private void adminSettingToolStripMenuItem_Click(object sender, EventArgs e)
 {
     this.Hide();
     auth = new AuthanticationForm();
     auth.Show();
 }
        private void MainApps_KeyDown(object sender, KeyEventArgs e)
        {
            if(e.Control && e.KeyCode.ToString().ToUpper() == "A")
            {
                if (auth != null && !auth.IsDisposed)
                {

                    //Daha önce form yaratıldıysa
                    //Exception'a düşüyor(du) !
                    auth.Show();
                }
                else
                {
                    auth = new AuthanticationForm();
                    auth.Show();
                    this.Hide();
                }
            }
        }