private void btn_back_Click(object sender, EventArgs e)
{
this.Close();
Home_Form home = new Home_Form();
home.Show();
}
// timer for clicking login button, if successful will take user to main content page
private void timer_login_Tick(object sender, EventArgs e)
{
this.Hide();
Home_Form home = new Home_Form();
home.Show();
timer_login.Enabled = false;
// clear controls
textBox_username.Text = null;
textBox_password.Text = null;
label_welcome.Hide();
metro_spinner.Hide();
btn_exit.Show();
}