What is the use of C# 'yield' keyword?

22.

Let the calling method resume control and call back later.

Signals to the compiler that the method in which it appears is an iterator block and the yield keyword is used together with the return keyword to provide a value to the enumerator object

Allows conditional branching within a method

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Used in an iterator block to provide a value to the enumerator object or to signal the end of iteration. It takes one of the following forms:

yield return [expression];
yield break;