now i know. ty (Y)

Linq has been a part of C# since version 3. It is not a separate library. Using linq means you are writing functional code. If you are a beginner, you should try writing loops to understand programming but I would never use a loop to find an item in a collection in production code.

everytime i see solutions with using System.Linq;

try without it. sure it is easy with libs.. but sometimes you dont have the possibility