Question

I am new to win forms (C#). The current form that I’m making has the option to create a new (blank) instance of itself, but if I ever close that first instance, all the others close as well. This is not what I want to happen. (Closing any form opened up from the first doesn’t close any others, though)

I was thinking it may be because I am creating a new copy from within one of the copies/objects, so it is tied to that first object so it closes when it does; however, if I open up another form from the one opened from the first one and then close that one that was opened from the first one, the one that I opened up from it doesn’t close.

I want it so that I can still close that first form without the others closing, and that when the last one closes, the program stops running.

Is there any way to do this?

Answer 1

You can run as many forms as you need but each in the separate thread

using System;
using System.Threading;
using System.Windows.Forms;

public partial class MyForm: Form
{
    public MyForm()
    {
        InitializeComponent();
    }

    private void Button1Click(object sender, EventArgs e)
    {
        var t = new Thread(() => Application.Run(new MyForm()));
        t.Start();
    }
}