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Compiler Error CS1622

Cannot return a value from an iterator. Use the yield return statement to return a value, or yield break to end the iteration.

An iterator is a special function that returns a value via the yield statement rather than the return statement. For more information, see iterators.

The following sample generates CS1622:

// CS1622.cs
// compile with: /target:library
using System.Collections;

class C : IEnumerable
   public IEnumerator GetEnumerator()
      return (IEnumerator) this;  // CS1622
      yield return this;   // OK