List<string> list = new List<string> { "..." };
foreach (var item in list)
{
    Console.WriteLine(item);
}

List<string> list = new List<string> { "..." };
using (List<string>.Enumerator enumerator = list.GetEnumerator())
{
    while (enumerator.MoveNext())
    {
        string item = enumerator.Current;
        Console.WriteLine(item);
    }
}

IEnumerable<string> list = new List<string> { "..." };
foreach (var item in list)
{
    Console.WriteLine(item);
}

using (IEnumerator<string> enumerator = list.GetEnumerator())