editor to quickly test code?

Question

User1655654435 posted

Hi, i'm looking for a program or editor where i can write some c# and/or asp.net core to test if something works without having to run my app each time or create a console app. 

for example if i want to test some calculations on a list, or conversions on some type.

Any opinions or tips on what is the best tool that exist that are free to do this in?

thankyou!