forward tabs.... Which I do not want. I simply want the tabs to be activate in a flow...
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Jul 24, 2009
i am using vb2008 express edition and i was just wondering if it was possible to put the tabs in the titlebar of your form like in google chrome?
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Feb 15, 2012
Are there anyone know how to select a tab in tabcontrol using API?
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Feb 10, 2009
I've Got an Tabbed advanced Webbrowser wich i want to release soon..But, I am just running against one problem.I want to create a Button wich popups a little form or messagebox with textfill oppertunity where an user can put the adress of the page he want to start with the first Tab.i know how to work with settings etc.just need to know how to make a button giving a textbox and if you click OK tthe filled in website is your new mainpage.
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