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Exit application by clicking button on mainform when already pop up form is running

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();

make a form non interactive when another open c# winforms

i open a form on button click and the first one remain opened also.
I want the form below to be non interactive.
Means if user click on the form below he should be unable to.
I used topmost property but it doesn't solve my problem.

Use the Form.ShowDialog method to open a modal form:
using (MyForm frm = new MyForm())
frm.ShowDialog();

Word loses focus (minimized) after closing non-modal form

I have a problem with the Word Add-in I'm developing.
The problem:
If I open non-modal form called Form1, and inside this form I press a button that opens another modal form called Form2. Now I close both forms, but Word windows is losing focus and minimized.
Note that this is not happening when I just open Form1 and close it.
When I open a non-modal form (let's call it Form1) by using Form1.Show(IWin32Window);
where the IWin32Window object is created by this method:
public static MyWin32Window getWordWindow()
{
IntPtr wordWindow = NativeMethods.FindWindowW("OpusApp", Globals.ThisAddIn.Application.ActiveWindow.Caption + " - Microsoft Word");
MyWin32Window myWin = new MyWin32Window(wordWindow);
return myWin;
}
The problem occurs only when I open another form from Form1, let's say Form2 is opened, but Form2 is modal form and opened with:
Form2.ShowDialog();
It works fine, but when I close Form2 and then Form1, the Word window is minimized. How can I prevent this behavior?
I also tried setting Form1 as the owner of Form2, like this:
Form2.ShowDialog(this);
but same result.

I found that I was able to resolve this problem by using
Form.Show();
instead of ShowDialog().

Place form on top and disable others behind it

I have a Main Form and a Other Form.
The Main Form is always open, and at some time it will launch Other Form.
I tried:
form.TopMost = true;
But this only places the form on top. The Form behind (Main Form) still can be accessible.
How can I get the same behavior like when I do OpenFileDialog, and disable the main form behind it?
(Thanks in advance)

You need to make your form modal. To do this, use ShowDialog instead of Show to display it (the same way you do with a dialog).
Also, note that forms shown with ShowDialog are not actually closed and disposed when you click their Close button, so you should dispose them manually. The usual way to handle their lifetime is to use a using construct:
using (var form = new SomeForm())
{
form.ShowDialog();
// do stuff after the dialog is closed
}

form.showdialog(); where form is the the top form to be launched.so while lauching the top form just add form.showdialog()

.NET Compact Framework - modal Form without ShowDialog

Is there a way to show a modal form without ShowDialog metod calling? By showing a modal form I mean that the Form overlays the current Form and prevent user input to the bacground Form. The Form that is to be shown is a MessageBox style form that is not fullscreen.
Thanks
Dominik

I would assume that you could set the "dialog" form to stay on top (TopMost property) and then disable the main form in order to prevent input.
This is only a partial solution as the main form will still be able to be focused, closed etc. You will need to handle all these cases yourself in order to prevent them.
Is there any particular reason you don't want to use ShowDialog?

You could try to do this:
MyForm frm = new MyForm(); // this would be your modeless dialog
frm->show(this); // "this" being the instance that invokes it.