How do I change my new list without changing the original list?

Question

I have a list that gets filled in with some data from an operation and I am storing it in the memory cache. Now I want another list which contains some sub data from the li

Answer 1

You need to clone your list in your method, because List is a class, so it's reference-type and is passed by reference.

For example:

List SomeOperationFunction(List target)
{
  List tmp = target.ToList();
  tmp.RemoveAt(3);
  return tmp;
}

Or

List SomeOperationFunction(List target)
{
  List tmp = new List(target);
  tmp.RemoveAt(3);
  return tmp;
}

or

List SomeOperationFunction(List target)
{
  List tmp = new List();
  tmp.AddRange(target);
  tmp.RemoveAt(3);
  return tmp;
}