Listnumbers = new List { 1, 2, 3, 4 }; numbers.Clear(); // Clear all elements in the list
HashSetnames = new HashSet { "Alice", "Bob", "Charlie" }; names.Clear(); // Clear all elements in the hashset
Dictionaryscores = new Dictionary { { "Alice", 90 }, { "Bob", 80 }, { "Charlie", 70 } }; scores.Clear(); // Clear all elements in the dictionary
var people = new[] { new { Name = "Alice", Age = 30 }, new { Name = "Bob", Age = 25 }, new { Name = "Charlie", Age = 35 } }; var groupedPeople = people.GroupBy(p => p.Age); foreach (var group in groupedPeople) { group.Clear(); // Clear all elements in each group }In all of these examples, the `Clear` method is used to remove all the elements from a collection or group. The package library for these methods depends on the specific collection or group being used, but they all belong to the standard .NET libraries.