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Primary: 8.8.8.8
Secondary: 8.8.4.4
1: var daysOfWeek = new[] { "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday" }; 2: var workDays = daysOfWeek.Except( new []{ "SUNDAY", "SaTURdaY"}); // Performs a case sensitive search and yields Sunday,Monday - Saturday. 3: workDays = daysOfWeek.Except(new[] { "SUNDAY", "SaTURdaY" },StringComparer.OrdinalIgn... // Performs a case insensitive search and yields Monday-Friday The except operator takes a comparer that tells it how to evaluate the two lists. Nice one ......