private void button1_Click(object sender, EventArgs e)
{
subjectObject.Notify();
string PersonCode = textBox1.Text;
string Password = textBox2.Text;
IPerson personOnline = businessManager.Authentication(PersonCode, Password);
textBox2.Text = string.Empty;
if (personOnline is Alumnus)
{
textBox1.Text = string.Empty;
new Form3().ShowDialog();
}
else if (personOnline is Employee)
{
textBox1.Text = string.Empty;
new Form4().ShowDialog();
}
else
{
MessageBox.Show("Invalid UserName or Password");
}
businessManager = new BusinessManager();
}