Question

How do I fix this function so that I can input a List of any class

private static List<Type> CopyObjList(List<Type> Group, List<Type> AddGroup)
{
    foreach (Type obj in AddGroup)
        Group.Add(obj);
    return Group;
}

Answer 1

Generics and AddRange

private static void CopyObjList<T>(List<T> Group, List<T> AddGroup)
{
      Group.AddRange(AddGroup);
}

Return type is not mendatory since List is a reference type.

Have a nice day