using System; using System.Collections.Generic; using System.Linq; using System.Text; public class CaseInsensitiveComparer : IComparer<string> { public int Compare(string x, string y) { return string.Compare(x, y, true); } } public class MainClass { public static void Main() { string[] words = { "a", "A", "b", "B", "C", "c" }; var sortedWords = words.OrderBy(a => a, new CaseInsensitiveComparer()); } }