static void Main()
{
Customer C1 = new Customer();
C1.Customer2Print();
C1.Customer3Print();
C1.Customer1Print();
ICustomer2 IC2 = new Customer();
IC2.Customer2Print(); // Only ICustomer2 member available.
Program P = new Program();
((I1)P).InterfaceMethod(); //As the method names in both the interface us same. InterfaceMethod() cannot be called on Program object.
((I2)P).InterfaceMethod();
/* OR */
I1 i1 = new Program();
I2 i2 = new Program();
i1.InterfaceMethod();
i2.InterfaceMethod();
/* OR */
I1 ii1 = new Program();
I2 ii2 = (Program)ii1; //may not be a good practice in actual, but depends.
ii1.InterfaceMethod();
ii2.InterfaceMethod();
Console.ReadKey();
}