Framework: supporto per tipo char

using System;

namespace framework_base_A
{
  class Program
  {
    static void Main(string[] args)
    {
      string[] cognomi = { "rossi", "Verdi", "bianchi", "gialli" };

      //char.ToLower(c) e char.ToUpper(c)
     for (int i = 0; i < cognomi.Length; i++)
      {
        //cognomi[i][0] = char.ToUpper(cognomi[i][0]); NO, le string sono IMMUTABLE
        if (char.IsLower(cognomi[i][0]))
          cognomi[i] = char.ToUpper(cognomi[i][0]) + cognomi[i].Substring(1);

        Console.WriteLine(cognomi[i]);
      }

      string s = "Rossi, Mario";
      Console.WriteLine($"{ char.IsLower(s[0])} {char.IsPunctuation(s[5])} {char.IsWhiteSpace(s[6])}");

      Console.WriteLine(char.GetUnicodeCategory('!'));

      char c = 'z';
      if (char.ToUpper(c) == 'Z') { }

    }
  }
}