System.Windows.Forms.FormCollection.GetEnumerator C# (CSharp) Method

        public IEnumerator GetEnumerator()
        {
            return items.GetEnumerator();
        }

        private static void DisableFormsForModalLoop(Queue toplevels, ApplicationContext context)
        {
            Form f;

            lock (forms)
            {
                IEnumerator control = forms.GetEnumerator();

                while (control.MoveNext())
                {
                    f = (Form)control.Current;

                    // Don't disable the main form.
                    if (f == context.MainForm)
                    {
                        continue;
                    }

                    // Don't disable any children of the main form.
                    // These do not have to be MDI children.
                    Control current          = f;
                    bool    is_child_of_main = false;;

                    do
                    {
                        if (current.Parent == context.MainForm)
                        {
                            is_child_of_main = true;
                            break;
                        }
                        current = current.Parent;
                    }while (current != null);

                    if (is_child_of_main)
                    {
                        continue;
                    }

                    // Disable the rest
                    if (f.IsHandleCreated && XplatUI.IsEnabled(f.Handle))
                    {
#if DebugRunLoop
                        Console.WriteLine("      Disabling form {0}", f);
#endif
                        XplatUI.EnableWindow(f.Handle, false);
                        toplevels.Enqueue(f);
                    }
                }
            }
        }