I have noticed that item 5) [while still immensely useful] might be obsolete given the advent of Covariance and Contravariance of generic type parameters in C# 4.0.


// A collection declared to contain elements of a derived type, Spoon.
List<Spoon> spoonList = new List<Spoon> { ... };
// A distribution station handling any IUtensil type
IFacility<IUtensil> facility = new CanteenFacility<IUtensil>();
facility.Distribute(spoonList);


namespace CALINQ1
{
class clsemployee5
{
public int pempid
{set; get;}

public string pename
{set;get;}

public string pdesignation
{set;get;}

public DateTime pdoj
{set;get;}

public Double psal
{set;get;}

public int deptno
{set;get;}
}
class clsemployee14
{
static void Main(string[] args)
{
List emplist = new List()
{
new clsemployee5{pempid=101,pename=”shiva”,pdesignation=”ceo”,pdoj=23/07/1981,psal=10000,deptno=10}
};
Console.WriteLine(“employee list is:-”);
foreach(var i in emplist)
Console.WriteLine(i.pempid+” “+i.pename+” “+i.pdesignation+” “+i.pdoj+” “+i.psal+” “+i.deptno);
Console.Read();
}
}
}