using System; class MainClass { public static void Main() { string[] myStrings = {"To", "be", "or", "not","to", "be"}; string myString = String.Join(".", myStrings); string myString21 = myString.Substring(3); Console.WriteLine("myString.Substring(3) = " + myString21); string myString22 = myString.Substring(3, 2); Console.WriteLine("myString.Substring(3, 2) = " + myString22); string myString23 = myString.ToUpper(); Console.WriteLine("myString.ToUpper() = " + myString23); string myString24 = myString.ToLower(); Console.WriteLine("myString.ToLower() = " + myString24); } }