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<@U03K67XQM6Z> you need to do the `File.WriteAllText` inside the `Apply` so that the value has resolved

see <https://leebriggs.co.uk/blog/2021/05/09/pulumi-apply> for a different way of explaining iut

right now you're assigning the variable inside the apply, you need to do the entire operation inside it

image.png

<@UCWG26BH7> Thank you! I tried that but couldn't get it to compile, because File.WriteAllText doesn't return a string:

you can change the `Apply` to return a string, but still do some stuff inside the apply, right?

I'm very weak in C# so can't fix it for you

I could do something like this:
```env.Id.Apply(v =&gt; { File.WriteAllText(@"env-id.txt", $"env-id = {v}"); return string.Empty; });```