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();
}