private void pictureBox1_Click(object sender, EventArgs e) { frmHoaDon frm = new frmHoaDon(); frm.Show(); this.Close(); }
private void quảnLýHóaĐơnToolStripMenuItem_Click(object sender, EventArgs e) { frmHoaDon frm = new frmHoaDon(); if (OpenAForm(frm)) { frm.Show(); } }