using static System.Console; public class Program { public static void Main() { var partes = "97A96D112A109X115T114H122D118Y128".Split("ABCDEFGHIJKLMNOPQRSTUVXWYZ".ToCharArray()); foreach (var item in partes) WriteLine(item); //só para confirmar que deu certo } } //https://pt.stackoverflow.com/q/209214/101