C# What does List<List<string>> mean?

Question

What is List<List<string>> and how do I get the data out (as Strings)?

Answer 1

It's a list of lists of strings. Each element of the "outer" list is a list of strings. The simplest way to "flatten" the list is to use LINQ:

var flattened = listOfLists.SelectMany(list => list);

foreach (var value in flattened)
{
    Console.WriteLine(value);
}