private void button1_Click(object sender, EventArgs e)
{
if (radioButton1.Checked)
{
login lg = new login();
lg.Show();
}
else if (radioButton2.Checked)
{
Signup su = new Signup();
su.Show();
}
else if (rbtn_chngpasssword.Checked)
{
change_password cp = new change_password();
cp.Show();
}
}