When Modal Form Goes Bad And Lets Its Owner Be Activated
Feb 24, 2012
I am currently converting a 90s VB6 application to VB.NET. While testing I came across something curious.A Modal form by definition will prevent users accessing any other form in the application.This I discovered is not always true as I have a Modal form displayed which allowed me to access its owner form's Menu.Searching MSDN I could find no mention of this feature. So I thought I would share it:Click Button 1 on Form2 and Form1 comes back to life!
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Aug 26, 2011
I am facing a rather odd problem right now. If you fellow this : Best place to put key or password used for encryption? i was looking at a way to encrypt data. Using RSA seemed to be a good choice. However we have a problem since my requirements are thoses fellowing...Client must have a file encrypted in order to determine if the software is activated.
That actually mean that the client must read the encrypted file.. but the problem is that we actually need the private key to be there which isnt a good idea since some poeple could start making their license file using that key. The activation server encrypt the data file which are sent back to the client and then the client save that file.
Client must have a file encrypted in order to determine if the software is activated.Client sent user data to the activation server in unencrypted/encrypted form. That doesnt matter. Sure it would be better encrypted at this point.The activation server check that data and then determine if the client can be activated.If the client can be activated then the server send the encrypted form of the license file.. but the problem appear now.. there is no way to deencrypt the file on the client if the private key isnt on the client which would be pretty insecure!
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Oct 27, 2009
I placed this checkbox named owner on my form. When i build the project i got the error as
Quote: 'owner' conflicts with property 'owner' in the base class 'Form' and should be declared 'Shadows'
[Code]...
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Feb 25, 2011
I have a parent form (form1), which is calling a second form (form2) as modal.[code]...
No form2 is modal. Closing this form2 from the form itself is clear.But how can I close the form via myform2.close from form1 via an event handler?
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Feb 4, 2011
I had issues in refreshing a form that is bound to different tables in a database. Various forms allow the user to change and add and update information on the form via the database. I had created a public sub in that form that the other forms could call, after saving the data, that was supposed to refresh the data on the main form. This was not working so I researched the problem. I came across this page which pertains to Form.Activated: [url]
I placed all of the table adapter fills into this event, instead of in Form_Load, and it seems to work now, when the form first loads, and when other forms update data. My question is does anyone have experience using this and what are the consequences, if any, in using this to reload/refresh the data showing on the form?
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Jun 30, 2010
I am trying to migrate a vb6.0 application to vb.net. I have a major issue while executing the code under form.activated and form.deactivate. There is a difference in behaviour between form.activate in vb6.0 and form.activated in vb.net. How can I simulate the behaviour of vb version in vb.net.
I have read that the form.activated fires even when the control goes to a different application and comes back.
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Jul 8, 2009
I am working on supplier maintenance file. From mainmenu, opening first form shows records on datagridview through databinding. Clicking add new record, i fired a second form as my data entry with detail view through databinding, minus navigational buttons. I left the delete and save button only. Once through data entry, i save it on server. My problem is, how can i reflect the added record on the first form while i am on my second form? I prefer the new record be added only to the first form. I don't want the idea of retrieving the records again from my server.
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Apr 3, 2011
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.
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Jul 9, 2010
We are converting a Visual Basic 6.0 application to vb.net 2008 and are having an issue, while executing the code under form activated event. There is a difference in behavior between form.activate in Visual Basic 6.0 and form.activated in vb.net. In Visual Basic 6.0, the Activate event was raised only when switching between forms in the application; in Visual Basic .NET, the Activated event also is raised in case of showing messagebox and when switching from other applications.(by msdn)
In vb6 application the purpose to use form activate event is, to execute some code when forms become active. In our application forms are loaded, hide and show in different flows. So whenever this form is shown from hide state or any of its child form return focus to it, we need to reflect different changes in the application to the specific form controls.
* For example user changes its application preferred language. * As the application is huge, so shifting logic to other place with respect to the current scenario might solve the problem for the current form but then I have to re think it for all other forms (which is very hectic and more or less not feasible). In the migration process it is required to make as little changes in the existing code execution hierarchy. So we need a similar behavior like form.activate in vb6.0 with some other event or restrict some functionality of Activated event in vb.net.
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Jun 5, 2012
I'm trying to make it where you can click make a dialogbox lose focus until you input the requested information. I'm trying to create an effect where if you try clicking on the parent form, it flashes and won't let you activate it. You can see this effect in Windows sometimes when an error box pops up and you have to click 'OK' to continue. How would I go about doing this in VB.NET?
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Nov 8, 2011
I'm trying to make it where you can click make a dialogbox lose focus until you input the requested information. I'm trying to create an effect where if you try clicking on the parent form, it flashes and won't let you activate it. You can see this effect in Windows sometimes when an error box pops up and you have to click 'OK' to continue. How would I go about doing this in VB.NET?
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Sep 8, 2009
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?
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May 18, 2010
Just had a small doubt.Say i use something like this
vb Dim ownr as New Form1Dim Dlg as New Form2ownr.Showdlg.showdialog(ownr)
how should i call an public function of form1 in the form2 if form1 is owner of form2, and also if form1 is not the owner of form2 should i use FormName.FunctionName in both the cases.
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Feb 10, 2010
Trying to build a project that lets users click an item from a list of products (tabbed form). Once an item is selected (check box) find a way to store that item.Then when the user has finished selecting items they can click a button showing what they have selected in a new form that will open.Whats the best way to store what items they select? An Array?
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Oct 28, 2010
I have a VB. Net App where I want the user to open a modeless form which contains reference information about items in a select box. If the user double clicks the item selected in the list box a modal form is opened to edit the item.I want the previously opened reference form to remain active/enabled, that is, I want the user to be able to click on it, move it, etc.I was able to get the form to at least show up on the task bar by setting it's "ShowInTaskBar" property to true, however, when it comes to the front the user can still not move it to the side to view all of the Edit Forms information.
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Aug 7, 2009
I'm having an interesting issue that I can't reproduce on a different project, but can consistently on this one. I have no clue what might be causing it, but am hoping that someone may have seen it before.
I have a main form, from which I run a series of checks. On this form, I have a listview control. Because of some issues with the refreshing of this listview control, I had to create my own messagebox. It's just a form that displays some text ( it also happens to look nicer than MsgBox; in my opinion, anyways ). It's been working great for months, until recently.
My problem is that on my main form's load event, I run this check, which returns an error within a try/catch block. I then call my custom messagebox with a message. It in turns calls it's ShowDialog() function.
In any other situation ( after the main form has been loaded ), I have no problems. The messagebox goes on the screen and behaves appropriately ( ie: waits for my input and acts as a modal dialog ( stops execution of my main form's thread ) ). However, on this onload event, my messagebox comes up and goes away almost immediately afterwards.
I've traced it all the way to the showdialog() call. For no explicable reason, it appears to skip right over this call, without me doing anything on the form.
Here's what the inner trace looks like ( when I put a breakpoint on the onclosing event for this messagebox form ):
CODE:
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Feb 3, 2010
I want to be able to check if there is currently a dialog or modal form shown for my form so that I can close it.
Is there a way to do this?
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Apr 18, 2012
I have a form in a vb.net windows form application called PolicyRefreshStatus.vb that has a ProgressBar control on it. From the main form called EditPolicy.vb I need to show PolicyRefreshStatus.vb over top of EditPolicy.vb - but the way things are wired I'm controlling the the ProgressBar and it's steps from logic inside EditPolicy.vbIf I display the PolicyRefreshStatus.vb bar using the .show() method things work fine.The problem is if the user clicks back on the main form then PolicyRefreshStatus.vb losses focus. If I show PolicyRefreshStatus.vb as a modal form using .ShowDialog() then execution halts in EditPolicy.vb after the .ShowDialog() statement.
so for example in the code:
mPolicyRefreshStatus = New PolicyRefreshStatus
mPolicyRefreshStatus.pbMax = mPolicy.ClaimsUpdateMax
[code]....
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Aug 11, 2011
I am trying to pass information to parent form from modal form in vb.net winforms application.
1.) I created a copy of a form and displayed it using following code.
dim f=new frmParent()
f.show()
2.) Depending on conditions a button on frmParent opens a modal child form and asks for some informations. I used following code for that:
dim f = new ChildForm()
f.showDialog()
Both code works fine. When user press saves in child form i need to close childForm and use the user types values in parent form. I know how to close the childform but not sure how to pass info from childform to parent form.
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Jan 26, 2010
I'm new in .Net and I have an application with windows form "LOGIN" When users enter the user and password and click "ok", then if user passes validation then I have the code Show(MDIMainMenu) (I'm trying to open an mdi form), but I receive the following error: "Form that is already visible cannot be displayed as a modal dialog box. Set the form's visible property to false before calling Show. Error Number 5"
[Code]...
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Jul 20, 2010
I have designed my app for multiple gridviews. When a user double clicks a row it opens up the data in a modal form and when they commit changes the row gets updated.While they have that modal window open they can not go back to the grid.But I have a alerts/messages window always running (like outlook tasks). As soon as I open the modal window I can not access that tasks window. (Default behaviour)How can I open the modal form and still let the user access/view the tasks window while they work on the modal window.(I tried creating it in a differant thread, but got a lot of cross thread errors so decided to abandon that approach.I thought that 2 modal form can run at the same time as long as they have differant parents. But aparently the main GUI thread pauses as soon as you open a modal window on it.
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Jan 29, 2012
I'm trying to pass a value from the main form, "form1" into "form2". I'm opening "form2" as a modal dialog from this line of code:
form2.ShowDialog()
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Jun 10, 2011
I have a form where I generate a report on some button click. I need to show another Form in Modal Form, And Place Progress bar on that and Increment the status, from calling form so that when progress bar is running user cannot close the form (where I placed button for showing report). To calculate progressbar's percentage is in the form where button to show report is.
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Mar 29, 2009
I've created an Excel COM add-in that has several forms. The application has the following forms:
FormA (Modeless): Excel.Application is parent
FormB (Modal): FormA is parent
FormC (Modal): FormB is parent
[code].....
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Nov 17, 2009
I have a situation where I need to display a Modal Window from a vb.net module and feed the contents to that modal form from the module.I am showing the form , feeding data to it from a class module and trapping the events in it using a timer control from the module.It works fine with Show() method but it doesn't with ShowDialog().If I used ShowDialog() then I was not able to continue with the code followed by it and not able to update any contents in the modal form.
I am using VS2003 version.Is there any workaround to this?
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Feb 11, 2011
I want to open a form as modal without using showdialog()Problem with showdialog() is we can not open the form as mdi child with it. i want to open few forms as modal but as mdi child forms. but i want to make sure user cannot go anywhere else without closing thst form.if we set parent form enabled = false then i can not set it as mdi child otherwise that form also becomes enabled=false.
if we write showdialog() then so many form icons will appear on taskbar. it we open as mdi child then only one icon appear i don't want to appear so many icons on taskbar so i want to open as mdi child but as modal
for eg. Mainform = mdi form
from mainform open formA = as mdi child of main form (but modal)
from formA open formB as child (modal)
from formB open formC as child (modal). if i use showdialog() then so many form icons on taskbar.
h2007
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Sep 20, 2010
If I have a form open already that is not modal, can I turn it modal by the click of a button on that form.
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Nov 17, 2009
I have a situation where I need to display a Modal Window from a vb.net module and feed the contents to that modal form from the module.I am showing the form , feeding data to it from a class module and trapping the events in it using a timer control from the module.It works fine with Show() method but it doesn't with ShowDialog().If I used ShowDialog() then I was not able to continue with the code followed by it and not able to update any contents in the modal form.
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Apr 1, 2010
As part of my design for a re-write of some vb6 code, i've got some business rules that check the data being entered. These rules run on the business layer, but if they find any data that is incorrect, they need to display a modal form showing the 'violation' (or could be a warning, a question or some information).
So what i'm after doing is to somehow display a modal form in my presentation layer triggered by my business layer.
The only solution i've come up with is to raise an event to get the modal form displayed, catch the event in the presentation layer and display the form (all items on the form would be bound and so would display the correct information). Problems with this is that i would then have to put the code to sleep in the business layer until i got a responce from the presentation layer.
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Aug 17, 2011
All of my forms are MDI children. I have one form that is collecting input parameters for a report. One of the parameters needs to come from another form. For the life of me, I can't get it to work.
[Code]...
I have to message box code just to verify the selection. glbPart is just a hand off parameter to tell the frmVendorList code to come back to this form rather than where it was origianlly programmed to go.I tried a do until glbVendor <> "", but that put me into a death loop and I never got to select a vendor from the vendor list form. Obviously, the easiest would be if I could make frmVendorList Modal, but I can't see how to do that once it's been created modally.
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