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• How to prevent MDI main form closing from MDI Child.

  - by Rekreativc

  Hello! I have a MDI main form. On it I host a form, and I want it to show a message box before it closes (asking the user whether to save changes). So far so good, however I have discovered that closing the MDI main form does not raise a MDI child FormClosing event. I figured I will just call MdiChild.Close() in the MDI main's FormClosing event (which does get raised). This seams to work, however it does causes a problem... In the messagebox that I show, I offer the user to save changes, not to save changes and cancel closing. Normally this works fine, however I can't seem to find a way to cancel MDI main's FormClosing event. Is there a elegant way of doing this? EDIT: I solved this by throwing an exception (when user decides to cancel the closing procedure) which is caught in MDI main's FormClosing event. In this way I know when I have to cancel the MDI main's FormClosing event and this seams to work fine ... However I just can't believe that this "hax" is the only way of doing this. Surely there is a better way?

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• C# - Removing event handlers - FormClosing event or Dispose() method

  - by Andy

  Suppose I have a form opened via the .ShowDialog() method. At some point I attach some event handlers to some controls on the form. e.g. // Attach radio button event handlers. this.rbLevel1.Click += new EventHandler(this.RadioButton_CheckedChanged); this.rbLevel2.Click += new EventHandler(this.RadioButton_CheckedChanged); this.rbLevel3.Click += new EventHandler(this.RadioButton_CheckedChanged); When the form closes, I need to remove these handlers, right? At present, I am doing this when the FormClosing event is fired. e.g. private void Foo_FormClosing(object sender, FormClosingEventArgs e) { // Detach radio button event handlers. this.rbLevel1.Click -= new EventHandler(this.RadioButton_CheckedChanged); this.rbLevel2.Click -= new EventHandler(this.RadioButton_CheckedChanged); this.rbLevel3.Click -= new EventHandler(this.RadioButton_CheckedChanged); } However, I have seen some examples where handlers are removed in the Dispose() method. Is there a 'best-practice' way of doing this? (Using C#, Winforms, .NET 2.0) Thanks.

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• ComboBox exception caused in winforms FormClosing event

  - by Spooky2010

  Using c# vs2008 winforms I have an application with a bunch of child winforms. Each time a form is closed I need to store the current selected value of a combobox that is on each form to a Global application variable so that I can track it and use it in new forms. The combobox is populated on form start via a method to set its datasource to an ArrayList of items What I have found is if the combobox is populated with items in the designer, and you try to get the combobox value in the form closing event, I always get a NullReferenceException. However if the comboBox has an datasource like I DO have in my application and I try to get the combobox value in the form closing event then I would say 95% of the time I DO NOT get the NullReferenceException, but I do get it 5% of the time. That ratio can even vary depending on what computer I run the application on. for example I have 1 computer where the exception always occurs. My question is therefore what is (the best) way to get the value of the combobox, last thing before the form closes without causing the exception. I would def prefer to do it last thing before the form closes rather than track it with every selected index change event. Any advice appreciated.

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• Better way to kill a Form after the FormClosing event is overridden to hide rather than close?

  - by Paul Sasik

  I have a simple Windows Form that hosts property controls at runtime. To keep the window and its contents alive rather than killing it by handling the FormClosing event, cancel the event and simply hide the form. That's fine but at close of the application I need to actually close the window. I implemented the below but it feels kludgey. Is there a simpler, more clever way to handle this situation? (The form's controller calls KillForm explicitly after it receives a closing event from the main window.) Friend Class HostForm Private _hideInsteadOfClosing As Boolean = True Private Sub HostForm_FormClosing(ByVal sender As Object, ByVal e As FormClosingEventArgs) _ Handles Me.FormClosing If _hideInsteadOfClosing Then Me.Hide() e.Cancel = True End If End Sub Public Sub KillForm() _hideInsteadOfClosing = False Me.Close() End Sub End Class

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• Read & Write app.config

  - by Rodney Vinyard

  Imports System.Configuration   Public Class Form1       Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load           Dim config As System.Configuration.Configuration = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None)         Me.txtFromFolder.Text = ConfigurationManager.AppSettings("fromFolder")         Me.txtToFolder.Text = ConfigurationManager.AppSettings("toFolder")         End Sub       Private Sub Form1_FormClosing(ByVal sender As System.Object, ByVal e As System.Windows.Forms.FormClosingEventArgs) Handles MyBase.FormClosing             'to write         Dim config As System.Configuration.Configuration = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None)           config.AppSettings.Settings.Remove("fromFolder")         config.AppSettings.Settings.Add("fromFolder", txtFromFolder.Text.Trim)           config.AppSettings.Settings.Remove("toFolder")         config.AppSettings.Settings.Add("toFolder", txtToFolder.Text.Trim)           config.Save(ConfigurationSaveMode.Modified)           ConfigurationManager.RefreshSection("appSettings")       End Sub

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• axAcroPDFLib at closing problem C#

  - by Hector

  Im using a axAcroPDFLib control taken from a Adobe Reader 9 installation to show and print user PDF documents within my C# window forms application. Everything works just fine untill the appication close... It throws the following error: The instruction at "0x0700609c" referenced memory at "0x00000014". The memory could not be read My FormClosing method is quite simple and i think is wrong, but i didn't know how to do it in the right way: private void Form2_FormClosing(object sender, FormClosingEventArgs e) { if (axAcroPDF1 != null) { axAcroPDF1.Dispose(); } } thanks in advance for any idea

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• WPF Hide on Close?

  - by Petoj

  How do i do this in wpf VB.NET Private Sub FrmSettings_FormClosing(ByVal sender As System.Object, ByVal e As System.Windows.Forms.FormClosingEventArgs) Handles MyBase.FormClosing e.Cancel = (e.CloseReason = Forms.CloseReason.UserClosing) Me.Hide() End Sub c# private void FrmSettings_FormClosing(object sender, System.Windows.Forms.FormClosingEventArgs e) { e.Cancel = (e.CloseReason == Forms.CloseReason.UserClosing); this.Hide(); } as wpf's Close event just gives me e.Cancel and no closereason :(

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• How to intercept an Exit event for a Windows Form in VB?

  - by Dooms101

  When a user clicks on the little red "x" a.k.a. the form close button on the form command bar, what even is activated besides FormClosed() I know FormClosing() is called, but I cannot really stop the form from closing after my code is run. I want to be able to show a messagebox that asks if the user wants to exit the form or not. Obviously if they click no, I want the form to stay open, how would I do this?

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• Stop the form from closing on close button click?

  - by Adam Witko

  Hi, If I have a close button on a form, and I want them to be able to click it but affectively act as a 'Hide' button, how can this be easily done? Is there no way to abort the formclosing event from executing fully? Cheers

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• GetWindowPlacement/SetWindowPlacement not working in WinForms for high DPI

  - by RandomEngy

  I've got a legacy WinForms app and I want to save the window position and size across sessions. I've been using GetWindowPlacement and SetWindowPlacement during the FormClosing and Load events. The problem I'm getting is that at higher DPI settings (Such as Medium, size at 125%) the sizes keep inflating. I'll call SetWindowPlacement on it with a certain size, but when GetWindowPlacement is called, those numbers come back 25% bigger, even though the window was the same size all along. The same sort of problem exists when saving the size of a resizable element within the form. Now this works fine if I create a new WinForms project: The size stays stable even when running at the higher DPI. I'm guessing there's some legacy setting in the bowels of the project or some arcane Form setting that's messing it up, but I can't find out where. I've called IsProcessDPIAware on both projects and both are true. Does anyone know what might be causing this?

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• E.cancel loop in Visual basic

  - by Ahmed

  I am making an server control application ( simple with some buttons to start/stop the server ) And when the user wants to close the application there will be prompted an confirm box. Private Sub Form1_FormClosing(sender As Object, e As FormClosingEventArgs) Handles Me.FormClosing Dim response As Integer response = MsgBox("Are you sure you want to stop the server", vbYesNo, "Stop Server ?") If response = vbYes Then Shell("cscript ""stop.vbs""", 1) Close() Else e.Cancel = True End If End Sub That is the code I have now. But when I start the application and close it with the X button or with "Close Window" I will be prompted with the question until I click on no, then it will close. It's a loop and it stops when you first click on yes then on no. Can someone help me with solving this ?

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• Windows.Forms RichTextBox Control - Avoid inserting large data.

  - by SchlaWiener

  I have a Windows Form with a RichTextBox on it. The content of the RichTextBox is written to a database field that ist limited to 64k data. For my purpose that is way more than enough text to store. I have set the MaxLength property to avoid insertng more data than allowed. rtcControl.MaxLength = 65536 Howevery, that only restricts the amount of characters that so is allowed to put in the text. But with the formatting overhead from the Rtf I can type more text than I should be allowed to. It even get's worse if I insert a large image, which dosn't increase the TextLength at all but the Rtf Length grows quite a lot. At the moment I check the Length of the richttextboxes' Rtf property in the FormClosing event and display a message to the user if it's to large. However that is just a workaround because I want to disallow putting more data than allowed into the control (like in a textbox if you exceed the MaxLength property nothing is inserted into the control and you hear the default beep(). Any ideas how to achive this? I already tried: using a custom control which extends the richtextbox and shadows th Rtf property to intercept the insertation. But it seems it isn't executed if I add text. Even the TextChanged Event does not fire if I type smth. in the control.

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• Implementation of delegates in C#

  - by Ram

  Hi, I am trying to learn on how to use delegates efficiently in C# and I was just wondering if anyone can guide me through... The following is a sample implementation using delegates... All I am doing is just passing a value through a delegate from one class to another... Please tell me if this is the right way to implement... And also your suggestions... Also, please note that I have de-registered the delegate in : void FrmSample_FormClosing(object sender, FormClosingEventArgs e) { sampleObj.AssignValue -= new Sample.AssignValueDelegate(AssignValue); } Is this de-registration necessary? The following is the code that I have written.. public partial class FrmSample : Form { Sample sampleObj; public FrmSample() { InitializeComponent(); this.Load += new EventHandler(FrmSample_Load); this.FormClosing += new FormClosingEventHandler(FrmSample_FormClosing); sampleObj = new Sample(); sampleObj.AssignValue = new Sample.AssignValueDelegate(AssignValue); } void FrmSample_FormClosing(object sender, FormClosingEventArgs e) { sampleObj.AssignValue -= new Sample.AssignValueDelegate(AssignValue); } void FrmSample_Load(object sender, EventArgs e) { sampleObj.LoadValue(); } void AssignValue(string value) { MessageBox.Show(value); } } class Sample { public delegate void AssignValueDelegate(string value); public AssignValueDelegate AssignValue; internal void LoadValue() { if (AssignValue != null) { AssignValue("This is a test message"); } } } Pls provide your feedback on whether this is right... Thanks, Ram

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• need to change TextBox.Text inside TextChanged, something forces form close

  - by Istrebitel

  I am making a TextBox behave like if it could store a null value. In order to do that, i have a variable NullMode that indicates wether the value is stored is Null, and in TextChanged i set that to false, and on specific user action i set it to true and Text to a value that indicates that there is null inside the textbox. Then, based on NullMode, textbox is drawn differently. Now, i have a semaphore-like approach in order to prevent event handle from firing when i dont need it. Here is how it looks: private void input_TextChanged(object sender, EventArgs e) { if (_preventTextBoxEvents) return; _preventTextBoxEvents = true; //if (NullMode) // Text = ""; NullMode = false; ValidateInput(); _preventTextBoxEvents = false; } Now, if i need to set a textbox text to something that should show while in nullmode, i just set _preventTextBoxEvents before i do to true and it works all right. BUT! I need to also remove the text when user tries to input something into the textbox! So i need to set Text to "". Problem is, if i uncomment that, form is closed after the event handler exits. I cannot prevent it (e.Cancel = true in FormClosing doesnt help!) and do not understand what can be causing it. There is no error message too (and i'm not doing try-catch). My logic, when i do Text="". OnTextChanged should fire, it should call my TextChanged and it will see _preventTextBoxEvents is true and exit, so there would be no stack overflow / infinite recursion. What is going on?

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• Error while closing SQL Connection

  - by Wickedman84

  I have a problem with closing the SQLconnection in my application. My application is in VB.net. I have a reference in my application to a class with code to open and close the database connection and to execute all sql scripts. The error occurs when i close my application. In the formClosing event of my main form I call a function that closes all the connections. But just before I close the connections I perform an SQLquery to delete a row from a table with the function below. Public Function DeleteFunction(ByVal mySQLQuery As String, ByVal cmd As SqlCommand) As Boolean Try cmd.Connection = myConnection cmd.CommandText = mySQLQuery cmd.ExecuteNonQuery() Return True Catch ex As Exception WriteErrorMessage("DeleteFunction", ex, Logpath, "SQL Error: " & mySQLQuery) Return False End Try End Function In my application I check the result of the boolean. If it returns True, then i call the function to close the database connection. The returned boolean is True and the requested row is deleted in my database. This means i can close my connection which I do with the function below. Public Sub DatabaseConnClose() myCommand.CommandText = "" myConnection.Close() myCommand = Nothing myConnection = Nothing End Sub After executing this code I receive an error in my logfile from the DeleteFunction. It says: "Connection property has not been initialized." It seems very strange to receive an error from a function that was completely executed, or am i wrong to think that? Can anyone tell me why I receive this error and how I can solve the problem?

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• .Net forms - intercepting the Close X event.

  - by Hamish Grubijan

  Hi, this must be a dumb question, but I cannot figure it out. I also cannot use the designer because coders before me managed to throw GUI and logic all in one, so now it is confused. I've got to do it the old school way. I have a Form which can be closed in 3 ways: Close button, File / Close menu, and the X icon. I want them all to do the same thing. Intercepting the button and the menu events is easy. In fact, both are hooked up to an onCloseConfig method. Btw, is there a better name for this method? private void onCloseConfig(object sender, System.EventArgs e) { if (! m_configControl.Modified) { Application.Exit(); // Or should it be this.Close(); } .... // Else present a dialog, ask if they want to save. } So, to intercept the X I tried: this.FormClosing +=new FormClosingEventHandler(this.onCloseConfig); I believe this is what causes an infinite loop. I do not want that :) FormClosed is another option, but it seems too late. I just want to intercept the fact that the X was clicked, not the fact that the form is closing. Please help. Thanks!

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• WinForms Form won't close on pressing X or Close() in C#

  - by MadBoy

  I'm having a bit weird problem with WinForm which seems to refuse to close for some weird reason. I've got very simple gui which sometimes doesn't react for me pressing X or when i use events on buttons it even reaches Close() and does nothing.. private void buttonZapisz_Click(object sender, EventArgs e) { string plik = textBoxDokumentDoZaladowania.Text; if (File.Exists(plik)) { string extension = Path.GetExtension(plik); string nazwaPliku = Path.GetFileName(plik); SqlMethods.databaseFilePut(plik, comboBoxTypDokumentu.Text, textBoxKomentarz.Text, sKlienciID, sPortfelID, extension, nazwaPliku); Close(); } } There are no events assigned to FormClosed or FormClosing. So how can I find out what's wrong. Sometimes X will work after the GUI is loaded but after i press Button to save some stuff to database it reaches Close() in that button event and it still is visible and does nothing. Can't use X, nor ALT+F4. I can go around GUI and choose other values for ComboBox without problem. I call GUI like this: private void contextMenuDokumentyDodaj_Click(object sender, EventArgs e) { var lv = (ListView) contextMenuDokumenty.SourceControl; string varPortfelID = Locale.ustalDaneListViewKolumny(listViewNumeryUmow, 0); string varKlienciID = Locale.ustalDaneListViewKolumny(listViewKlienci, 0); if (lv == listViewDokumentyPerKlient) { if (varKlienciID != "") { var dokumenty = new DocumentsGui(varKlienciID); dokumenty.Show(); dokumenty.FormClosed += varDocumentsGuiKlienci_FormClosed; } } else if (lv == listViewDokumentyPerPortfel) { if (varPortfelID != "" && varKlienciID != "") { var dokumenty = new DocumentsGui(varKlienciID, varPortfelID); dokumenty.Show(); dokumenty.FormClosed += varDocumentsGuiPortfele_FormClosed; } } } While I can't close GUI i can work on the main gui without problem too. I can open up same GUI and after opening new GUI i can quickly close it. GUI is very simple with few ComboBoxes,TextBoxes and one EditButton from Devexpress. Edit: varDocumentsGuiPortfele_FormClosed code allows me to refresh GUI (reload ListView's depending on where the user is on now). private void varDocumentsGuiPortfele_FormClosed(object sender, FormClosedEventArgs e) { TabControl varTabControl = tabControlKlientPortfele; if (varTabControl.TabPages.IndexOf(tabPageDokumentyPerKlient) == varTabControl.SelectedIndex) { loadTabControlKlientPortfeleBezZmianyUmowy(); } }

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