public void updateSalesPerson(SalesPerson sp)
        {
            string query = "UPDATE salesperson SET name='" + sp.getName() + "',commission='" + sp.getCommission() + "',address='" + sp.getAddress() + "' WHERE sid='" + sp.getSId() + "'";

            if (this.connect())
            {
                MySqlCommand cmd = new MySqlCommand(query, connection);
                cmd.ExecuteNonQuery();
                query           = "UPDATE employees SET id='" + sp.getEmpId() + "',sid='" + sp.getSId() + "',password='******' WHERE sid='" + sp.getSId() + "'";
                cmd.CommandText = query;
                cmd.ExecuteNonQuery();
            }

            this.stopConnection();
        }
        public void addSalesPerson(SalesPerson sp)
        {
            if (this.connect())
            {
                string       query = "INSERT INTO salesperson (name,commission,address) VALUES ('" + sp.getName() + "','" + sp.getCommission() + "','" + sp.getAddress() + "')";
                MySqlCommand cmd   = new MySqlCommand(query, connection);
                cmd.ExecuteNonQuery();

                query = "SELECT sid FROM salesperson WHERE name = " + sp.getName() + ";";
                cmd   = new MySqlCommand(query, connection);
                MySqlDataReader reader = cmd.ExecuteReader();
                sp.setSId(reader.GetInt32(0));

                query = "INSERT INTO employees (id,password,sid) VALUES ('" + sp.getEmpId() + "','" + sp.getPassword() + "','" + sp.getSId() + "')";
                cmd   = new MySqlCommand(query, connection);
                cmd.ExecuteNonQuery();

                reader.Close();
            }

            this.stopConnection();
        }