MDI Form App

[visualise01]

I have created a windows app form project.

I have 3 forms, the first one I have set to be MDI Parent, the other two are Child.

When I click a button to open the two child forms, how can I stop them from opening more than once.

As it is just now, the form opens however many time I click the button, but I only want them to open once.

[Curtis Rutland]

What I do is make the child forms members of the parent form. Private global variables if you will:

public class Form1 : Form
{
private Form2 f2;

public Form1()
{
InitializeComponent();
f2 = new Form2()
}
}

And when I want to show it, I check to see if f2 has been disposed. If it has, I make a new instance and show it, otherwise, I just focus on it.

Note: I just typed this code in by hand. I didn't copy+paste from an existing project. This is just an example.