How to terminate a winforms application?

Question

C++ / C#

Hello.
I have a c# winforms application. All the necessary code is executed by functions even before the form itself is loaded (in theory), it looks like this:

public Form1()
{
            this.Opacity = 0;
            this.ShowInTaskbar = false;
            this.FormBorderStyle = FormBorderStyle.FixedToolWindow;
            doit();
}

Actually, in the doit function, I need to close this application. Due to the fact that the form should not be loaded (I even removed Form1_Load from the code), the closing options do not work adequately (which I just did not try). All the time it crashes "Application *appname* has completed its work."
I need an option, how can I terminate the application from the same function, without opening the completion window.

Answer 1

Remove all code associated with the form. Make the initialization method static. Specify the type "console application" in the project settings, and the initialization method as the entry point.

Answer 2

If Application.Exit crashes, then look at the FormClosing event. Apparently something is being done in it, but in general, run it in debug mode and show the full error.
PS: As a crutch, you can use Environment.Exit(0);

public Form1()
        {
            InitializeComponent();
        }

        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            e.Cancel = true;
        }

        private void button1_Click(object sender, EventArgs e)
        {
           Application.Exit();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            Environment.Exit(0);
        }