Design and Architecture

// Here is an exemple shows that the important of length of Method.
        public void RunSome()
        {
            try
            {
                if (!PrepareEngin()) throw new Exception("No usable engin");
                if (DoWeHaveAnCat())
                {
                    PlayWithCat();
                }
                else if (GoToBuyAnCat())
                {
                    RunSome();
                }
            }
            catch (Exception exp)
            {
                throw exp;
            }
        }

        private bool PrepareEngin()
        {
            // Some code here
            return true;
        }

        private bool DoWeHaveAnCat()
        {
            // Some code here
            return true;
        }

        private void PlayWithCat()
        {
            // Some code here
        }

        private bool GoToBuyAnCat()
        {
            // Some code here
            return true;
        } 

public class Person
    {
        protected string ssn = "444-55-6666";
        protected string name = "John L. Malgraine";

        public virtual void GetInfo()
        {
            Console.WriteLine("Name: {0}", name);
            Console.WriteLine("SSN: {0}", ssn);
        }
    }
    class Employee : Person
    {
        public string id = "ABC567EFG";
        public override void GetInfo()
        {
            // Calling the base class GetInfo method: 
            base.GetInfo();
            Console.WriteLine("Employee ID: {0}", id);
        }
    }
//---------------------------------------------------------
    public abstract class animal
    {
        protected string ssn = "Poultry";
        protected string name = "Mostly flying creatures";

        public abstract void GetInfo();
    }
    class Seagull : animal
    {
        public string id = "ABC567EFG";
        public override void GetInfo()
        {
            // Calling the base class GetInfo method: 
            Console.WriteLine("Name: {0}", name);
            Console.WriteLine("SSN: {0}", ssn);
            Console.WriteLine("Specimen ID: {0}", id);
        }
    }

Public class A2Implementation {

 public A2Implementation()
        {
 // This is base class access  of the getinfo() method
            Employee E = new Employee();
            E.GetInfo();
            // The following is abstract class access of the getinfo() method
            // animal A = new animal();   // this would be wrong (instantiating it) instead, (if I were to use this) use a derive-keyword on this implementing class
            Seagull A = new Seagull();
            A.GetInfo(); // getinfo() is accessed through the Seagull class
}