private void inDanhSáchThuLệPhíToolStripMenuItem_Click(object sender, EventArgs e) { if (!CheckExitsFrom("FrmDsThuLePhi")) { FrmDsThuLePhi fm = new FrmDsThuLePhi(); fm.MdiParent = this; fm.Show(); } else ActiveChildForm("FrmDsThuLePhi"); }
private void button4_Click(object sender, EventArgs e) { FrmDsThuLePhi f = new FrmDsThuLePhi(); f.Show(); }