Question

I’m trying to open a new window form on a button click

In main program’s constructor I’ve got:

form_targeting = new Targeting();

In button1_Click(…) there is:

form_targeting.Show();

and ofc in main program’s fields there’s

public static Targeting form_targeting;

When opening first time, It works correctly. After closing 2nd window and pressing the button in a 1st window again, I get error:

Cannot access a disposed object. Object name: ‘Targeting’.

I’ve added that into Targeting class but it still doesn’t work:

        private void Targeting_FormClosing(Object sender, FormClosingEventArgs e)
            {
                this.Hide();
                e.Cancel = true;
            }

It works now, I had to write completely the same but using designer :p
thanks guys 🙂

Answer 1

Closing the form calls Dispose on it. You need to write a handler for the FormClosing event. In that event handler call Hide on your form instance and set e.Cancel = true so that the form is not closed.