Question

I would like to reopen a closed windows form in c#.

I actually actively close the form to allow autoIT scripts to run on a different windows application. However I would like to reopen the same form after the scripts are done.

So…

this.Close();
.
.
.
Application.Run(new FormTestPage());

However this gives me an error that says to use Form.ShowDialogue instead.
I’m unsure how that works.
Thanks in advance!!

Answer 1

If you close the main form and you started the application with

var frm = new MainForm();
Application.Run(frm);

Then closing the main form will also close the application. Start the application like this instead

var frm = new MainForm();
frm.Show();
Application.Run();

Now when the application has to close, you must call Exit (because it is not closed automatically anymore):

Application.Exit();

You can do this in the main form in the FormClosed event when you are not just closing the form temporarily.

Now you can reopen the form normaly with:

var frm = new MainForm();
frm.Show();