C# Error no BigInteger namesapypce found

Question

I was hoping to use the BigInteger type in some code, however the BigInteger namespace could not be found, despite me using the correct System.Numerics namespace. If this is a question of the compiler being outdated, I hope in the future it could be updated.
I know that there have been other posts but other value types are too small for what I am attempting to implement.
Thanks for any help!

Answer 1

To use BigInteger you need to add a link to the System.Numerics.dll library. And only after that you can use the System.Numerics namespace.

Answer 2

And may I ask if that is possible in SoloLearn