Answer Posted / prem

An iterator is invoked from client code by using a foreach
statement.
An iterator is a section of code that returns an ordered
sequence of values of the same type.

An iterator can be used as the body of a method, an
operator, or a get accessor.

The iterator code uses the yield return statement to return
each element in turn. yield break ends the iteration
EXAMPLE
.............................................................
public class DaysOfTheWeek : System.Collections.IEnumerable
{
string[] days = { "Sun", "Mon", "Tue", "Wed", "Thr",
"Fri", "Sat" };

public System.Collections.IEnumerator GetEnumerator()
{
for (int i = 0; i < days.Length; i++)
{
yield return days[i];
}
}
}

class TestDaysOfTheWeek
{
static void Main()
{
// Create an instance of the collection class
DaysOfTheWeek week = new DaysOfTheWeek();

// Iterate with foreach
foreach (string day in week)
{
System.Console.Write(day + " ");
}
}
}
// Output: Sun Mon Tue Wed Thr Fri Sat

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