Sort List like Excel columns sort

Question

Please consider this List:

\"A\", \"C\", \"AB\", \"AD\", \"N\", \"Z\", \"AC\"

I want to sort this string (That are being Excel column) like

Answer 1

First order by the length of column name ("C" comes before "AB"), then use normal alphabetical (string) sorting on strings with same length ("AC" before "AD").

var columns = new[] { "A", "C", "AB", "AD", "N", "Z", "AC" };
var sorted = columns.OrderBy(c => c.Length)
                    .ThenBy(c => c);