Checkbox MDI Application - Use Checkboxes To Show And Close Child Forms?
Aug 30, 2009
I'm trying to use checkboxes to show and close child forms.I'm using MDI. I want to try and make the child form show inside of the parent form like it should.This is the code I was using:
[code]...
And that works, but if I close the window instead of using the check box and then try to use the checkbox to open the new window again i get an error:Object reference not set to an instance of an object.Also I have more than one checkbox (each one serves a child form) and I would like to be able to open and close any of the child forms at any time.
I'm in the process of converting a VB6.0 application to VB.Net (2008 Express). I have a MDI parent form, I'll call mdiBackground, and 4 MDI child forms, frmStatus, frmShow, frmQwerty, and frmSentence.The layout is as follows:mdibackground - has the menus at top and is a container for the child forms.frmSentence - appears at the top frmShow & frmQwerty - appear at the left and when one is closed the other one is in the same position.frmStatus - appears at the right, it has buttons which control when frmShow and frmQwerty are to appear I have a couple of regular forms that act as dialog forms. The Me.Close() works fine on these.
I have been looking around at how I can close my parent form and my child form. This article: [URL] has some information but it either doesn't work for me or I am putting the wrong information it. What I want to happen is when a button is pressed I want to close both parent and child forms and then go to another form (frmResults). Then there will be a button on frmResults that will take me to the beginning form (frmPTCalculator). With this code below when I click the button on frmCalculator it goes to the MDI form and both parent and child forms are there.
my Parent form is called: frmGender my Child form is call: frmMale & frmFemale
Below is what I have tried from the example in my Child form frmMale:
Private Sub btnResults_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnResults.Click Dim frm2 As frmMale = New frmMale() AddHandler frm2.FormClosed, AddressOf frm2_FormClosed
When my application first loads the parent opens and I select my child form from toolstrip:
'In parent open the form when option is clicked Public Sub Showfrmitemreview(ByVal sender As Object, ByVal e As EventArgs) Handles itemreivewStripMenuItemA.Click, itemreviewStripMenuItemB.Click
[Code]....
Nothing happens I don't even get an error message. I've played around with the code numerous times and the only thing that worked was to have it open outside of the parent which I do not want to happen.
The problem: A dialog's FormClosing() event is raised if it's a child, ie it's Owner property is set to the parent form, but NOT if it's a child-of-a-child. So closing the main form does not call the closing event on any grandchildren dialogs.
The Details: A dialog prompts to "Save Changes?", with YesNoCancel buttons, in the FormClosing() event. Clicking Cancel keeps the dialog open, ie cancel closing.
Private Sub Dialog_FormClosing(...) Handles Me.FormClosing If MessageBox.Show("Save Changes?", YesNoCancel) = No Then e.Cancel = True
[Code].....
Then the FormClosing() event on the child does not raise, if the top-most parent is closed.
Is this a know design limitation in the framework? Is there anything I should consider before I start hacking a nasty solution for this?
Dim FormTwo As New Form2 FormTwo.ShowDialog() Close()[code].....
if I use Application.Exit, it will close all 3 forms.. But all I want to use is Close so that every time I show the Form2, it will close the Form1 first.. the same when I show the Form3, it will close the Form2 first.
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Dim heckBox As New CheckBox() Form1.Controls.Add(checkBox) checkBox.Location = New Point(10, 10)
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Dim chk As CheckBox Dim sb As New System.Text.StringBuilder Dim names As String For Each chk In gbInterior.Controls
[code]....
I have also tried the code below but cannot figure out how to check the status and print the checkbox caption.
Dim ctl As Control For Each ctl In gbInterior.Controls If TypeOf ctl Is CheckBox Then
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Private Sub cmdNext_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdNext.Click Dim f As New frmOrder3
findwindowEX Send Message in Child of a Child of an ApplicationFirst:- my english is very ad (german)- i am a newby of Visual BasicMy Form with SQL-Integration is sending Data per Button to Notepad sucessfull. Unfortunately, the purpose application has interlocking children.But the application don become the data. to found a solution / or a Idear. i think i put in screenshots an my
Public Class Form1 'Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
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Private Sub CloseToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles CloseToolStripMenuItem.Click Dim frmActive As Form = Me.ActivateMdiChild
