Question

I have a form that is used like a dialog, to be sure that the dialog get the correct parent the following method is used :

this.ShowDialog(myForm);

The problem is that this(my dialog form) and myForm is created on diffrent threads and when calling ShowDialog a crossthread exception will be thrown.

this.InvokeRequired = false
myForm.InvokeRequired = true

How do I handle this? Do I have to make sure that both are created on the same UI thread?

Answer 1

You have to ensure that all forms are created on the UI thread.

So rather than create the form on your background thread, pass a message to the UI thread to tell it to create and display the form.