ListIn this example, the `isEven` method is defined using a lambda expression, which is a concise way of writing anonymous methods. We then pass this method as an argument to the `Where` method, which filters the list based on the condition defined by the `isEven` method. Func is part of the System namespace in C#, which is included in the .NET Framework and .NET Core libraries.numbers = new List { 1, 2, 3, 4, 5, 6 }; Func isEven = (int n) => n % 2 == 0; var evenNumbers = numbers.Where(isEven).ToList(); // returns [2, 4, 6]