I want a help. I have a window form application. Whenever I click on the "close" of the form, the application should itself close.
Can anyone help me.
Regards,
Justin Samuel.
After your explanation:
In Form1, do something like:
Form2 f2 = new Form2();
f2.ShowDialog();
this.Close();
Application.Exit();
This is assuming Form2 can be shown Modal (Dialog), which I think is correct
A Winforms application will exit automatically when the main form is closed. The main form is the form that is instantiated and passed to Application.Run method in the Main method of the application.
If the application process does not exit when this form is closed, something is preventing it from closing, such as a thread (that is not a background thread) that is performing some work.
By your description, it sounds like you may have multiple forms in your application and one form is still running even if its's not visible. In this case, the close button, would close the form, but not exit the application.
You need to add an event handler for the Form_FormClosed event and then call Application.Exit() - Ideally, you could also handle the Form_FormClosing event if you want to give the user a dialog to ask if they really meant to close.
Maybe you are looking for the Application.Exit() method.
Related
Form2 is user confirmation window,i want to close the application by stop button on mainform,but currently form2 is active and there is no dependency between form2 and mainform.How to close application ?
You must be opening Form2 using ShowDialog() method. Instead of that use Show() method and on MainForm button's click event call Application.Exit() method
You can use...
// for WinForms application
if (System.Windows.Forms.Application.MessageLoop)
{
System.Windows.Forms.Application.Exit();
}
// for Console application
System.Environment.Exit(1);
So your problem is the parent window will not have focus/input until the modal window (the confirmation dialog) has finished.
So, to avoid this, just make the confirmation dialog using a custom window (instead of a common dialog / msgbox) and show it. This way if the user wants to click your main form they can (the confirmation will be on background, covered by the main window because of this).
it looks like you're showing the dialog as ShowDialog() or showing a built in MessageBox which is also a ShowDialog that needs to be closed in order for focus to return back to main window. So what you should do is create a custom Dialog and use dialog.Show() method. This will allow you to interact with your main window while the dialog is open and you can click on a button to close your application regardless of the dialog being open or not. Following code should do the closing work for you
Application.Current.ShutDown();
I have crated a windows form application.
VS2012 created a form1 form to me
then I crated a second form called Main
there is a button on form1 form to go to Main form
when I run the application using vs2012, and then I click the x button at the top right of form form1, the form close and I can start working on vs. but the problem is when I click the x button at the top right of the form Main, I can't start working on VS, but I need to click Stop Debugging red button in the vs in order to be able to type in vs.
so my question is when I give this application to my customers, and when the click the x button at the top right of the form, I need the application to close totally, I don't need them to go the task manager and close the application from it.
Your application starts with Form 1, when you close it you are closing the application. Main is just a form, when you close it you are closing the form. What you need to is, go to FormClosing event of Main form and add
Application.Exit();
got to the FormClosing event and put this code :
System.Envirenement.Exit(0);
Problem is because your Form1 form still running(hidden).
If you use Form1 only for open your Main form. Then delete Form1 and set Main as StartUp form in Properties of your proejct:
Application -> StartUp form
After this when you close Main form application will be closed properly
If you use Form1 then you need close Form1 too after you close Main form.
Use FormClosed eventhandler for this purpose
What do you do with form1 when you go to Main? If you just hide it in order to show the other, then close the other one, while just keeping form1 hidden, then form1 will naturally still be running, even if Main is closed.
Sounds like the logical thing to do would be to go back to form1 from Main when you close the latter - otherwise, you can close both using Application.Exit(0) on the appropriate event.
In either case, it would be easier to answer this if you had provided some actual code.
Update:
You could also use System.Environment.Exit(0), but that might require more privileges, which might or might not affect your situation. Again - some code would be helpful.
In regard to your comments, see this answer for more info about termination options.
Right click on Main form -> Properties
on the Event tab choose FormClosing event
and write this code
private void Main_FormClosing(object sender, FormClosingEventArgs e)
{
System.Environment.Exit(0);
}
Why is the messagebox shown before the form closes?
SomeForm myForm = new SomeForm();
myForm.Show();
MessageBox.Show("Some text");
Do I need to start a new thread, and wait for it to finish? I've never come across this problem before.
You need to use Form.ShowDialog() instead. Form.Show shows a modeless window, whereas Form.ShowDialog shows a modal form, i.e., that the user has to close before continuing.
Your example never actually closes myForm...only shows it. I would expect the code above to show myForm and then immediately show the MessageBox.
If you want myForm to close before showing the MessageBox, you'll need to call myForm.Close() at some point.
The reason for this is that myForm.Show(); starts the opening of a new window, however it is not a blocking call. It's not a dialog, it's a separate window, which runs on it's own.
If you want SomeForm to show as a Dialog (blocking window, waits for close to continue execution), then use ShowDialog. If you want to wait till the window is opened before you show the MessageBox, then add the MessageBox to the OnLoaded on the SomeForm claa.
If it's important that the user not be able to interact with the main form while this other form is being shown then you can use myForm.ShowDialog instead of Show. ShowDialog is a blocking function, so it won't return until the other form is closed. Show, on the other hand, just shows the other form and then immediately returns without waiting for the form to be closed.
If it's intentional that the other form is not being shown modally, and you don't (or can't) make that change, then you can use events to show a message box when the other form is closed.
SomeForm myForm = new SomeForm();
myForm.FormClosed += (form, args) =>
{
MessageBox.Show("Some text");
};
myForm.Show();
This will add an event handler, which fires when the other form is closed, and executes the desired code at the appropriate time.
I have two forms; one called 'win' and the other called 'loss'. There is a button on 'win' form which displays the 'loss' form. When this button is clicked both forms are visible. When I close the 'loss' form and then click the button on the 'win' form again I get the following exception:
An unhandled exception has occured: Unable to access a disposed object ..object :form
Please could someone point me in the right direction so I can resolve this?
It is because your 'loss' form is already closed and has been disposed, so it cannot be used anymore. You need to create a new instance of the form, like so (don't know how exactly your code looks):
this.loss = new LossForm();
this.loss.Show();
You can verify IsDisposed property of form, before referencing it.
E.g. button click handler on 'win' form:
if (loss.IsDisposed)
return;
// do stuff with loss form
Update: I think it's better not to share control between forms.
You can run 'loss' form as Dialog. And read all needed properties after dialog closed.
You can subscribe to 'loss' form events and process them in 'win' form.
It's not a very good model your going for but you could hook into the formClosing event, cancel it and then hide the form instead. That means the form wont be automatically disposed and you could call show again.
Put some time aside to research MVC architecture - it looks complicated at first, but it really does help.
I have a Windows application that has 2 Forms. From one form I am opening a 2nd form.
When opening the 2nd form I am hiding 1 form and in the second foem I am starting a thread.
Now I want to close the application.
But I was not able to do that.
On my 1st form I have tried:
Form1 frm = new Form1(this, tcpClient);
frm.ShowDialog();
this.Close();
Application.Exit();
But the application is not ending. It still running.
Any idea how to stop that?
EDIT (CODE Included):
On 1st form's button click event:
this.Hide();
Form1 frm = new Form1(this, tcpClient, serverMsg);
frm.Show();
On 1st form's button FormClosed event:
MessageBox.Show("Before");
Application.Exit();
On 2nd form's load event I am calling a method startThread(); on this method
ilThread = new Thread(incomingListener);
ilThread.IsBackground = true;
ilThread.Start();
When you do frm.ShowDialog() you're opening a modal window. The code will stop at that point until you specify a DialogResult on frm. I.e. frm.DialogResult = DialogResult.Ok;.
If you use frm.Show() that might work for you.
Edit- See #GenericTypeTea's answer first. If after doing that you are still having issues see mine:
From what you describe it sounds like you have left the thread running. Have you tried creating the thread as a background thread or making sure you end that thread in a clean way?
You probably didn't set the Thread you started as a background thread. Background threads are stopped automatically when application closes. Foreground threads will keep it alive.
To set thread as background thread use IsBackground property.
See Thread.IsBackground.
Otherwise you should take care yourself of stopping the started thread before exiting the application.