public static Frm_RegistrationManager Instance(bool isOpen) { if (_instance == null || _instance.IsDisposed) { _instance = new Frm_RegistrationManager(); _instance.Show(); } if (isOpen) { _instance.BringToFront(); if (_instance.WindowState == FormWindowState.Minimized) { _instance.WindowState = FormWindowState.Normal; } } return(_instance); }