string letters = "abcdefghijklmabcdefghijklm";
string output = "";
output += "'c' is located at index " + letters.IndexOf( 'c' );
utput += "\n'a' is located at index " + letters.IndexOf( 'a', 1 );
output += "\n'$' is located at index " +letters.IndexOf( '$', 3, 5 );
System.Console.WriteLine(output);
