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Changing Case

To change the letters in a string to upper or lower case, use ToUpper() or ToLower(), like this:

string s6 = "Battle of Hastings, 1066";

System.Console.WriteLine(s6.ToUpper()); // outputs "BATTLE OF HASTINGS 1066"

System.Console.WriteLine(s6.ToLower()); // outputs "battle of hastings 1066"