Items Count of listbox on another form

Question

While I'm debugging, the value of ex always comes back as 0.

I can't modify or read ListBox values on different form. I have two forms here. How can I resolve this?

Form1 eski = new Form1();
Form2 yeni = new Form2();

ListBox array = new ListBox();
int ex = eski.listBox5.Items.Count;
for (int ix = 0; ix <= ex; ix++)
{
    array.Items.Add(eski.listBox5.Items[ix]);
}

Answer 1

The problem on your code is this one:

Form1 eski = new Form1();

You are initializing a new form and this code will not call the opened Form1 which is already running on your application.

You need to replace that and do this instead:

var eski = Application.OpenForms.OfType<Form1>().SingleOrDefault();

With that, you can now access the controls that you want.