Exemple #1
0
 public static frmHoaDon GetInstance()
 {
     if (instance == null)
     {
         instance = new frmHoaDon();
     }
     return(instance);
 }
Exemple #2
0
        private void hóaĐơnToolStripMenuItem_Click(object sender, EventArgs e)
        {
            frmHoaDon HD = new frmHoaDon();

            HD.ShowDialog();
        }