C# close all forms

Question

I have a problem with my program.

I have 3 Forms: First one opens a second form. Second one opens a third form or returns to the first form. The third form can open the first or second forms.

This is how I open a second Form:

private void Open_second_form()
    {
        Form2 myForm = new Form2(Type_person);
        this.Hide();
        myForm.ShowDialog();
        this.Close();
    }

The rest of the forms I open exactly the same.

Here is a code for how I close forms. Every Form has this method:

private void Form1_FormClosing(object sender, FormClosingEventArgs e)
    {
        if (MessageBox.Show("Exit or no?",
                           "My First Application",
                            MessageBoxButtons.YesNo,
                            MessageBoxIcon.Information) == DialogResult.No)
        {
            this.Close();
            Environment.Exit(1);
        }
    }

When I open the third form I get 3 MessagesBoxes. If I open first form I got only 1 MessageBox.

I want to close all forms while getting only one MessageBox.

I tried a lot of solutions but none worked. I tried Application.exit();

Please help me :)

Answer 1

Your confirmation message is funny and result is unobvious =D

There are 2 solutions possible to your issue.

1) If user chooses to close application - don't display confirmation anymore

private static bool _exiting;

private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
    if (!_exiting && MessageBox.Show("Are you sure want to exit?",
                       "My First Application",
                        MessageBoxButtons.OkCancel,
                        MessageBoxIcon.Information) == DialogResult.Ok)
    {
        _exiting = true;
        // this.Close(); // you don't need that, it's already closing
        Environment.Exit(1);
    }
}

2) use CloseReason to confirm only user actions

private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
    if (e.CloseReason == CloseReason.UserClosing)
    {
        if(MessageBox.Show("Are you sure want to exit?",
                       "My First Application",
                        MessageBoxButtons.OkCancel,
                        MessageBoxIcon.Information) == DialogResult.Ok)
            Environment.Exit(1);
        else
            e.Cancel = true; // to don't close form is user change his mind
    }

}

Answer 2

Call the Environment.Exit(0); method

 private void btnExit_Click(object sender, EventArgs e)
{
    Environment.Exit(0);
}

Answer 3

I'm using this snippet always on my menu form. I hope this helps.

for (int i = Application.OpenForms.Count - 1; i >= 0; i--)
{
    if (Application.OpenForms[i].Name != "Menu")
    Application.OpenForms[i].Close();
}

Answer 4

For the form 1, considering the button is called btnForm1To2

private void btnForm1To2_Click(object sender, EventArgs e)
{
    using (Form2 myForm = new Form2(Type_person))
    {
        this.Hide();
        myForm.ShowDialog();
        this.Show();
    }
}

Inside FORM 2, considering the button to page 1 is btnForm2To1, and the button to page 3 is btnForm2To3

private void btnForm2To1_Click(object sender, EventArgs e)
{
    // Just close the form 2, as it was called from form 1, this form will be displayed
    this.DialogResult = DialogResult.OK;
}

private void btnForm2To3_Click(object sender, EventArgs e)
{
    using (Form3 myForm = new Form3(...))
    {
        this.Hide();
        DialogResult form3result = myForm.ShowDialog();

        // Now handle the results from form 3 to navigate to form 2 or 1
        // In my example, form 3 replies Abort to go back to 1. On cancel (or other dialog results) we will stay on form 2
        if (DialogResult.Abort.Equals(form3result))
        {
            this.DialogResult = DialogResult.OK;
        }
        else
        {
            this.Show();
        }
    }
}

Inside FORM 3, considering the button to page 1 is btnForm3To1, and the button to page 2 is btnForm3To2

private void btnForm3To1_Click(object sender, EventArgs e)
{
    this.DialogResult = DialogResult.Abort;
}

private void btnForm3To2_Click(object sender, EventArgs e)
{
    this.DialogResult = DialogResult.OK;
}

And if you want that the user confirms his click with a MessageBox, just place them before the this.DialogResult in each button click method

Answer 5

Note that this way is faster than Environment.Exit(0); .

WPF

Set your Window Closing Event in ( ###Window.xaml )

Closing="Window_Closing"

and then in ( ###WWindow.xaml.cs )

private void Window_Closing(object sender, System.ComponentModel.CancelEventArgs e)
{
    foreach(Window w in Application.Current.Windows)
        if(w != this)
            w.Close();
}

Windows Form

• Go to Form#.cs [Design] >> Form# Properties

• Then click on Events

• And double-click on FormClosing

In ( Form#.cs )

If you're closing from your Startup form, it's better to use this code.

 private void Form1_FormClosing(object sender, FormClosingEventArgs e)
 {
     for(int i = 1; i < Application.OpenForms.Count; ++i)
         Application.OpenForms[i].Close();
 }

else ( Works for any form )

 private void Form7_FormClosing(object sender, FormClosingEventArgs e)
 {
     for(int i = 0; i < Application.OpenForms.Count; ++i)
         if(Application.OpenForms[i] != this)
                Application.OpenForms[i].Close();
 }

Answer 6

If you'd like to close all forms (particularly dialog windows) except for the main form, I've found this function to be useful.

        public static void closeAll()
    {
        FormCollection fc = Application.OpenForms;
        if (fc.Count > 1)
        {
            for (int i = (fc.Count); i > 1; i--)
            {
                Form selectedForm = Application.OpenForms[i - 1];
                selectedForm.Close();
            }
        }
    }

Answer 7

Application.Current.Shutdown();

That's what I use whenever I need to close an entire application. It closes all forms, so great for closing everything. I don't know if this is exactly what you want.