using System; using System.Collections.Generic; class Example { static void Main() { IEnumerable‹int› ienum = OddSequence(50, 110); Console.WriteLine("Retrieved enumerator..."); foreach (var i in ienum) { Console.Write($"{i} "); } } public static IEnumerable‹int› OddSequence(int start, int end) { if (start < 0 || start > 99) throw new ArgumentOutOfRangeException("start must be between 0 and 99."); if (end > 100) throw new ArgumentOutOfRangeException("end must be less than or equal to 100."); if (start >= end) throw new ArgumentException("start must be less than end."); for (int i = start; i <= end; i++) { if (i % 2 == 1) yield return i; } } } // The example displays the following output: // Retrieved enumerator... // // Unhandled Exception: System.ArgumentOutOfRangeException: // Specified argument was out of the range of valid values. // Parameter name: end must be less than or equal to 100. // at Sequence.‹GetNumericRange›d__1.MoveNext() in Program.cs:line 23 // at Example.Main() in Program.cs:line 43