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        public interface MyDriver

        {

            string receiv();

            void send(string data);

        }

        public class FirstDriver : MyDriver

        {

            public string receiv()

            {

                return "This is first driver";

            }

            public void send(string data)

            {

                MessageBox.Show("Send data to first driver " + data);

            }

        }

        public class SecondDriver : MyDriver

        {

            public string receiv()

            {

                return "This is second driver";

            }

            public void send(string data)

            {

                MessageBox.Show("Send data to second driver " + data);

            }

        }

        private void btnStart_Click(object sender, EventArgs e)

        {

            list = new List<MyDriver>();

            list.Add(new FirstDriver());

            list.Add(new SecondDriver());

            label1.Text = list[0].receiv();

            label2.Text = list[1].receiv();

            list[0].send("Proba");

            list[1].send("Proba");

        }

        public class Proba

        {

            public string receiv()

            {

                return "This is proba class";

            }

            public void send(string data)

            {

                MessageBox.Show("Send data toproba class " + data);

            }

        }