using System; class MainClass { public static void Main() { string str1 = "ABCDEabcde1234567890"; string strLow = str1.ToLower(); string strUp = str1.ToUpper(); Console.WriteLine("Lowercase version of str1:\n " + strLow); Console.WriteLine("Uppercase version of str1:\n " + strUp); } }
Lowercase version of str1: abcdeabcde1234567890 Uppercase version of str1: ABCDEABCDE1234567890