What is the Yield keyword and use of in C#?

-“Yield keyword helps us to do custom stateful iteration over .NET collections.”

• It moves control of the program to and from between caller and the collection.

-“Yield” keyword will return control to the caller, the caller will do his work and re-enter the function from where it had left and continue iteration from that point onwards.

-There are two scenarios where “yield” keyword is useful:-
Customized iteration through a collection without creating a temporary collection.
Stateful iteration.

-yield keyword indicates that the method, operator, or property in which it appears is an iterator.

-The yield keyword statement can be declared like yield return <;expression>; and yield break.

-The return type of yield must be an IEnumerable or IEnumerator object of values.

-The yield return or yield break statements are not allowed to be used in anonymous methods and in the methods that contain unsafe blocks.

-In c#, the yield return statement can be used in the try block of the try-finally statement.

-The yield break statement can be used in try or catch block but not in finally block.

-We can consume the iterator method that contains a yield return statement either by using a foreach loop or LINQ query.