private void button3_Click(object sender, EventArgs e)
{
tuitons Tuition = new tuitons();
this.Hide();
Tuition.ShowDialog();
this.Close();
}
private void button3_Click(object sender, EventArgs e)
{
button1.BackColor = Color.DarkSlateGray;
button2.BackColor = Color.DarkSlateGray;
button3.BackColor = Color.Blue;
button5.BackColor = Color.DarkSlateGray;
button7.BackColor = Color.DarkSlateGray;
button8.BackColor = Color.DarkSlateGray;
tuitons Tuitions = new tuitons();
this.Hide();
Tuitions.ShowDialog();
this.Close();
}