private void trởVềĐăngNhậpToolStripMenuItem_Click(object sender, EventArgs e) { this.Close(); frmDangnhap ss1 = new frmDangnhap(); ss1.Show(); }
private void thoátToolStripMenuItem_Click(object sender, EventArgs e) { this.Close(); frmDangnhap f = new frmDangnhap(); f.StartPosition = FormStartPosition.CenterScreen; f.Show(); }