private void btn_home_Click(object sender, EventArgs e)
        {
            PaitentMain pmain = new PaitentMain();

            pmain.Show();
            this.Hide();
        }
        private void btn_Patient_Click(object sender, EventArgs e)
        {
            string          connetionString = null;
            MySqlConnection con;

            connetionString = "server=localhost;database=hmsdb;Uid=root;Pwd=;";
            con             = new MySqlConnection(connetionString);
            con.Open();
            if (String.Compare(NA, "manager") == 0)
            {
                MessageBox.Show("YOU ARE NOT AUTHORIZED TO ACCESS THIS FUNCTION!!!");
            }
            else
            {
                PaitentMain pm = new PaitentMain();
                pm.Show();
                this.Hide();
            }
        }