ListIn this example, we create a list of integers and then use the Single method to find a single even number from the list. The lambda expression `n => n % 2 == 0` is used as the condition to determine which element to return. Package library: NUnit (a unit testing framework for .NET)numbers = new List { 1, 2, 3, 4 }; int evenNumber = numbers.Single(n => n % 2 == 0);