private void button1_Click(object sender, EventArgs e)
        {
            String username = "Oppel175";
            String password = "Cookie";

            if (Username.Text == username & Password.Text == password)
            {
                System.Windows.Forms.MessageBox.Show("Login successful");
            }
            if(Username.Text != username)
            {
                System.Windows.Forms.MessageBox.Show("Invalid Username");
            }
            if (Password.Text != password)
            {
                System.Windows.Forms.MessageBox.Show("Invalid Password");
            }

        }

        private void Username_TextChanged(object sender, EventArgs e)
        {

        }
    }
}