> For the complete documentation index, see [llms.txt](https://andreyakinshin.gitbook.io/problembookdotnet/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://andreyakinshin.gitbook.io/problembookdotnet/en/linq/yieldexceptionyield-p.md).

# “YieldExceptionYield” (Problem)

At what point will happen `Exception`?

```csharp
public static IEnumerable<int> GetSmallNumbers()
{
  yield return 1;
  throw new Exception();
  yield return 2;
}
void Main()
{
  var numbers = GetSmallNumbers();
  var evenNumbers = numbers.Select(n => n * 2);
  Console.WriteLine(evenNumbers.FirstOrDefault());
}
```

[Solution](/problembookdotnet/en/linq/yieldexceptionyield-s.md)