Answer / banaja

public class ExampleIterator : IEnumerable {
public IEnumerator GetEnumerator() {
yield return 1;
}
}

The class ExampleIterator implements the IEnumerable
interface, which requires the GetEnumerator method to be
implemented. The GetEnumerator method returns an
IEnumerator instance. In the implementation of
GetEnumerator, the value 1 is returned rather than an
IEnumerator interface instance. This is odd, because how
can a value type be returned when a reference type is
expected? The magic is the yield keyword, which provides
the missing code in the form of generated IL.

The yield keyword is a compiler directive that generates a
very large chunk of IL code. Using ILDASM.exe it is
possible to reverse engineer what the compiler generated

Answer / puneet meena

while(get_next_record_from_database)
{ yield return your_next_record;}

It allows you to quickly create an object collection (an Enumerator) that you can loop through and retrieve records. The yield return statement handles all the of the code needed to create an enumerator for you.

The big part of the yield return statement is that you don't have to load all the of the items in a collection before returning the collection to the calling method. It allows lazy loading of the collection, so you don't pay the access penalty all at once.

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