RollBack or Commit (enterprise library transaction) over classes when another class receives result in C #

I have a class that is a mirror of a table.

    public class Patient
    {
        public int Patient_id { get; set; }
        public string Name { get; set; }
        public string Address { get; set; }
        public bool Sex { get; set; }

        public Patient f_UpdatePatient(Patient _patient)
        {
            string QUpdate = "  UPDATE Patients "
                             + "   SET Name    = '" + _patient.Name + "'"
                             + "      ,Address = '" + _patient.Address + "'"
                             + "      ,Sex = " + (_patient.Sex ? "M" : "F")
                             + " WHERE patient_id = " + _patient.Patient_id;

            Database db1 = DatabaseFactory.CreateDatabase("cnnStr");
            DataSet ds = db1.ExecuteDataSet(CommandType.Text, QUpdate);

            // First, How can i set my instance which is coming as a parameter 
            // to my real object. Without passing each value to eac prop of obj.
            return this = _patient;
        }
    }

      

        
        
        
      

    

I have another class that uses Patient. Before using it, it sets new values ​​for one instance of the Patient class, so I can send the latest value to the web service. (Actually I need to write a db before I use a webservice which is not in my project)

    public class ServiceConnection
    {
        public static void Main(string[] args)
        {
            Patient pt = new Patient(12);

            // Just want to show that i need DB update.
            pt.Name = args[0];
            pt.Address = args[1];

            try
            {
                // Now i am connection web service and sending pt instance
                bool isOk = f_SendToService(pt);
            }
            catch (Exception ex)
            {
                // Now, at this point, I WANT TO ROLLBACK MY UPDATE with TRANSACTION 
                // or something else
                throw (ex);
            }
        }

        private static bool f_SendToService(Patient pt)
        {
            // trying to send. But sometimes, i get timeout errors
            // sometimes i get false result.
            throw new WebException("Sorry it couldn't reach to WS");
        }
    }

      

        
        
        
      

    

If I get an exception or false result, do you have any suggestions for me on how I can handle this?

I want to use TRANSACTION (because I don't want to set the same line again), but HOW?

Thanks for the consultation...